Mistral Boiler Error Codes 2021
Initial user checks
You are able to make some checks before calling out a service engineer.
- Check you have enough fuel: check the sight gauge.
- Check the fuel supply valves are open.
- Check the external fire valve hasn't tripped: press the trip button.
- Is the boiler electrical supply on?
- Is the control panel high limit thermostat tripped? Check and reset if needed.
- Burner control box locked out: check and press the lens.
Mistral boiler error codes
|Burner does not start||Air locks, supply lines blocked or tank vent blocked (no fuel getting into tank)|
|Restriction suspected / fuel supply fault||Power supply to the boiler failed, burner control box locked out, burner motor fault or pump seized|
|Burner fault locks out after 15 seconds||Photocell fault, restricted oil supply, combustion setting out of specification|
|No flame established (burner fault)||Ignition failure, oil restricted or nozzle locked|
|Burner fault runs but continually pulsates||Condensate trap blocked or flue system blocked|
|Lock-out||Losing oil in the supply suction line or oil level in tank below minimum level|
|Burner running but smokes||Tank topped with wrong fuel/ Air supply restricted/ Dust build up|
|Burner flame shuts down slowly||Balanced flue system leaking/ Combustion leaks/ Suction line drawing air into fuel|
|Burner fails to reach working temperature||Burner output restricted/ Low efficiency/ Control thermostat fault|
|Oil smells||Oil leakage at connection|
|No hot water||Circulating pump seized/ Programmer channel off|
|Flow and water temperature low||Programmer for central heating or domestic hot water are off, debris build-up or low water supply pressure|
|No central heating or hot water||Programmer channels are off, thermostat fault or turned off|
|Thermostat trips off||Fault circulating pump|
|No central heating||Spring fault or return valve not moving or operating properly – room stat error|
|No domestic hot water||Spring fault, jammed in how water mode, flow switch blocked or faulty|
|Discharges on pressure relief valve||Pressure vessel has lost charge, insufficient expansion volume|
Need a boiler repair?