SOURCE: Combi Boiler - Running warm & then cold!? HELP!
the problem was solved on my system by replacing thermostatic valve on shower and putting non return valves on hot and cold feed to shower . the problem was caused by cold water getting into the hot water line through the shower hope this helps
SOURCE: boiler keeps losing pressure when the heatings off
Hi Leehardcast,
Yes the problems are related. The system is low on water. So now instead of water you have air in radiators which is easily compressed when it heats up. Then pressure loss when it cools down.
Add some water to your system until you have 15lb pressure and bleed out upstairs radiators at the same time.
Please rate this response and Good luck, Phil
SOURCE: Worcester combi boiler losing pressure & water through o/flow
having the same problem and its a new bolier. thanks , adriano.
SOURCE: alpha 240e boiler wont fire up for hot water, will for heating
most likely the diverter valve.. when hot tap turned on the movement of the water through the valve operates a diaphragm which pushes a pin/button//switch to tell the boiler to fire up
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