Crown Boiler Co. · Error codes
Crown Boiler Co. 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.
Crown (Velocity) Phantom II boilers and combis (fault tables 18-5/18-6, I&O 110332-07)
H01
Anti-Short Cycle. While a thermostat demand is present the boiler cycled off too quickly and restart is delayed [01.0], or an urgent calibra…
Details
H02
Safety Limit Open. An external safety limit is open (check the jumper is installed per the wiring diagram if no external limit is used, veri…
Details
H04
Supply High Limit. Supply temperature is higher than 200°F (93°C) [04.0] or, when used, the preferred outlet/flow high limit minus 10°. Caus…
Details
E04
Supply High Limit. Supply temperature is higher than 210°F (99°C) [04.1] or, when used, the preferred outlet/flow high limit (manual reset l…
Lockout
H05
Low Water Flow. Temperature rise between supply and return is greater than 63°F (17°C) [05.0], or the boiler water flow switch does not dete…
Details
E05
Low Water Flow. Boiler water flow switch does not detect water flow after 5 retries [05.2], temperature rise between supply and return excee…
Lockout
H06
Flue High Limit. Flue sensor detected temperatures in excess of 194°F (90°C) [06.0] or, when used, the preferred stack/flue limit minus 10°.…
Details
E06
Flue High Limit. Flue sensor detected temperatures in excess of 204°F (96°C) [06.1] or, when used, the preferred stack/flue limit. Clean the…
Lockout
H07
Return Temp Higher than Supply. Return temperature is higher than supply temperature [07.1]. Verify the boiler is piped correctly, check pum…
Details
E07
Return Temp Higher than Supply. Return temperature is higher than supply temperature [07.0]. Check for reversed flow through the boiler, wro…
Lockout
H08
Return Sensor Fault. The return temperature sensor is shorted, opened or miswired [08.0]. Check the return sensor wiring and replace the sen…
Details
H09
Supply Sensor Fault. The supply temperature sensor is shorted, opened or miswired [09.0]. Check the supply sensor wiring and sensor resistan…
Details
E09
Supply Sensor Fault. The supply temperature sensor is shorted, opened or miswired for longer than 10 seconds [09.1], or the temperature diff…
Lockout
H11
Flue Sensor Fault. The flue temperature sensor is shorted, opened or miswired [11.0]. Check flue sensor wiring and sensor resistance per Tab…
Details
E11
Flue Sensor Fault. The flue temperature sensor is shorted, opened or miswired for longer than 10 seconds [11.1]. Check wiring and sensor res…
Lockout
H12
Outdoor Air Sensor Fault. The outdoor air temperature sensor is shorted, opened or miswired [12.0]. Check the outdoor sensor wiring and resi…
Details
H13
Header Sensor Fault. The header or recirculation temperature sensor is shorted, opened or miswired [13.0]. Disable Comfort Mode [A02] if sel…
Details
H14
0-10 Vdc / 4-20 mAdc Input Fault. The 0-10 Vdc input is out of range [14.0], the 4-20 mAdc input is out of range [14.1], or the analog input…
Details
E15
Air Proving Switch (APS) - Failed to Open. The air pressure switch detects airflow while the fan is not running - the switch contact is clos…
Lockout
H16
Low Combustion Air Flow. Fan speed is not proven during running mode [16.2]. Check the vent and air inlet for blockage, clean the heat excha…
Details
E16
Low Combustion Air Flow. The air proving switch does not detect air flow for more than 51 seconds [16.0], fan standstill was not reached [16…
Lockout
H17
Invalid Safety Parameters. The internal safety core is in program mode [17.0] or has an error [17.1], the model key and BCC mismatch [17.4],…
Details
E17
Invalid Safety Parameters. Internal safety core error [17.2, 17.3], application parameter does not match the safety core parameter [17.5], o…
Lockout
H18
Invalid Application Parameters. Application parameters are not valid [18.0], parameter model mismatch [18.1], CH setpoint and modulation sou…
Details
E18
Invalid Application Parameters. Application parameters are not valid following a new parameter download [18.0] or the selected boiler model …
