Rinnai · Error codes
Rinnai error codes and alerts
Identical code numbers can mean different things on different controllers, so every entry is tied to the documented series, controller and manual version. A code is never a diagnosis.
If you smell gas
- Stop what you are doing. Do not use phones, switches, matches or anything that can spark inside.
- Go outside and leave the door open behind you.
- Call the FortisBC 24-hour emergency line at 1-800-663-9911 or dial 911.
Only after that, call ROMA about the boiler. Official guidance: FortisBC gas leaks and odour.
Rinnai i-Series+ combi boilers up to 150K BTU (front-panel diagnostics, manual 800000190)
021
Too Long DHW Continuous Operation. The code appears when DHW is used beyond the maximum continuous operating time set by parameter 18. The t…
Details
100
Air Supply or Exhaust Blockage/Condensate Trap is Full. Air supply or exhaust blockage or a full condensate trap can cause a fan current ini…
Details
110
No Ignition (Unit Not Turning On). The unit is not turning on due to an ignition error, so the gas supply, flame rod, igniter, and venting s…
Lockout
120
Flame Failure. The boiler has flame failure, so check the gas supply, venting, flame rod connection, and gas type and inlet pressure.…
Lockout
140
Heat Exchanger Overheat. The overheat switch has tripped, so check for scale buildup, pump lockup, closed CH valves, and freezing conditions…
Details
150
Venturi Control. A venturi operation error has occurred, so ensure the venturi motor operates correctly or replace the gas valve assembly.…
Details
161
High Outgoing Temperature. A safety shutdown occurred because the DHW outgoing temperature is too hot.…
Details
170
Venturi Blockage. The venturi and silencer may be blocked, so check the condensate drain and venting connections before resetting the error.…
Details
180
Gas Valve Adjustment Limit. Verify that the gas type and gas type parameter are correct, and contact Rinnai Technical Support if needed.…
Details
190
Electrical Grounding. A secondary circuit ground fault has occurred, so check all electrical components for an electrical short.…
Details
210
Data Transfer Error. If the PCB has been replaced, ensure the data transfer process is complete to clear this error.…
Details
220
Gas Valve Adjustment. Ensure that a Reed switch is located properly and that the gas valve adjustment is operating correctly.…
Details
250
Condensate Pump (Accessory). The boiler will operate for 60 seconds, so confirm the wire connections and that the condensate reservoir is em…
Details
303
Secondary Thermistor. Ensure Parameter 70 enables the secondary thermistor, then check its wiring and resistance and replace the sensor if n…
Details
310
Freeze Protection Thermistor. Check the freeze protection thermistor wiring for damage, measure its resistance, and replace the sensor if ne…
Details
321
Outgoing Thermistor. Check the outgoing thermistor wiring for damage, clean off any scale buildup, measure resistance, and replace the senso…
Details
331
Heat Exchanger Thermistor. Check the heat exchanger thermistor wiring for damage, measure the sensor resistance, and replace the sensor if n…
Details
341
Inlet Thermistor. Check the inlet thermistor wiring for damage, measure the sensor resistance, and replace the sensor if necessary. The tabl…
Details
353
Supply Thermistor. Check the supply thermistor wiring and sensor resistance, clean its surface, and check the return thermistor as well.…
Details
363
Return Thermistor. Check the return thermistor wiring for damage, measure the sensor resistance, and replace the sensor if necessary.…
Details
380
Exhaust Thermistor. Check the exhaust thermistor wiring and sensor resistance, clean its surface, and check the return thermistor if needed.…
Details
393
Outdoor Thermistor. Ensure parameter number 00 is set appropriately, then check the outdoor thermistor wiring and measure its resistance.…
Details
400
Pressure Sensor. Check the pressure sensor wiring for damage, measure the sensor voltage, and replace the sensor if necessary.…
Details
430
High/Low Water Pressure. If system water pressure is too low add water until at least 13 PSI, or adjust it down to a maximum of 30 PSI if to…
Details
443
Low Water Cut-Off (LWCO). Ensure the LWCO device works correctly, its jumper is connected when the LWCO is not in use, and the output is 24 …
Details
520
Solenoid Valve Circuit. Check the flame rod and its wire for damage, close the gas shut off valve, and check the PC Board output to the sole…
Lockout
540
