boiler problem

[marleyco]

Hi,
Some help needed, Glow worm compact 100 fanned flue system boiler is working, but cuts out before the room temperature has been reached. Initially i thought room stat but as the boiler cuts out, it makes a winding down noise that, although not loud, sound like an aeroplane falling from the sky. The house is set up with 2 identical boilers, 1 serving heating to upstairs and hot water, with the other serving heat to downstairs only or vice versa. the operation between the 2 can be easily compared with them being side by side.
I haven't done too many tests on the problem boiler as electrical results seemed ok, maybe due to the fact that the boiler tachnically still works.
Any advice much appreciated

Simon

 

[wnjswozo]

is it a condensing boiler

 

[marleyco]

its been a couple of weeks since ive been at job, so bit hard to remember, i dont think it is condensing, if i was wrong could it have something to do with it

 

[wnjswozo]

if its a condenser you do get funny noise,s if co/co2 ratio is out need to do fga test

 

[marleyco]

thanks, i will get back on the case this week. hopefully your right