Lockout
E19
Flame Signal Fault during Run. Flame signal deviation from setpoint is too high [19.0]. Verify there is no air in the gas line and check the…
Lockout
H20
Flame Signal Fault during Calibration. Flame signal deviation from setpoint is too high during calibration [20.0]. Check the air inlet for o…
Lockout
E20
Flame Signal Fault during Calibration. Flame signal is too low [20.1] or too high [20.2] during calibration, calibration is too different fr…
Lockout
H21
Fuel Gas Fault. Flame signal deviation from setpoint is too high [21.0], or the gas valve is defective [21.1]. Verify there is no air in the…
Lockout
E21
Fuel Gas Fault. Flame signal deviation from setpoint is too high after a second occurrence [21.2] or the gas valve wiring is at fault [21.3]…
Lockout
H22
No Flame After Ignition. Flame signal too low at burner start - H22.0 is shown after the first four unsuccessful attempts with a one hour ho…
Lockout
E22
No Flame After Ignition. Flame signal too low at burner start - E22.1 is shown after the fifth unsuccessful attempt [22.1]. Check the igniti…
Lockout
H23
Flame Out of Sequence. Defective control flame amplifier [23.2]. A flame was detected out of sequence; verify the condensate trap is not blo…
Details
E23
Flame Out of Sequence. Flame was detected before the burner start [23.0], flame was detected for 15 seconds after the gas valve closed [23.1…
Lockout
H24
Flame Loss During Run. Flame signal loss in operation with the minimum firing rate raised for one hour [24.0], flame signal loss in the stab…
Lockout
E24
Flame Loss During Run. Flame signal loss in the safety time after a second 24.2 occurrence [24.3]. Verify gas supply pressure, remove vent o…
Lockout
H25
Hardware Fault. Defective control - internal safety core error [25.0]. Replace the control if the problem persists. The table classifies it …
Details
E25
Hardware Fault. Defective control - internal application core error [25.2] or internal safety core error [25.3, 25.4, 25.5], or an unknown i…
Lockout
H26
Calibration Fault. Stable conditions to perform the gas valve offset adaptation were not reached [26.0], stable conditions to perform calibr…
Details
E26
Calibration Fault. Calibration is missing - the calibration counter reached zero [26.2]. Resolve what is preventing the boiler from running …
Lockout
H27
120 VAC Supply Fault. 120 VAC supply voltage is less than 73 VAC [27.0]. Check the 120 VAC supply and correct any issues. The table classifi…
Details
H28
24 VAC Supply Fault. Control 24 VAC has the wrong frequency or high electrical noise [28.0]. Check the 120 VAC supply and correct the issue;…
Details
E29
Excessive Reset Selection. The control reset button has been selected too often [29.0]. Cycle power to the control and press the reset butto…
Lockout
H30
Sequencer Fault. Duplicate slave boiler addresses [30.0], a sequencer slave lost communication with the sequencer master or the master heade…
Details
H31
Variable Speed Pump Fault. Variable speed pump feedback fault when pump feedback is used to prove boiler water flow [31.0] or when the flow …
Details
H32
Zone Panel Fault. Zone Panel 1-4 communication lost [32.0-32.3], zone panel electronics failure [32.4], or duplicate zone panel [32.5]. Chec…
Details
H10
DHW Sensor Fault (Combi models). The DHW temperature sensor is shorted, opened or miswired [10.0] - combi models only. Check the DHW sensor …
Details
Crown (Velocity) Phantom-X boilers (soft and hard lockout codes, I&O 105357-06)
ER0011
Adjustment Mode Password Timeout. The Control and Display are NOT defective - the password has timed out. Cycle power to the Display to rest…
Details
ER0012
Control Failed. Defective Control. Replace Sage2.x. The table classifies it as Display fault.…
Details
**00FF / **ERFF
Display Lost Communication. Display lost communication with the control - check for a loose or defective display harness, a defective displa…
Details
1
