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We have 84 questions about mending 'optimax he 31c' in category Heating, Home Heating Systems
BMU error code?
Thorn Harcal 460?
Fan tries to run every 15 seconds then stops immediately?
Greenstar 24Ri boiler, fast flashing - can I reset?
Have I got got a faulty programmer?
Oil fired boiler thermostat?
Siemens RDJ10RF thermostat problem?
Canon caress 2000 gas fire?
Reset my worcester dt10rf programmer?
Greenstar 25 combo boiler?
Remove cover off gas boiler?
How can i mend my baxi combi 105a?
How do I work my Storad storage heater?
Boiler cycle?
British Gas 532/i Gas Combi Boiler?
Greenstar Highflow 440?
Power but not activating Baxi 105e boiler?
Advice?
F40 fault?
Britony Combi Se boiler 40 & 80 lights flashing?
Remove boiler cover?
Worcester 30 Cadillac combi boiler won’t fire up and the EA?
Vaillant F22 fault?
Vaillant ecotec 831 plus?
Worcester boiler dripping water?
Worcester Bosch 532/i Combi Boiler?
Ideal Isar H30?
Morco gb 24?
How to fix my fireplace?
Firebird super Q 50/82?