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Mend Sunvic 207XL Boiler Thermostat Heating

My Sunvic 207XL Controled system?

When I press the + One hour, for hot water the boiler won't start up, but if I turn up the thermostate and press the + One hour for heating as well, then the boiler fires up.
Any idea's why it wont run on hot water only please?

Thanking you,
Mike

Mike
June 2010
SunvicSunvic 207XLHeating, Home Heating SystemsBoiler Thermostat Heating
Not an answer, sorry.
Mine started doing this then the water heater stopped working completely last week.I still can't get it to work although the heating works ok?

Marc
October 2010
microswitch in motorised valve actuator is not working.

Ian
June 2010

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