Anti-Short Cycle. Minimum time between starts has not been reached - normal delay used to avoid excessive cycles. The table classifies it as…
Lockout
2
Boiler Safety Limit Open. Boiler safety limit wired to terminals J6-1, 2 or 3 OPEN: condensate trap float switch contact open, thermal link …
Lockout
3
Boiler Safety Limit Open (External Limit). Boiler safety limit or external limit wired to terminals J5-1 OPEN: jumper for the external limit…
Lockout
7
Return Sensor Fault. Shorted or open return temperature sensor - check for shorted or mis-wired return sensor wiring, or a defective return …
Lockout
8
Supply Sensor Fault. Shorted or open supply temperature sensor - check for shorted or mis-wired supply sensor wiring, or a defective supply …
Lockout
9
DHW Sensor Fault. Shorted or open domestic hot water (DHW) temperature sensor - check the DHW sensor wiring or replace a defective DHW senso…
Lockout
10
Stack Sensor Fault. Shorted or open flue gas (stack) temperature sensor - check the flue temperature sensor wiring or replace a defective fl…
Lockout
11
Ignition Failure. Models PHNTM210 through PHNTM285B - flame failure after 5 tries to restart. Check no gas pressure or gas pressure under th…
Lockout
13
Flame Rod Shorted to Ground. Flame rod shorted to ground - check for shorted or mis-wired flame rod wiring or a defective flame rod. The tab…
Lockout
14
DT Inlet/Outlet High. Temperature rise between supply and return is too high - inadequate boiler water flow (verify the circulator is operat…
Lockout
15
Return Temp Higher than Supply. The control is reading a return sensor temperature higher than the supply sensor temperature; the condition …
Lockout
16
Supply Temp Has Risen Too Quickly. Supply water temperature has risen too quickly - inadequate boiler water flow; verify the circulator is o…
Lockout
17
Blower Speed Not Proved. Normal waiting for the blower speed to match the purge and light-off setpoint. The table classifies it as Soft lock…
Lockout
4
Supply High Limit. Sage2.x supply sensor detected temperatures in excess of 210°F. Possible causes: heating load far below the minimum firin…
Lockout
5
DHW High Limit. Sage2.x DHW sensor detected temperatures in excess of setpoint - DHW load at the time of the error was far below the minimum…
Lockout
6
Stack High Limit. Sage2.x flue gas (stack) sensor detected temperatures in excess of 204°F (95.6°C) - the heat exchanger needs cleaning, the…
Lockout
12
Flame Detected Out of Sequence. A flame signal was present when there should be no flame - defective gas valve (make sure inlet pressure is …
Lockout
18
Light-off Rate Proving Failed. Blower is not running at the light-off rate when it should, or the blower speed signal is not being detected …
Lockout
19
Purge Rate Proving Failed. Blower is not running at the purge rate when it should, or the blower speed signal is not being detected by Sage2…
Lockout
20
Invalid Safety Parameters. Unacceptable Sage2.x control safety related parameter detected - the parameter change was invalid; check the para…
Lockout
21
Invalid Modulation Parameter. Unacceptable Sage2.x control modulation related parameter detected - reset the control. The table classifies i…
Lockout
22
Safety Data Verification Needed. A safety related parameter change has been detected and a verification has not been completed - perform the…
Lockout
23
24 VAC Voltage Low/High. Sage2.x control 24 VAC control power is high or low - loose 24 VAC power wiring, loose or mis-wired 24 VAC harness,…
Lockout
24
Fuel Valve Error. Power detected at the fuel valve output when the fuel valve should be off - loose or defective gas valve harness (check el…
Lockout
25
Hardware Fault. Internal control failure - reset the control; if the problem reoccurs replace the Sage2.x. The table classifies it as Hard l…
Lockout
26
Internal Fault. Internal control failure - reset the control; if the problem reoccurs replace the Sage2.x. The table classifies it as Hard l…
Lockout
27
