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We have 14 questions about mending 'red unit working' in category Heating, Home Heating Systems which have been answered
Vaillant ecotec 831 plus?
Siemens RDJ10RF thermostat problem?
Vaillant F22 fault?
Worcester Bosch 532/i Combi Boiler?
Fan tries to run every 15 seconds then stops immediately?
Boiler cycle?
Worcester boiler dripping water?
Remove boiler cover?
How do I work my Storad storage heater?