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To answer your questions 1. Yes 2. No The house, as far as the stat is concerned gets up to the set temperature then turns the boiler demand off. Then later turns it on again for 15 seconds then turns it off and repeats this until the temperature eventually drops enough to put the...

Yes, the thermostat calls for demand, indicator comes on, heating kicks in then about 15 seconds later, demand and indocator go off, heating turns off. I must have the most efficient and fastest temperature control loop ever, or a dodgy thermostat.

Hi there, I've recently replaced my old mechanical dial type central heating thermostat with a Honeywell CM907 programmalble one. All appeared to be working fine until my wife noticed that the heating would kick in (thermostat would click, pump run, boiler on, usual stuff) and then within...

:D Thanks for all of your help Softus. Most helpful.

Sorry for the delay..... What appears to be happening is that the F&E tank seems to be acting a bit like a radiator and warming up when the heating system is running, hot water being pumped through the vent pipe and back into the tank. I am, however, in a couple of weeks, planning a clean...

I've drained some water as suggested and while I wouldn't say it was exactly Evian it certainly wasn't black more a tad cloudy. I've heard somewhere about fitting an air seperator between the vent pipe and cold feed to the expansion tank does this mean anything to anyone?

This I can do. When I replaced the radiators last year I put two very convenient drain points at the lowest radiators. Thank you and stay tuned.

One cause of the symptoms you describe is advance corrosion. What's the contents of the F&E cistern like? The F&E cistern water is clear (small amount of sludge at bottom of tank) I've bled various radiators throughout the house and all water is clear, no black / rust present. Another...

Hi there, some assistance and expertise is required. I have a standard open central heating system which up until recently has been pretty well behaved. Now I having to regularly bleed the same 3 radiators due to the ingress of air into the system. Coupled with this the small feed /...