Unknown Fault. Unknown fault - reset the control; if the problem reoccurs replace the Sage2.x. The table classifies it as Hard lockout (manu…
Lockout
Crown Aruba 4 cast-iron boilers (Err codes, manual PN 9902339)
4
Low Flame Signal. Low gas pressure at the gas valve inlet, partially plugged pilot tubing or orifice, loose connection in the ignition cable…
Lockout
6
Pilot Flame Detected When No Flame Should Be Present. High gas pressure or a defective control. The table classifies it as Error code (Honey…
Lockout
18
Internal Electronics Failure. Possible internal problem with the boiler control - cycle power to the boiler and replace the control if the p…
Details
23
Flame Sensed During 1.7s Pre-purge (Before Pilot Valve Opened). Defective gas valve, high gas pressure, or defective control. The table clas…
Details
32
Boiler Water Temperature Sensor Failure. Loose sensor connection at the control, defective sensor, or defective control. The table classifie…
Details
35
Duplicate Zone. Error code reserved for future use. The table classifies it as Error code (Honeywell S9361A display).…
Details
55
Damper Failed to Open After 60s. Loose or defective damper harness, obstruction in the path of the damper blade, defective damper, or defect…
Details
56
Power at End of Limit String When It Shouldn't Be. Control, vent damper, or damper harness is defective. With Error 56 present and no call f…
Details
57
Grounded Pilot Electrode. Condensate or foreign material is shorting the pilot electrode to ground, ignition cable insulation is damaged and…
Lockout
58
AC Power Frequency Error. 120 VAC power supply frequency is incorrect (should be 60 Hz) or the 120 VAC power supply is dirty (consult an ele…
Details
59
Line Voltage Error (Supply Voltage Too High or Low). Boiler water temperature sensor common (center wire) is damaged and shorted to ground, …
Details
60
Thermostat Input Higher Than Threshold. External voltage is applied to the thermostat connections (most common cause is an external transfor…
Details
61
Line Voltage Unstable. 120 VAC power supply is dirty (consult an electrician and/or the utility), loose 120 VAC or 24 VAC connection between…
Details
63
Maximum Recycles Exceeded. See Error Code 4 above - the boiler lost proof of pilot 6 times in a row. The table classifies it as Error code (…
Details
64
Internal Failure. Loose or defective damper harness, obstruction in the path of the damper blade, defective damper, improper pilot operation…
Details
89
EnviraCom Communication Lost. Communication lost between the boiler control and certain Crown control options - consult the Crown control op…
Details
Crown Aruba 6 cast-iron boilers (Err codes, IOM 112933-01)
4
Flame Current Lower than Threshold. Low flame signal - check pilot assembly. Refer to Troubleshooting Section D6. The table classifies it as…
Lockout
6
Flame Sensed Out of Normal Sequence. Flame sensed out of normal sequence (before opening gas valve or after closing gas valve) - check gas v…
Details
18
Electronics Failure. Cycle power to control. Replace control if problem persists. The table classifies it as error.…
Details
23
Flame Sensed During Pre-purge. Flame sensed during pre-purge (before gas valve signaled open) - check the gas valve for proper operation, re…
Details
32
Temperature Sensor Failure. Temperature sensor or interface failure (open or short connection, increased connection resistance, dual sensor …
Details
55
Damper Failed to Open. Atmospheric damper end switch failed to close (end switch contacts stuck open). Refer to Troubleshooting Section D5. …
Details
56
Damper Failed to Close. Damper open - voltage should not be present on P6-5. Control, vent damper or wire harness defective: remove call for…
Details
57
Flame Rod Shorted to Burner Ground. Flame rod shorted to burner ground, can result from excessive flue gas condensation - check for excessiv…
Lockout
58
AC Line Frequency. Error AC signal is too noisy or frequency is incorrect - check supply voltage. The table classifies it as error.…
