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thanks! Is this stuck micro switch sensing easy to repair or I need to get a plumber? thanks again for your help.

Hope someone there can help me. My boiler celsia 24LE stopped properly just like that. We have to keep the boiler off all the time, otherwise CH goes on even it thermostat is turned to 0. If we want HW only, The CH goes. I had to turn all the radiators off and control the HW by switching the...