Lennox · Error codes
Lennox 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.
Lennox GCWB95 condensing combination boilers (numeric error messages, user's information manual 240012894)
09
Gas valve connection fault. The gas valve connection faulted; the manual directs calling an authorized service technician. The table classif…
Details
10
Outdoor sensor fault. The outdoor sensor faulted; the manual directs calling an authorized service technician. The table classifies it as Er…
Details
15
Gas valve error. The gas valve reported an error; the manual directs calling an authorized service technician. The table classifies it as Er…
Details
20
Central Heating NTC sensor fault. The central heating NTC sensor faulted; the manual directs calling an authorized service technician. The t…
Details
28-29
Flue NTC heat exchanger sensor fault. The flue NTC heat exchanger sensor faulted; the manual directs calling an authorized service technicia…
Details
40
Return NTC sensor fault. The return NTC sensor faulted; the manual directs calling an authorized service technician. The table classifies it…
Details
50
Domestic Hot Water NTC sensor fault (only for heating-only model with storage boiler). The domestic hot water NTC sensor faulted on the heat…
Details
53
Obstruction in flue pipe. An obstruction was detected in the flue pipe; turn the boiler off for a few seconds, and if the fault persists cal…
Details
55
PCB not programmed. The PCB is not programmed; the manual directs calling an authorized service technician. The table classifies it as Error…
Details
83-84-85
Communication problem between boiler board and control unit. A communication problem between the boiler board and the control unit, with a p…
Details
86-87
Communication problem between boiler board and control unit. A communication problem between the boiler board and the control unit, with a p…
Details
98
Internal error. The boiler reported an internal error; the manual directs calling an authorized service technician. The table classifies it …
Details
109
Precirculation alarm (temporary fault). A precirculation alarm, described as a temporary fault; the manual directs calling an authorized ser…
Details
110
Safety thermostat tripped due to over temperature. The safety thermostat tripped due to over temperature, with a probable blocked pump or ai…
Details
118
Hydraulic pressure too low. The hydraulic pressure is too low; the manual directs calling an authorized service technician. The table classi…
Details
125
No circulation safety trip (control performed via temperature sensor). The no-circulation safety tripped, controlled via the temperature sen…
Details
128
Loss of flame. The boiler lost flame; press the RESET (R) button for at least 2 seconds and call an authorized service technician if the fau…
Details
130-131
Flue NTC sensor tripped due to over temperature. The flue NTC sensor tripped due to over temperature; the manual directs calling an authoriz…
Details
133
Ignition failure (5 attempts). Ignition failed after 5 attempts; press the RESET (R) button for at least 2 seconds and call an authorized se…
Lockout
134
Gas supply valve blocked. The gas supply valve is blocked; press the RESET (R) button for at least 2 seconds and call an authorized service …
Details
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.