Details
59
Line Voltage Error. AC voltage out of specification high or low - check supply voltage. The table classifies it as error.…
Details
60
Thermostat Input Higher than Threshold. Check thermostat wiring. The table classifies it as error.…
Details
61
Line Voltage Unstable. Possibly too many heavy loads switching on and off cause erratic supply voltage - check supply voltage. The table cla…
Details
63
Soft Lockout - Maximum Recycles Exceeded. Maximum number of recycles exceeded - burner lost flame during running mode (StA 8) six times. Ref…
Details
64
Soft Lockout - Internal Failure. Electronics detected an error - actual controller internal fault or wiring fault: check vent damper, cycle …
Details
Crown Bali 3 induced-draft boilers (fault codes, IOM 113323-02)
2
Pressure Switch failed to open. Jumped air pressure switch, condensate in air pressure switch or switch tubing, defective air pressure switc…
Details
4
Low Flame Signal. Low gas pressure at gas valve inlet, partially plugged pilot tubing or orifice, loose connection in ignition cable or grou…
Lockout
6
Pilot Flame detected when no flame should be present. High gas pressure, defective control The table classifies it as error.…
Lockout
18
Internal electronics failure. Possible internal problem with boiler control - cycle power to the boiler and replace control if problem persi…
Details
23
Flame sensed during 30s pre-purge (before pilot valve opened). Defective gas valve, high gas pressure, defective control The table classifie…
Details
29
Air pressure switch failed to close. Vent system blockage, vent system not constructed per manual (excessive length, undersized pipe, wrong …
Details
32
Boiler water temperature sensor failure. Loose sensor connection at control, defective sensor, defective control The table classifies it as …
Details
35
Duplicate Zone. Error code reserved for future use The table classifies it as error.…
Details
57
Grounded pilot electrode. Condensate or foreign material shorting pilot electrode to ground, ignition cable insulation damaged and touching …
Lockout
58
AC Power Frequency Error. 120 VAC power supply frequency incorrect (should be 60 Hz), 120 VAC power supply dirty (consult electrician and/or…
Details
59
Line voltage error (Supply voltage too high or low). Boiler water temperature sensor common (center wire) damaged and shorted to ground, pow…
Details
60
Thermostat input higher than threshold. External voltage applied to thermostat connections (most common cause is external transformer in old…
Details
61
Line Voltage Unstable. 120 VAC power supply dirty, loose 120 VAC or 24 VAC connection between transformer and control, large electrical load…
Details
63
Maximum recycles exceeded. See Error Code 4 above (boiler lost proof of pilot 6 times in a row) The table classifies it as error.…
Details
64
Internal failure. Improper pilot operation; if problem persists, replace control The table classifies it as error.…
Details
89
EnviraCom communication lost. Should not be observed on this boiler The table classifies it as error.…
Details
Crown Raptor and Raptor Combi boilers (fault codes, IOM 107363-02)
2
Boiler Safety Limit Open. Boiler safety limit wired to terminals J6-1 or J6-3 OPEN - External limit (water temp higher than setting, no devi…
Lockout
3
Boiler Safety Limit Open. Blocked vent switch wired to terminals J5-1 OPEN - check for blocked flue/air intake (air pressure switch opens wh…
Lockout
7
Return Sensor (10 KOhms) Fault. Shorted or open return temperature sensor - shorted or mis-wired return sensor wiring, defective return sens…
Lockout
8
Supply Sensor (10 KOhms) Fault. Shorted or open supply temperature sensor - shorted or mis-wired supply sensor wiring, defective supply sens…
Lockout
10
Stack Sensor (10 KOhms) Fault. Shorted or open flue gas (stack) temperature sensor - shorted or mis-wired flue temperature sensor wiring, de…
Lockout
11
