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We have 12 questions about mending 'main 30 switch' in category Heating, Home Heating Systems which have been answered
Oil fired boiler thermostat?
Greenstar 24Ri boiler, fast flashing - can I reset?
Vaillant ecotec 831 plus?
Worcester boiler dripping water?
How to fix my fireplace?
Remove boiler cover?
Siemens RDJ10RF thermostat problem?
Worcester 30 Cadillac combi boiler won’t fire up and the EA?
Remove cover off gas boiler?