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We have 40 questions about mending 'heat exchanger fault' in category Heating, Home Heating Systems which have been answered
Greenstar 24Ri boiler, fast flashing - can I reset?
Oil fired boiler thermostat?
How do i stop the time from flashing on the Siemens RDJ100RF?
Worcester 30 Cadillac combi boiler won’t fire up and the EA?
Worcester boiler dripping water?
Vaillant ecotec 831 plus?
Remove boiler cover?
Remove cover off gas boiler?
How to fix my fireplace?