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We have 705 questions about mending 'saying code com' in category Heating, Home Heating Systems which have been answered
Remove boiler cover?
Worcester Bosch 532/i Combi Boiler?
Boiler cycle?
Siemens RDJ10RF thermostat problem?
Fan tries to run every 15 seconds then stops immediately?
Worcester boiler dripping water?
Vaillant ecotec 831 plus?
Vaillant F22 fault?
How do I work my Storad storage heater?