Water throwing out of relief valve on boiler. Believe problem is related to the built in expansion tank. How can I prove this before I get an expert in?
If the pressure rises significantly when the heating is on, do the following check:
Turn off the electricity for safety's sake.
Top of boiler at the back, the expansion vessel is large and red, on it, you will find a schrader valve (very much like a car tyre valve), if you press it in briefly and no air comes out, the expansion vessel needs charging.
Carefree
October 2010
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