Ideal Heating · Error codes
Ideal Heating 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.
Ideal Exalt wall and floor condensing boilers and combis (CTRLMax manual reset lockouts and automatic reset blocking lockouts, user manual 241581-5)
E1
Failed Ignition. The burner failed to light after 5 ignition attempts. The table classifies it as Manual Reset Lockout.…
Lockout
E2
False Flame. Flame was detected prior to ignition. The table classifies it as Manual Reset Lockout.…
Lockout
E3
High Boiler Temperature. Boiler temperature has reached 210°F [99ºC] or 102°F [39°C]. The table classifies it as Manual Reset Lockout.…
Lockout
E5
Blower Speed. The blower is not at the correct speed or the speed signal is not being received by the control module. The table classifies i…
Lockout
E8
Flame Circuit Error. The flame circuit test failed. The table classifies it as Manual Reset Lockout.…
Lockout
E9
Gas Valve Circuit Error. The gas valve circuit test failed. The table classifies it as Manual Reset Lockout.…
Lockout
E13
Reset Limit Reached. Resets are limited to 5 every 15 minutes. The table classifies it as Manual Reset Lockout.…
Lockout
E15
Sensor Drift. The supply or return sensor reading has drifted. The table classifies it as Manual Reset Lockout.…
Lockout
E16
Supply Sensor Stuck. The supply sensor reading is not changing. The table classifies it as Manual Reset Lockout.…
Lockout
E17
Return Sensor Stuck. The return sensor reading is not changing. The table classifies it as Manual Reset Lockout.…
Lockout
E18
Sensor Failure. The supply or return sensor reading changed very rapidly. The table classifies it as Manual Reset Lockout.…
Lockout
E19
Flame Failure During Startup Phase. Flame was lost after startup. The table classifies it as Manual Reset Lockout.…
Lockout
E21
Internal Control Fault. An A/D conversion error was detected. The table classifies it as Manual Reset Lockout.…
Lockout
E30
Supply Sensor Shorted. A short circuit has been detected in the boiler supply temperature sensor circuit. The table classifies it as Manual …
Lockout
E31
Supply Sensor Open. An open circuit has been detected in the boiler supply temperature sensor circuit. The table classifies it as Manual Res…
Lockout
E43
Return Sensor Shorted. A short circuit has been detected in the boiler return temperature sensor circuit. The table classifies it as Manual …
Lockout
E44
Return Sensor Open. An open circuit has been detected in the boiler return temperature sensor circuit. The table classifies it as Manual Res…
Lockout
E47
Water Pressure Sensor Error. The water pressure sensor is disconnected or broken. The table classifies it as Manual Reset Lockout.…
Lockout
E80
Return > Supply. The return temperature is higher than the supply temperature. The table classifies it as Manual Reset Lockout.…
Lockout
E83
Delta T Protection. An excessive difference between boiler supply and return temperatures has occurred 5 times. The table classifies it as M…
Lockout
E87
External Limit Open. An external manual reset limit has opened. The table classifies it as Manual Reset Lockout.…
Lockout
E7
High Flue Temperature. The flue temperature exceeds the high limit. The table classifies it as Blocking (Auto Reset).…
Details
E12
Internal Control Fault. EEPROM misconfiguration. The table classifies it as Blocking (Auto Reset).…
Details
E25
Internal Control Fault. A CRC check error was detected. The table classifies it as Blocking (Auto Reset).…
Details
E32
DHW Sensor Shorted. A short circuit has been detected in the DHW temperature sensor circuit. The table classifies it as Blocking (Auto Reset…
Details
E33
DHW Sensor Open. An open circuit has been detected in the DHW temperature sensor circuit. The table classifies it as Blocking (Auto Reset).…
Details
E34
Low Voltage. Line voltage has fallen below an acceptable operating level. The table classifies it as Blocking (Auto Reset).…
Details
E37
Low Water. Water pressure has fallen below 7.2 psi. The table classifies it as Blocking (Auto Reset).…
Details
E45
Flue Sensor Shorted. A short circuit has been detected in the boiler flue temperature sensor circuit. The table classifies it as Blocking (A…