High Exhaust Temperature. Make sure the boiler pump activates during operation and check the exhaust thermistor wiring, since exhaust temper…
Details
610
Combustion Fan. Check the combustion fan motor wire harness for loose or damaged connections, measure its resistance and voltage, and confir…
Details
631
DHW Recirculation Pump. Ensure the DHW recirculation pump matches parameter 12, the return line and filters are clean, and the pump connects…
Details
651
Water Flow Control. Measure the resistance values and voltage of the water flow control and ensure the harness and connector are not wet. Th…
Details
661
By-Pass. Measure the resistance values and voltage of the bypass servo valve and ensure its harness and connector are not wet. The table cla…
Details
670
3-Way Valves. Check the CH system water quality, measure the resistance and voltage of the 3-way valve control, and replace the device if ne…
Details
681
Hot Water Supply Temperature Abnormality. The DHW water temperature is higher than the set point because the bypass servo fails to close, so…
Details
700
PC Board. A PC Board circuit error has occurred, so the PC Board must be replaced.…
Details
710
Solenoid Valve Circuit. Ensure dip switch 5 is in the OFF position and the gas control wire and heater circuit are sound, then replace the P…
Details
720
Flame Rod. Check the flame rod and its wire for damage or moisture, and replace the PC Board if no issue is found with them.…
Lockout
763
0-10V Input. A 0-10V input overrange was detected, so check the settings of the external controller.…
Details
890
Freeze Issue. The boiler checks the heat exchanger temperature at operation, and if it is too low an error occurs, so check the boiler and C…
Details
LC
Scale Buildup in Heat Exchanger. Scale buildup in the heat exchanger requires flushing the DHW plate heat exchanger, and the LC code resets …
Details
FFF
Maintenance Indicator. This code is a placeholder in the diagnostic code history indicating a service provider performed maintenance or serv…
Details
SS
Service Soon (SS). Service Soon is a time-based service indicator set during installation, and it resets by pressing the Central Heating but…
Details
SE
Secondary Unit Error for Cascade System. This code indicates a secondary unit error for a cascade system.…
Details
Rinnai i-Series+ solo boilers up to 150K BTU (front-panel diagnostics, manual 800000191)
100
Air Supply or Exhaust Blockage/Condensate Trap is Full. Air supply or exhaust blockage or a full condensate trap can cause a fan current ini…
Details
110
No Ignition (Unit Not Turning On). The unit is not turning on due to an ignition error, so the gas supply, flame rod, igniter, and venting s…
Lockout
120
Flame Failure. The boiler has flame failure, so check the gas supply, venting, flame rod connection, and gas type and inlet pressure.…
Lockout
140
Heat Exchanger Overheat. The overheat switch has tripped, so check for scale buildup, pump lockup, closed CH valves, and freezing conditions…
Details
150
Venturi Control. A venturi operation error has occurred, so ensure the venturi motor operates correctly or replace the gas valve assembly.…
Details
161
High Outgoing Temperature. A safety shutdown occurred because the DHW outgoing temperature is too hot.…
Details
170
Venturi Blockage. The venturi and silencer may be blocked, so check the condensate drain and venting connections before resetting the error.…
Details
180
Gas Valve Adjustment Limit. Verify that the gas type and gas type parameter are correct, and contact Rinnai Technical Support if needed.…
Details
190
Electrical Grounding. A secondary circuit ground fault has occurred, so check all electrical components for an electrical short.…
Details
210
Data Transfer Error. If the PCB has been replaced, ensure the data transfer process is complete to clear this error.…
Details
220
Gas Valve Adjustment. Ensure that a Reed switch is located properly and that the gas valve adjustment is operating correctly.…
Details
250
Condensate Pump (Accessory). The boiler will operate for 60 seconds, so confirm the wire connections and that the condensate reservoir is em…
Details
303
Secondary Thermistor. Ensure Parameter 70 enables the secondary thermistor, then check its wiring and resistance and replace the sensor if n…
Details
310
Freeze Protection Thermistor. Check the freeze protection thermistor wiring for damage, measure its resistance, and replace the sensor if ne…
Details
353
Supply Thermistor. Check the supply thermistor wiring and sensor resistance, clean its surface, and check the return thermistor as well.…
