Hi All. Under pressure from the wife I fired up the central heating yesterday evening (why - it's only September!) for the first time since last winter.
Unfortunately the majority of the radiators haven;t come on, only the three nearest the boiler (I suspect due to heat conduction as opposed to water flow). I can't hear any swishing noises and the boiler heats up the water in short bursts - i,e, 5 secs to heat to set temp, then off until temp drops -suggesting it is only heating a small amount of water, and that the pump is not working. Is that a reasonable diagnosis? Theie are no fault indications on the boiler.
First impression are it could be the pump - so I'm going to drain the system (and flush it whilst I'm at it), remove the pump and have a look - is their anything I should look for when checking the pump? I'm going to take it into work and get the sparky to bench run it - is that not a good idea (dry running it)?
Other alternatives are the bleed valve on top of the pump (its missing its cap - could that cause a problem), or the flow sensor (if that was faulty would it stop the pump?).
Thanks in advance. Jim
Unfortunately the majority of the radiators haven;t come on, only the three nearest the boiler (I suspect due to heat conduction as opposed to water flow). I can't hear any swishing noises and the boiler heats up the water in short bursts - i,e, 5 secs to heat to set temp, then off until temp drops -suggesting it is only heating a small amount of water, and that the pump is not working. Is that a reasonable diagnosis? Theie are no fault indications on the boiler.
First impression are it could be the pump - so I'm going to drain the system (and flush it whilst I'm at it), remove the pump and have a look - is their anything I should look for when checking the pump? I'm going to take it into work and get the sparky to bench run it - is that not a good idea (dry running it)?
Other alternatives are the bleed valve on top of the pump (its missing its cap - could that cause a problem), or the flow sensor (if that was faulty would it stop the pump?).
Thanks in advance. Jim