Details
E46
Flue Sensor Open. An open circuit has been detected in the boiler flue temperature sensor circuit. The table classifies it as Blocking (Auto…
Details
E76
External Limit Open. An external automatic reset boiler limit has opened. The table classifies it as Blocking (Auto Reset).…
Details
E77
High Mix Circuit Temperature. The mix circuit temperature exceeds the mix zone high limit setting. The table classifies it as Blocking (Auto…
Details
E78
Mix Circuit Sensor Shorted. A short circuit has been detected in the mix circuit temperature sensor circuit. The table classifies it as Bloc…
Details
E79
Mix Circuit Sensor Open. An open circuit has been detected in the mix circuit temperature sensor circuit. The table classifies it as Blockin…
Details
E81
Sensor Drift. The supply and return temperatures are not equal. The table classifies it as Blocking (Auto Reset).…
Details
E82
Delta T Protection. An excessive difference between the boiler supply and return temperatures. The table classifies it as Blocking (Auto Res…
Details
E89
Incorrect Setting. A parameter setting is in conflict with another setting. The table classifies it as Blocking (Auto Reset).…
Details
E90
Firmware Mismatch. The control module and display firmware versions are incompatible. The table classifies it as Blocking (Auto Reset).…
Details
E91
System Sensor Shorted. A short circuit has been detected in the system temperature sensor circuit. The table classifies it as Blocking (Auto…
Details
E92
System Sensor Open. An open circuit has been detected in the system temperature sensor circuit. The table classifies it as Blocking (Auto Re…
Details
E93
Outdoor Sensor Shorted. A short circuit has been detected in the outdoor temperature sensor circuit. The table classifies it as Blocking (Au…
Details
E94
Internal Display Fault. A display memory error. The table classifies it as Blocking (Auto Reset).…
Details
E95
Supply Sensor Error. The supply sensor reading is invalid. The table classifies it as Blocking (Auto Reset).…
Details
E96
Outdoor Sensor Open. An open circuit has been detected in the outdoor temperature sensor circuit. The table classifies it as Blocking (Auto …
Details
E97
Cascade Mismatch. The cascade configuration has changed. The table classifies it as Blocking (Auto Reset).…
Details
E98
Cascade Bus Error. Communication with other boilers has been lost. The table classifies it as Blocking (Auto Reset).…
Details
E99
Controller Bus Error. Communication between the boiler display and the control module has been lost. The table classifies it as Blocking (Au…
Details
Ideal Gallant wall condensing boilers (CTRLMax manual reset lockouts, user manual A1010801-664A2200)
E1
Failed Ignition. The burner failed to light after 5 ignition attempts. The table classifies it as Manual Reset Lockout.…
Lockout
E2
False Flame. Flame was detected prior to ignition. The table classifies it as Manual Reset Lockout.…
Lockout
E3
High Boiler Temperature. Boiler temperature has reached 210°F [99ºC] or 102°F [39°C]. The table classifies it as Manual Reset Lockout.…
Lockout
E5
Blower Speed. The blower is not at the correct speed or the speed signal is not being received by the control module. The table classifies i…
Lockout
E8
Flame Circuit Error. The flame circuit test failed. The table classifies it as Manual Reset Lockout.…
Lockout
E9
Gas Valve Circuit Error. The gas valve circuit test failed. The table classifies it as Manual Reset Lockout.…
Lockout
E13
Reset Limit Reached. Resets are limited to 5 every 15 minutes. The table classifies it as Manual Reset Lockout.…
Lockout
E15
Sensor Drift. The supply or return sensor reading has drifted. The table classifies it as Manual Reset Lockout.…
Lockout
E16
Supply Sensor Stuck. The supply sensor reading is not changing. The table classifies it as Manual Reset Lockout.…
Lockout
E17
Return Sensor Stuck. The return sensor reading is not changing. The table classifies it as Manual Reset Lockout.…
Lockout
E18
Sensor Failure. The supply or return sensor reading changed very rapidly. The table classifies it as Manual Reset Lockout.…