Details
363
Return Thermistor. Check the return thermistor wiring for damage, measure the sensor resistance, and replace the sensor if necessary.…
Details
371
Indirect Thermistor. Check the indirect thermistor wiring for damage and confirm the thermistor usage setting, then measure the sensor resis…
Details
380
Exhaust Thermistor. Check the exhaust thermistor wiring and sensor resistance, clean its surface, and check the return thermistor if needed.…
Details
393
Outdoor Thermistor. Ensure parameter number 00 is set appropriately, then check the outdoor thermistor wiring and measure its resistance.…
Details
400
Pressure Sensor. Check the pressure sensor wiring for damage, measure the sensor voltage, and replace the sensor if necessary.…
Details
430
High/Low Water Pressure. If system water pressure is too low add water until at least 13 PSI, or adjust it down to a maximum of 30 PSI if to…
Details
443
Low Water Cut-Off (LWCO). Ensure the LWCO device works correctly, its jumper is connected when the LWCO is not in use, and the output is 24 …
Details
520
Solenoid Valve Circuit. Check the flame rod and its wire for damage, close the gas shut off valve, and check the PC Board output to the sole…
Lockout
540
High Exhaust Temperature. Make sure the boiler pump activates during operation and check the exhaust thermistor wiring, since exhaust temper…
Details
610
Combustion Fan. Check the combustion fan motor wire harness for loose or damaged connections, measure its resistance and voltage, and confir…
Details
700
PC Board. A PC Board circuit error has occurred, so the PC Board must be replaced.…
Details
710
Solenoid Valve Circuit. Ensure dip switch 5 is in the OFF position and the gas control wire and heater circuit are sound, then replace the P…
Details
720
Flame Rod. Check the flame rod and its wire for damage or moisture, and replace the PC Board if no issue is found with them.…
Lockout
763
0-10V Input. A 0-10V input overrange was detected, so check the settings of the external controller.…
Details
831
Indirect Tank Temperature. The indirect tank has run for more than twelve hours without cycling off, so check the tank size, thermistor loca…
Details
890
Freeze Issue. The boiler checks the heat exchanger temperature at operation, and if it is too low an error occurs, so check the boiler and C…
Details
FFF
Maintenance Indicator. This code is a placeholder in the diagnostic code history indicating a service provider performed maintenance or serv…
Details
SS
Service Soon (SS). Service Soon is a time-based service indicator set during installation, and it resets by pressing the Central Heating but…
Details
SE
Secondary Unit Error for Cascade System. This code indicates a secondary unit error for a cascade system.…
Details
Rinnai i-Series+ combi boilers 175K–199K BTU (front-panel diagnostics, 175/199 manual)
021
Too Long DHW Continuous Operation. Using DHW beyond maximum continuous operating time by parameter i8 setting.…
Details
100
Air Supply or Exhaust Blockage/Condensate Trap is Full. Air supply or exhaust blockage or a full condensate trap can cause a fan current ini…
Details
120
Flame Failure. The boiler has flame failure, so check that the gas is turned on, ensure the flame rod wire is connected, and check flame rod…
Lockout
140
Heat Exchanger Overheat. The overheat switch is tripped, so measure the resistance of the overheat switch and check the heat exchanger surfa…
Details
150
Venturi Control. A venturi operation error has occurred, so ensure the venturi motor is operating correctly and replace the gas valve assemb…
Details
210
Data Transfer Error. If the PCB has been replaced, ensure the data transfer process is complete.…
Details
250
Condensate Pump (Accessory). Confirm the wire connections and harnesses are good and ensure the condensate reservoir is empty and the conden…
Details
303
Secondary Thermistor. Check the sensor wiring for damage, measure the resistance of the sensor, and replace the sensor if necessary.…
Details
321
Outgoing Thermistor. Check the sensor wiring for damage, clean the sensor of any scale buildup, measure the resistance of the sensor, and re…
Details
331
Heat Exchanger Thermistor. Check the sensor wiring for damage, measure the resistance of the sensor, and replace the sensor if necessary. Th…
Details
353
Supply Thermistor. Check the sensor wiring for damage, clean the surface of the sensor, measure the resistance of the sensor, and check the …
Details
380
Exhaust Thermistor. Check the sensor wiring for damage, clean the surface of the sensor, measure the resistance of the sensor, and check the…
