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We have 78 questions about mending 'switch unit second' in category Heating, Home Heating Systems which have been answered
Fan tries to run every 15 seconds then stops immediately?
Worcester Bosch 532/i Combi Boiler?
Vaillant F22 fault?
Remove boiler cover?
Siemens RDJ10RF thermostat problem?
Vaillant ecotec 831 plus?
How do I work my Storad storage heater?
Worcester boiler dripping water?
Boiler cycle?