Lockout
E19
Flame Failure During Startup Phase. Flame was lost after startup. The table classifies it as Manual Reset Lockout.…
Lockout
E21
Internal Control Fault. An A/D conversion error was detected. The table classifies it as Manual Reset Lockout.…
Lockout
E30
Supply Sensor Shorted. A short circuit has been detected in the boiler supply temperature sensor circuit. The table classifies it as Manual …
Lockout
E31
Supply Sensor Open. An open circuit has been detected in the boiler supply temperature sensor circuit. The table classifies it as Manual Res…
Lockout
E43
Return Sensor Shorted. A short circuit has been detected in the boiler return temperature sensor circuit. The table classifies it as Manual …
Lockout
E44
Return Sensor Open. An open circuit has been detected in the boiler return temperature sensor circuit. The table classifies it as Manual Res…
Lockout
E47
Water Pressure Sensor Error. The water pressure sensor is disconnected or broken. The table classifies it as Manual Reset Lockout.…
Lockout
E80
Return > Supply. The return temperature is higher than the supply temperature. The table classifies it as Manual Reset Lockout.…
Lockout
E83
Delta T Protection. An excessive difference between boiler supply and return temperatures has occurred 5 times. The table classifies it as M…
Lockout
E84
High Flue Temperature. The flue temperature has exceeded the high limit 5 times. The table classifies it as Manual Reset Lockout.…
Lockout
E87
External Limit Open. An external manual reset limit has opened. The table classifies it as Manual Reset Lockout.…
Lockout
Ideal Commodore Wall CB boilers (lockout, blocking and warning code tables, installation manual IOM_CB_CH)
0
EEPROM Read Error. Internal software error wrongly programmed BCU or PB. The table classifies it as Lockout.…
Lockout
1
Ignition Error. Five unsuccessful ignition attempts in a row no gas, wrongly adjusted gas valve. The table classifies it as Lockout.…
Lockout
2
GasValve Relay Error. Failure detected in the gas valve relay short circuit in coil of the gas valve, water on wiring or gas valve. The tabl…
Lockout
3
Safety Relay Error. Failure detected in safety relay safety relay is not working correctly. The table classifies it as Lockout.…
Lockout
4
Blocking Too Long Error. Control had a blocking error for more than 20 hours blocking code active for more than 20 hours. The table classifi…
Lockout
5
Fan Not Running. Fan is not running for more than 60 seconds electrical wiring not correctly connected, or Fan is malfunctioning. The table …
Lockout
6
Fan Too Slow. Fan runs too slow for more than 60 seconds electrical wiring not correctly connected, or Fan is malfunctioning. The table clas…
Lockout
7
Fan Too Fast. Fan runs too fast for more than 60 seconds electrical wiring not correctly connected, or Fan is malfunctioning. The table clas…
Lockout
8
RAM Error. Internal software error wrongly programmed BCU or PB. The table classifies it as Lockout.…
Lockout
9
Wrong EEPROM Signature. Contents of E2prom is not up to date outdated E2prom. The table classifies it as Lockout.…
Lockout
10
EEPROM Error. Wrong safety parameters in E2prom wrongly programmed BCU or PB. The table classifies it as Lockout.…
Lockout
11
State Error. Internal software error wrongly programmed BCU or PB. The table classifies it as Lockout.…
Lockout
12
ROM Error. Internal software error wrongly programmed BCU or PB. The table classifies it as Lockout.…
Lockout
13
Air Switch Not Open. Air pressure switch not opening during pre-purge 0 electrical circuit is short circuited, or APS is jammed. The table c…
Lockout
14
Air Switch Not Closed. Air pressure switch not closing during pre-purge 1 no air transport to the burner; flue or air inlet is blocked, or A…
Lockout
15
Max. Thermostat Lock Error. The external overheat protection is enabled or the T_Supply sensor measures a temp. of over Prot_Overheat_Temp -…
Lockout
16
Max. Flue Lock Error. Flue temperature exceeded the maximum flue temperature There is no water in the heat exchanger or flue gas sensor is m…
Lockout
17