Details
393
Outdoor Thermistor. Check the sensor wiring for damage, measure the resistance of the sensor, and replace the sensor if necessary.…
Details
400
Pressure Sensor. Check the sensor wiring for damage, measure the voltage of the sensor, and replace the sensor if necessary.…
Details
430
High/Low Water Pressure. If the water pressure is too low, add water into the system until at least 13 PSI is observed, and if the pressure …
Details
443
Low Water Cut-Off (LWCO). Ensure the LWCO device is working correctly, ensure the LWCO jumper is connected properly when LWCO is not in use,…
Details
520
Solenoid Valve Circuit. Check the flame rod and wire for damage, close the gas shut off valve installed near the boiler, and ensure the flam…
Lockout
540
High Exhaust Temperature. Make sure the boiler pump activates during operation, check the exhaust thermistor wiring for damage, and clean th…
Details
631
DHW Recirculation Pump. Ensure the dedicated return line is properly installed, the inlet water filter and bypass filter are clean and free …
Details
650
Water Flow Control. Measure the resistance values and voltage of the water flow control, ensure the harness and connector are not wet, and r…
Details
670
3-Way Valves. Check the CH system water quality, measure the resistance values and voltage of the 3-way valve control, and replace the 3-way…
Details
700
PC Board. A PC Board circuit error has occurred, so the PC Board must be replaced.…
Details
720
Flame Rod. Check the flame rod and wire for damage, ensure the flame rod and wire are not wet, and replace the PC Board if there is no issue…
Lockout
763
0-10V Input. 0-10V input overrange detection has occurred, so check the settings of the external controller.…
Details
890
Freeze Issue. The boiler checks the heat exchanger temperature at the time of operation, and if the temperature is too low, an error will oc…
Details
LC
Scale Buildup in Heat Exchanger. Flush the DHW plate heat exchanger, and the LC code will reset automatically when scaling is removed. The t…
Details
FFF
Maintenance Indicator. This code is a placeholder in diagnostic code history indicating a service provider performed maintenance or service.…
Details
55
Service Soon. Service Soon is a time-based service indicator set during installation, and to reset the 55 code, press the Central Heating bu…
Details
Rinnai i-Series+ solo boilers 175K–199K BTU (front-panel diagnostics, 175/199 manual)
100
Air Supply or Exhaust Blockage/Condensate Trap is Full. A fan current initial check error has occurred, so ensure the condensate line and tr…
Details
120
Flame Failure. The boiler has flame failure, so check that the gas is turned on at the boiler, gas meter, or propane cylinder, and ensure th…
Lockout
140
Heat Exchanger Overheat. The overheat switch is tripped, so measure its resistance and check the heat exchanger surface for hot spots which …
Details
150
Venturi Control. A venturi operation error has occurred, so ensure the venturi motor is operating correctly and replace the gas valve assemb…
Details
170
Venturi Blockage. Check the venturi and silencer for blockage, and before resetting this error check if the condensate drain is blocked or t…
Details
190
Electrical Grounding. A secondary circuit ground fault has occurred, so check all electrical components for an electrical short.…
Details
250
Condensate Pump (Accessory). The boiler will operate for 60 seconds, so confirm the wire connections and harnesses are good and the condensa…
Details
303
Secondary Thermistor. Ensure that Parameter 70 is set to be available, check the sensor wiring for damage, and measure the resistance of the…
Details
310
Freeze Protection Thermistor. Check the sensor wiring for damage, measure the resistance of the sensor, and replace the sensor if necessary.…
Details
353
Supply Thermistor. Clean the surface of the sensor, measure the resistance of the sensor, and check the return thermistor before replacing i…
Details
363
Return Thermistor. Check the sensor wiring for damage, measure the resistance of the sensor, and replace the sensor if necessary.…
Details
371
Indirect Thermistor. Check the sensor wiring for damage, confirm the indirect thermostat usage setting, measure the sensor resistance, and r…
Details
380
Exhaust Thermistor. Check the sensor wiring for damage, clean the surface of the sensor, measure the resistance, and check the return thermi…
Details
393
Outdoor Thermistor. Ensure that parameter number d0 is set to the appropriate position, then check the sensor wiring for damage and measure …
