I recently had a new gas boiler installed (condensing, but not combi) and the central heating converted to fully pumped but not pressurised. Inhibiter was added to the system the next day after installation. I have since had to bleed the bathroom radiator twice (not getting hot at the top) and my lounge radiator at both ends (same problem). Is this normal after installation? All radiators are original and the system has always contained inhibitor.
The system now seems to be working fine and has a rapid warm-up time. However, every time the boiler fires, I can hear a clicking noise from my bedroom radiator, which varies in frequency from several times a second to once every few seconds. This is most annoying as it wakes me up at 6 o'clock every morning. I've tried reducing the flow by turning down the valve on the rad. and also setting the pump to 2 instead of 3, but all to no avail. The only cure is to shut off the radiator completely, but then my bedroom is cold in the morning.
None of the radiators are fitted with thermostatic valves and the problem did not occur with the old boiler. I think that the problem may be due to thermal expansion but is there anything I can do to eliminate this annoying noise? All other rads are quiet.
Terry D.