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We have 97 questions about mending 'every 20 seconds' in category Heating, Home Heating Systems which have been answered
Siemens RDJ10RF thermostat problem?
Worcester boiler dripping water?
How do I work my Storad storage heater?
Vaillant F22 fault?
Boiler cycle?
Remove boiler cover?
Worcester Bosch 532/i Combi Boiler?
Fan tries to run every 15 seconds then stops immediately?
Vaillant ecotec 831 plus?