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