Details
400
Pressure Sensor. Check the sensor wiring for damage, measure the voltage of the sensor, and replace the sensor if necessary.…
Details
430
High/Low Water Pressure. If the water pressure is too low, add water into the system until at least 13 PSI is observed, and adjust high pres…
Details
443
Low Water Cut-Off (LWCO). Ensure the LWCO device is working correctly, the LWCO jumper is connected properly when not in use, and the output…
Details
520
Solenoid Valve Circuit. Check the flame rod and wire for damage, close the gas shut off valve installed near the boiler, and check the outpu…
Lockout
540
High Exhaust Temperature. Make sure the boiler pump activates during operation, check the exhaust thermistor wiring for damage, and check th…
Details
700
PC Board. A PC Board circuit error has occurred, so replace the PC Board.…
Details
720
Flame Rod. Check the flame rod and wire for damage, ensure they are not wet, and replace the PC Board if no issue is found.…
Lockout
763
0-10V Input. A 0-10V input overrange was detected, so check the external controller settings.…
Details
831
Indirect Tank Temperature. The indirect tank runs for more than twelve hours without cycling off, so check the tank size, thermistor locatio…
Details
890
Freeze Issue. The boiler checks the heat exchanger temperature at the time of operation, and an error occurs if the temperature is too low, …
Details
55
Service Soon. Service Soon (55) is a time-based service indicator set during installation, and it resets by pressing the Central Heating but…
Details
Rinnai Q-Series condensing boilers (block and error code short reference, Installation & Servicing Instructions 800000010)
Block 01
External safety contact cut off. The external safety contact is open, so the boiler blocks until the contact closes. The table classifies it…
Details
Block 05
Outdoor sensor not connected. The outdoor sensor is not connected, so the boiler blocks until the sensor is connected or the wiring is repai…
Details
Block 60
Incorrect parameter setting of the minimum or maximum power. The minimum or maximum power parameter is set incorrectly; the manual directs c…
Details
Block 67
Temperature difference detected between flow and return sensor while the burner is not in operation. A temperature difference was detected b…
Details
Block 85
No water flow detected - venting cycle started. The control has not detected water flow, so the venting cycle is started; if water flow is d…
Details
Error 00
Poor flame-forming. An ionization flow was detected although the boiler has not been burning, indicating incorrect flame formation; check th…
Lockout
Error 02
No flame-forming. The boiler has not been able to ignite any gas or has not received any gas after six start attempts with increasing starti…
Lockout
Error 04
Adjustment or error for voltage interruption. The controller detected a program error or voltage interruption; reset the boiler, rectify the…
Lockout
Error 05
Adjustment. A control unit error; check the 120V stability and the ribbon cable between the control unit and display, and replace the contro…
Lockout
Error 12
High limit stat. The high limit stat is open because the supply temperature is too high, caused by air in the system, a polluted circulation…
Lockout
Error 18
Maximum flow temperature exceeded. The flow water temperature exceeded 212°F; check the actual flow temperature and flow sensor resistance a…
Lockout
Error 19
Maximum return temperature exceeded. The return water temperature exceeded 212°F; check for an external heating source, check the return sen…
Lockout
Error 28
Number of revolutions not reported back from fan. No signal was received from the fan; check the fan wiring and 24-volt supply to the fan, a…
Lockout
Error 69
No or incorrect display. The display is missing or incorrect; check the ribbon cable between the control unit and the display and replace it…
Lockout
Rinnai previous-generation I-Series combi boilers (diagnostic codes, manual 800000111 hosted on the i060CN product page)
021
Continuous DHW. This code will display when DHW is in continuous operation for extended periods of time. • Ensure there are no open faucets.…
Details
100
Air Supply or Exhaust Blockage/Condensate Trap is Full. • Fan current initial check error. • Ensure condensate line and trap is not blocked.…
Details
110
No Ignition (Unit Not Turning On). • Ignition Error. • Check that the gas is turned on at the boiler, gas meter, and/or propane cylinder. • …
Lockout
120
