Recent content by diw70

There is no zone valve. There is a three way diverter valve in the boiler which normally allows the pump to pump water around the heat exchanger and then onto the radiators via the flow and return pipes. If you then call for hot water the diverter valve temporarily creates a loop from the heat...

Combi boiler (Ravenheat) - upstairs radiators hot, most of downstairs cool or cold. Boiler located downstairs and feeds upstairs radiators and then T's off to come back down stairs. Downstairs will get hot if upstairs radiators shut off. New pump fitted but symptoms remain. On initial firing...