> My Glowworm Compact 100 boiler does not heat the radiators enough.
> > When the boiler gets up to temperature the burner cuts in for about 5
> > seconds then stops for 1 minute then continually repeats it. Any ideas
> If it gets up to temperature then the flame must cut off or the temperature
> will continue to rise!
> Are you saying that the heat is not being circulated around the radiators?
Yes, albeit they are warm - hot, just not hot enough.
If so perhaps a flow restriction is your problem. The compact has an
> internal bypass which if this is all that is clear to flow through will lead
> to symptoms such as you describe.
> Did this problem start following someone doing some work on the system or is
> it a slow developing thing?
The boiler was fitted 2 years ago, I have put up with it cycling for this period as it is generally warm enough and I have been ignoring it, but last week it was colder outside.
> What temperature does the water actually leave the boiler at?
Hotter than the radiators, but the burners are not on for long enough.
> If it is hot, then the boiler may not be at fault. You might have a poorly
> > balanced system, a broken zone valve or pump that prevents the hot water
> > being pumped through the radiators.
What does 'balanced' mean. (It is fitted to a 3 storey house.) I don't believe I ahve any zone valves. How do you check the pump?