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Heating Problems?

My heating is not working, but I have hot water. someone has told me the acuvator may need replacing?

Michael
October 2012
Heating, Home Heating SystemsHeating Hot Water Replacing
Check your thermostat. Override it if you can, to make sure not that. other than that post with what is happening when you turn it to heating. CH is the default position of internal parts, it has to switch over from CH to HW when HW is asked for. Check valves, check radiators open etc.

SD
October 2012

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Heating Not Working, Hot Water OK - Help!