Flame Failure. • Boiler has flame failure. • Check that the gas is turned on at the boiler, gas meter, and/or propane cylinder. • If the uni…
Lockout
140
Heat Exchanger Overheat. • Overheat switch is tripped. • Measure the resistance of the Overheat Switch. • Check the heat exchanger surface f…
Details
150
Venturi Control. • Venturi operation error. • Ensure the venturi motor is operating correctly. • Replace the gas valve assembly. The table c…
Details
161
High Outgoing Temperature. • Safety shutdown because DHW outgoing temperature is too hot. • Check sensor wiring for damage of outgoing therm…
Details
170
Venturi Blockage. • Check the venturi and silencer for blockage. • Before resetting this error, check if the condensate drain is block and i…
Details
190
Electrical Grounding. • Secondary circuit ground fault. • Check all electrical components for electrical short. The table classifies it as D…
Details
250
Condensate Pump (Accessory). • Boiler will operate for 60 seconds. • Confirm wire connections and harnesses are good. • Ensure the condensat…
Details
341
Inlet Thermistor. • Check sensor wiring for damage. • Measure the resistance of the sensor. • Replace if necessary. The table classifies it …
Details
353
Supply Thermistor. • Check sensor wiring for damage. • Clean the surface of the sensor. • Measure the resistance of the sensor. • Check the …
Details
321
Outgoing Thermistor. • Check sensor wiring for damage. • Clean sensor of any scale buildup present. • Measure the resistance of the sensor. …
Details
331
Heat Exchanger Thermistor. • Check sensor wiring for damage. • Measure the resistance of the sensor. • Replace if necessary. The table class…
Details
310
Freeze Protection Thermistor. • Check sensor wiring for damage. • Measure the resistance of the sensor. • Replace if necessary. The table cl…
Details
380
Exhaust Thermistor. • Check sensor wiring for damage. • Clean the surface of the sensor. • Measure the resistance of the sensor. • Check the…
Details
363
Return Thermistor. • Check sensor wiring for damage. • Measure the resistance of the sensor. • Replace if necessary. The table classifies it…
Details
393
Outdoor Thermistor. • Ensure that DIP switch 1 is set to the appropriate position. • Check sensor wiring for damage. • Measure the resistanc…
Details
400
Pressure Sensor. • Check sensor wiring for damage. • Measure the voltage of the sensor. • Replace if necessary. The table classifies it as D…
Details
430
High/Low Water Pressure. • If the water pressure is too low, add water into the system until at least 13 PSI is observed. • Ensure there are…
Details
443
Low Water Cut-Off (LWCO). • Ensure the LWCO device is working correctly. • Ensure the LWCO jumper is connected properly when LWCO is not in …
Details
520
Solenoid Valve Circuit. • Check the flame rod and wire for damage. • Close the gas shut off valve installed near the boiler. • Ensure the fl…
Lockout
540
High Exhaust Temperature. • Check the exhaust thermistor wiring for damage. • Clean the surface of the thermistor. • Measure the resistance …
Details
610
Combustion Fan. • Check the motor wire harness for loose or damaged connections. • Measure resistance and voltage of motor wire harness. • E…
Details
631
DHW Recirculation Pump. • Ensure the DHW recirculation matches the Parameter 12 setting. • Ensure the dedicated return line is properly inst…
Details
651
Water Flow Control. • Measure the resistance values and voltage of the water flow control. • Ensure the harness and connector are not wet. •…
Details
661
Bypass. • Measure the resistance values and voltage of the bypass servo valve. • Ensure the harness and connector are not wet. • If the volt…
Details
670
3-Way Valve. • Check the CH system water quality. • Measure the resistance values and voltage of the 3-way valve control. • Replace the 3-wa…
Details
681
Hot Water Supply Temperature Abnormality. • If the DHW water temperature is higher than the set point temperature because the boiler bypass …
Details
700
PC Board. • PC Board circuit error. • Replace PC Board. The table classifies it as Diagnostic Code.…
Details
710
Solenoid Valve Circuit. • Ensure Dip switch 5 on the PC Board is in the OFF position (default). • Ensure the gas control wire is not loose o…
Details
720
Flame Rod. • Check the flame rod and wire for damage. • Ensure the flame rod and wire are not wet. • If there is no issue with the flame rod…
Lockout
890
Freeze Issue. • The boiler checks the heat exchanger temperature at the time of operation. • If the temperature is too low, an error will oc…
