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We have 374 questions about mending 'heat exchanger gone' in category Heating, Home Heating Systems which have been answered
Remove boiler cover?
Fan tries to run every 15 seconds then stops immediately?
Siemens RDJ10RF thermostat problem?
Worcester boiler dripping water?
Boiler cycle?
Worcester Bosch 532/i Combi Boiler?
Vaillant ecotec 831 plus?
How do I work my Storad storage heater?
Vaillant F22 fault?