Ignition Failure. Flame failure after 5 tries to restart, flame rod not detecting flame - no gas pressure, gas pressure under minimum on rat…
Lockout
13
Flame Rod Shorted to Ground. Flame rod shorted to ground - shorted or mis-wired flame rod wiring, defective flame rod The table classifies i…
Lockout
14
Differential Temperature Inlet/Outlet High. Temperature rise between supply and return too high - inadequate boiler water flow (verify circu…
Lockout
15
Return Temp Higher than Supply. Control reads return sensor temperature higher than supply (present at least 75 seconds) - flow through boil…
Lockout
16
Supply Temp Has Risen Too Quickly. Supply water temperature has risen too quickly - see causes for Hard Lockout 4; inadequate boiler water f…
Lockout
17
Blower Speed Not Proved (Purge/Light-off). Normal waiting for blower speed to match purge and light-off setpoint The table classifies it as …
Lockout
27
Undefined Fault. Consult factory The table classifies it as soft lockout.…
Lockout
28 or 53
Air Proving Switch Failed to Close. Air proving switch failed to close - check switch, connection and wiring; blocked vent, blocked inlet, b…
Lockout
54
Air Proving Switch Failed to Open. Air proving switch closed when it should be open (checked before blower starts) - switch jumpered, switch…
Lockout
4
Supply High Limit. Control supply sensor detected temperatures in excess of 210°F - heating load far below minimum firing rate, defective sy…
Lockout
6
Stack High Limit. Control flue gas (stack) sensor detected temperatures in excess of 214°F (101°C) - heat exchanger needs cleaning, boiler o…
Lockout
12
Flame Detected Out of Sequence. A flame signal was present when there should be no flame - defective gas valve (make sure inlet pressure bel…
Lockout
18
Light-off Rate Proving Failed. Blower not running at light-off rate when it should or blower speed signal not detected by Control - loose 12…
Lockout
19
Purge Rate Proving Failed. Blower not running at purge rate when it should or blower speed signal not detected by Control - loose 120 VAC bl…
Lockout
20
Invalid Safety Parameters. Unacceptable control safety related parameter detected - safety parameter verification required, contact factory …
Lockout
21
Invalid Modulation Parameter. Unacceptable control modulation related parameter detected - reset the control The table classifies it as hard…
Lockout
22
Safety Data Verification Needed. Safety related parameter change detected and verification has not been completed - safety related control p…
Lockout
23
24VAC Voltage Low/High. Control 24Vac control power is high or low - loose 24Vac power wiring, loose or miswired harness, miswired harness s…
Lockout
24
Fuel Valve Error. Power detected at fuel valve output when fuel valve should be off - reset the control; if problem reoccurs, replace the Co…
Lockout
25
Hardware Fault. Internal control failure - reset the control; if problem reoccurs, replace the Control The table classifies it as hard locko…
Lockout
26
Internal Fault. Internal control failure - reset the control; if problem reoccurs, replace the Control The table classifies it as hard locko…
Lockout
27
Undefined Fault. Reset the Control; if problem reoccurs, replace the Control The table classifies it as hard lockout.…
Lockout
54
Air Proving Switch Failed to Open. See Soft Lockout 54 The table classifies it as hard lockout.…
Lockout
Crown Bimini BWC gas condensing boilers (legacy manual, MCBA generation)
b 08
Pressure switch circuit open. Blockage in intake or vent system, vent/intake not constructed per Part VI, blocked or leaking pressure switch…
Lockout
b 18
MCBA supply sensor detected temperatures in excess of 200°F. Heating load far below minimum firing rate, defective primary pump or no flow i…
Lockout
b 19
MCBA return sensor detected temperatures in excess of 200°F. See possible causes for b18; flow through boiler reversed; sensor wiring revers…
Lockout
b 24
