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We have 38 questions about mending '30 red light' in category Heating, Home Heating Systems which have been answered
Fan tries to run every 15 seconds then stops immediately?
Remove boiler cover?
Vaillant ecotec 831 plus?
Worcester Bosch 532/i Combi Boiler?
Vaillant F22 fault?
Boiler cycle?
Siemens RDJ10RF thermostat problem?
How do I work my Storad storage heater?
Worcester boiler dripping water?