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We have 148 questions about mending 'working start second' in category Heating, Home Heating Systems which have been answered
Remove boiler cover?
Boiler cycle?
Worcester boiler dripping water?
Vaillant F22 fault?
Vaillant ecotec 831 plus?
Worcester Bosch 532/i Combi Boiler?
Fan tries to run every 15 seconds then stops immediately?
Siemens RDJ10RF thermostat problem?
How do I work my Storad storage heater?