Stack Error. Internal software error wrongly programmed BCU or PB. The table classifies it as Lockout.…
Lockout
18
Instruction Error. Internal software error wrongly programmed BCU or PB. The table classifies it as Lockout.…
Lockout
19
Ion Check Failed. Internal software error wrongly programmed BCU or PB. The table classifies it as Lockout.…
Lockout
20
Flame Out Too Late Error. Flame still present 10 seconds after closing the gas valve wrong earthing of BCU and boiler. The table classifies …
Lockout
21
Flame Before Ignition. Flame is detected before ignition wrong earthing of BCU and boiler. The table classifies it as Lockout.…
Lockout
22
Too Many Flame Failures. Three times flame lost during 1 demand bad gas supply or CO2 level is not correct or bad ignition rod. The table cl…
Lockout
23
Corrupted Error Number. Error code RAM byte was corrupted to an unknown error code. wrongly programmed BCU or PB. The table classifies it as…
Lockout
27
Filling Too Much. Too many automated filling attempts in a short time period If output is programmed as filing valve and there are too many …
Lockout
28
Fill Time Error. Filling takes too long If output is programmed as filing valve and filling takes more than 10 minutes. The table classifies…
Lockout
29
PSM Error. Internal software error wrongly programmed BCU or PB. The table classifies it as Lockout.…
Lockout
30
Register Error. Internal software error wrongly programmed BCU or PB. The table classifies it as Lockout.…
Lockout
32
T. Exchange Diff Error. The 2 exchange sensors deviate too much for more than 60 seconds There is not enough water flow through the heat exc…
Lockout
33
LWCO/Air intake block. Low water cut off 1 error There is no water in the heat exchanger or not electrically connected. The table classifies…
Lockout
34
LWCO 2 Error. Low water cut off 2 error There is no water in the heat exchanger or not electrically connected. The table classifies it as Lo…
Lockout
35
Air Switch Not Closed. Air pressure switch not closing during post-purge 1 no air transport to the burner after heat demand; flue or air inl…
Lockout
36
Gas Pressure Error. Gas pressure switch open for more than E2_GPS_Timeout wrong gas pressure on gas supply; loose cabling on terminal. The t…
Lockout
100
WD Error Ram. Internal software error wrongly programmed BCU or PB. The table classifies it as Blocking.…
Details
101
WD Error Rom. Internal software error wrongly programmed BCU or PB. The table classifies it as Blocking.…
Details
102
WD Error Stack. Internal software error wrongly programmed BCU or PB. The table classifies it as Blocking.…
Details
103
WD Error Register. Internal software error wrongly programmed BCU or PB. The table classifies it as Blocking.…
Details
104
WD Error Xrl. Internal software error wrongly programmed BCU or PB. The table classifies it as Blocking.…
Details
105
High Temp Error. T_Supply sensor measures over Stay_Burning_Temp for a period of Max_Value_Period. not enough waterflow overheat exchanger. …
Details
106
Refhi Too Hi Error. Internal hardware error wrongly programmed BCU or PB. The table classifies it as Blocking.…
Details
107
Refhi Too Lo Error. Internal hardware error wrongly programmed BCU or PB. The table classifies it as Blocking.…
Details
108
Reflo Too Hi Error. Internal hardware error wrongly programmed BCU or PB. The table classifies it as Blocking.…
Details
109
Reflo Too Lo Error. Internal hardware error wrongly programmed BCU or PB. The table classifies it as Blocking.…
Details
110
Refhi2 Too Hi Error. Internal hardware error wrongly programmed BCU or PB. The table classifies it as Blocking.…
Details
111
Refhi2 Too Lo Error. Internal hardware error wrongly programmed BCU or PB. The table classifies it as Blocking.…
Details
112
Reflo2 Too Hi Error. Internal hardware error wrongly programmed BCU or PB. The table classifies it as Blocking.…
Details
113
Reflo2 Too Lo Error. Internal hardware error wrongly programmed BCU or PB. The table classifies it as Blocking.…
Details
114
False Flame. Flame is detected in a state in which no flame is allowed to be seen wrong earthing of BCU and boiler. The table classifies it …
