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Found the problem Boiler Thermostat faulty. Boiler would not shut down at higher thermostat settings! Problem proven by: Turning down CH themostat so CH circuit switched off. Turned up Hot Water tank stat to ensure hot water circuit was demanding. Turned up boiler temp setting to normal (mid )...

Bolier By-pass; Where do I find that please, is that the "balancing tap" near the two MV's ? The system shuts down OK when both valves are shut.. shuts down the boiler every time. Thanks.

How the system was flushed: It was simply drained off from the drain point at the boiler, refilled and inhibitor added.

Hi There, The system is a Potterton Flamingo 50S and it's approx 20 years old. Both Central Heating and HW work OK. I noted that the "boiling" occurs when HW MV is open and CH MV is closed. I also note that the system seems to be working when the Boiler temp knob is turned right down. If...

I recently had to flush the CH system due to a leaking valve which needed to be replaced. I had the boiler serviced at the same time. Since the system has been refilled and radiators balanced I experience an intermiitted thunderous bubbling sound coming from the loft. It looks like the water...