Details
999
PC Board Mismatch. • This code occurs when the PC Board and the internal logic do not match. • Check if the software versions of the board a…
Details
LC
Scale Buildup in Heat Exchanger. • Flush the DHW plate heat exchanger. • The LC code will reset automatically when scaling is removed. If th…
Details
Rinnai previous-generation I-Series solo boilers (diagnostic codes, manual 800000112 hosted on the i060SN product page)
100
Air Supply or Exhaust Blockage/Condensate Trap is Full. • Fan current initial check error. • Ensure condensate line and trap is not blocked.…
Details
110
No Ignition (Unit Not Turning On). • Ignition Error. • Check that the gas is turned on at the boiler, gas meter, and/or propane cylinder. • …
Lockout
120
Flame Failure. • Boiler has flame failure. • Check that the gas is turned on at the boiler, gas meter, and/or propane cylinder. • If the uni…
Lockout
140
Heat Exchanger Overheat. • Overheat switch is tripped. • Measure the resistance of the Overheat Switch. • Check the heat exchanger surface f…
Details
150
Venturi Control. • Venturi operation error. • Ensure the venturi motor is operating correctly. • Replace the gas valve assembly. The table c…
Details
170
Venturi Blockage. • Check the venturi and silencer for blockage. • Before resetting this error, check if the condensate drain is block and i…
Details
181
Indirect Tank Temperature. • Indirect tank runs for more than six hours without cycling off. • Ensure the tank size is adequate. • Check the…
Details
190
Electrical Grounding. • Secondary circuit ground fault. • Check all electrical components for electrical short. The table classifies it as D…
Details
250
Condensate Pump (Accessory). • Boiler will operate for 60 seconds. • Confirm wire connections and harnesses are good. • Ensure the condensat…
Details
310
Freeze Protection Thermistor. • Check sensor wiring for damage. • Measure the resistance of the sensor. • Replace if necessary. The table cl…
Details
353
Supply Thermistor. • Check sensor wiring for damage. • Clean the surface of the sensor. • Measure the resistance of the sensor. • Check the …
Details
371
Indirect Tank Thermistor. • Ensure DIP switch 4 is set to the appropriate setting. • Check sensor wiring for damage. • Measure the resistanc…
Details
380
Exhaust Thermistor. • Check sensor wiring for damage. • Clean the surface of the sensor. • Measure the resistance of the sensor. • Check the…
Details
363
Return Thermistor. • Check sensor wiring for damage. • Measure the resistance of the sensor. • Replace if necessary. The table classifies it…
Details
393
Outdoor Thermistor. • Ensure that DIP switch 1 is set to the appropriate position. • Check sensor wiring for damage. • Measure the resistanc…
Details
400
Pressure Sensor. • Check sensor wiring for damage. • Measure the voltage of the sensor. • Replace if necessary. The table classifies it as D…
Details
430
High/Low Water Pressure. • If the water pressure is too low, add water into the system until at least 13 PSI is observed. • Ensure there are…
Details
443
Low Water Cut-Off (LWCO). • Ensure the LWCO device is working correctly. • Ensure the LWCO jumper is connected properly when LWCO is not in …
Details
520
Solenoid Valve Circuit. • Check the flame rod and wire for damage. • Close the gas shut off valve installed near the boiler. • Ensure the fl…
Lockout
540
High Exhaust Temperature. • Check the exhaust thermistor wiring for damage. • Clean the surface of the thermistor. • Measure the resistance …
Details
610
Combustion Fan. • Check the motor wire harness for loose or damaged connections. • Measure resistance and voltage of motor wire harness. • E…
Details
700
PC Board. • PC Board circuit error. • Replace PC Board. The table classifies it as Diagnostic Code.…
Details
710
Solenoid Valve Circuit. • Ensure Dip switch 5 on the PC Board is in the OFF position (default). • Ensure the gas control wire is not loose o…
Details
720
Flame Rod. • Check the flame rod and wire for damage. • Ensure the flame rod and wire are not wet. • If there is no issue with the flame rod…
Lockout
890
Freeze Issue. • The boiler checks the heat exchanger temperature at the time of operation. • If the temperature is too low, an error will oc…
Details
999
PC Board Mismatch. • This code occurs when the PC Board and the internal logic do not match. • Check if the software versions of the board a…
Lockout
Talk to a boiler technician
Describe what the boiler is doing and get a straight answer about the next step.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.