Lockout
116
Low Water Pressure Sensor. Low water pressure, generated when the pressure drops below Minimal Pressure, or when the pressure drops below 4.…
Details
118
WD Communication Error. Watchdog communication error wrong programmed BCU or PB. The table classifies it as Blocking.…
Details
119
T Return Open. Return sensor open malfunctioning return sensor or not connected. The table classifies it as Blocking.…
Details
120
T Supply Open. Supply sensor open malfunctioning supply sensor or not connected. The table classifies it as Blocking.…
Details
122
T DHW Open. DHW sensor open malfunctioning DHW sensor or not connected. The table classifies it as Blocking.…
Details
123
T Flue Open. Flue sensor open malfunctioning flue sensor or not connected. The table classifies it as Blocking.…
Details
125
T Outdoor Open. Outdoor sensor open malfunctioning outdoor sensor or not connected or wrong CH-mode programmed. The table classifies it as B…
Details
126
T Return Shorted. Return sensor shorted malfunctioning return sensor or short circuiting. The table classifies it as Blocking.…
Details
127
T Supply Shorted. Supply sensor shorted malfunctioning supply sensor or short circuiting. The table classifies it as Blocking.…
Details
129
T DHW Shorted. DHW sensor shorted malfunctioning DHW sensor or short circuiting. The table classifies it as Blocking.…
Details
130
T Flue Shorted. Flue sensor shorted malfunctioning Flue sensor or short circuiting. The table classifies it as Blocking.…
Details
132
T Outdoor Shorted. Outdoor sensor shorted malfunctioning Outdoor sensor or short circuiting. The table classifies it as Blocking.…
Details
134
Reset Button Error. Too many resets in a short time period Reset many times by user or installer. The table classifies it as Blocking.…
Details
136
T_Exchange Block Error. Exchange temperature exceeded 194 ºF (90 ºC). water temperature is above 194 ºF (90 ºC). The table classifies it as …
Details
155
WD Config Error. Watchdog fan configuration setting error wrongly programmed BCU or PB. The table classifies it as Blocking.…
Details
162
Fill Warning. Error is generated immediately when the pressure drops below Minimal Pressure. Demand has stopped, but no error needs to be st…
Details
164
Ex. Low Flow Protection. Flow is too low, demand needs to be stopped with fan at ignition speed*, but no error needed to be stored at this t…
Lockout
167
Low Gas Pressure. The low gas pressure switch input is detected as Open Gas pressure is outside settings or wire bridge is missing. The tabl…
Details
168
Flue Temperature Too High. The flue temperature exceeded the maximum flue temperature Dirty combustion chamber. The table classifies it as B…
Details
169
ADC Unstable. ADC measurements detected too many unstable measurements Defective sensor or unstable 0-10V input. The table classifies it as …
Details
200
Comm. Lost with module. Cascade System: Managing cascade control lost communication with one of the depending. connection between cascaded b…
Details
202
App. Selection Error. Unknown appliance model selected wrongly programmed parameters. The table classifies it as Warning.…
Details
203
Comm. Lost with boiler. Dual Cascade System: Managing cascade control lost communication with one of the depending. connection between casca…
Details
204
T Outdoor Wrong. T_Outdoor sensor measures open/shorted malfunctioning outdoor sensor or not connected or wrong CH-mode programmed. The tabl…
Details
205
T System Wrong. T_System sensor measures open/shorted malfunctioning system sensor or not connected. The table classifies it as Warning.…
Details
206
T Cascade Wrong. T_Cascade sensor measures open/shorted malfunctioning cascade sensor or not connected. The table classifies it as Warning.…
Details
207
Heat-Exchanger protection active. The heat-exchanger protection function is actively blocking the burn demand ∆T (T_Supply – T_Return) is to…
Details
Talk to a boiler technician
Describe what the boiler is doing and get a straight answer about the next step.
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