MCBA reading a return sensor temperature higher than the supply sensor temperature (present at least 75s). Flow through boiler reversed (ver…
Lockout
b 25
Supply water temperature has risen too quickly. See possible causes for b18; inadequate boiler water flow (verify pump operating and pump/pi…
Lockout
b 26
Boiler safety limit, or external limit wired across terminals 3 & 4, is open. External limit open (remove jumper between terminals 3 and 4 w…
Lockout
b 30
Temperature rise between supply and return is too high. See possible causes for b18; inadequate boiler water flow (verify pump operating and…
Lockout
b 61
Pressure switch circuit closed with fan off. Blockage in pressure switch hose, pressure switch wires shorted together, defective pressure sw…
Lockout
b 65
Fan is not achieving set point speed. Loose or incorrect fan speed control connection, defective fan The table classifies it as soft lockout…
Lockout
E 00
A flame signal was present when there should be no flame. Defective gas valve - make sure inlet pressure is below maximum on rating plate be…
Lockout
E 02
Flame failure after 5 tries to restart. No gas pressure, gas pressure under minimum value on rating plate, gas line not completely purged of…
Lockout
E 03
Gas valve error. Loose or defective gas valve harness - check electrical connections; defective gas valve (check for 24 VDC at harness durin…
Lockout
E 04/E 05/E 06
Power failure occurred after lockout. Some other error on this list occurred and power to the boiler was then interrupted - reset control an…
Lockout
E 07/E 11
Internal control failure. Reset the control. If problem reoccurs, replace the MCBA. The table classifies it as hard lockout.…
Lockout
E 12
Low water cut-off circuit open. If yellow light on LWCO is on, system is low on water; if neither yellow nor green light is on, check LWCO h…
Lockout
E 13/E 14/E 15/E 16/E 17
Internal control failure. Reset the control. If problem reoccurs, replace the MCBA. The table classifies it as hard lockout.…
Lockout
E 18
MCBA supply sensor detected temperatures in excess of 200°F for an extended period of time. See possible causes for b18 error. Also check sa…
Lockout
E 19
MCBA return sensor detected temperatures in excess of 200°F for an extended period of time. See possible causes for b19 error. The table cla…
Lockout
E 28
Blower is not running when it should or fan speed signal not being detected by MCBA. Loose connection in 120 VAC fan wiring, loose or miswir…
Lockout
E 29
Blower fan speed has not returned to zero rpm. Miswired fan speed harness, defective fan The table classifies it as hard lockout.…
Lockout
E 31
Shorted supply temperature sensor. Shorted or miswired supply sensor wiring, defective supply sensor The table classifies it as hard lockout…
Lockout
E 32
Shorted return temperature sensor. Shorted or miswired return sensor wiring, defective return sensor The table classifies it as hard lockout…
Lockout
E 35
Flue gas temperature sensor short circuit. Shorted or miswired flue temp sensor wiring, defective flue temp sensor The table classifies it a…
Lockout
E 36
Supply water temperature sensor circuit open. Loose or miswired supply sensor wiring, defective supply sensor The table classifies it as har…
Lockout
E 37
Return water temperature sensor circuit open. Loose or miswired return sensor wiring, defective return sensor The table classifies it as har…
Lockout
E 40
Flue gas temperature sensor circuit open. Loose or miswired flue temp sensor wiring, defective flue temp sensor The table classifies it as h…
Lockout
E 44
Internal control failure. Reset the control. If problem reoccurs, replace the MCBA. The table classifies it as hard lockout.…
Lockout
E 52
Flue gas temperature over 230°F. Heat exchanger needs to be cleaned, boiler over-fired, air-fuel mixture out of adjustment - consult factory…
Lockout
E 60
Internal control failure. Reset the control. If problem reoccurs, replace the MCBA. The table classifies it as hard lockout.…
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.