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