In an earlier contribution to this discussion,
BluesCon wrote:


The burner appears to be staying on all the time and not cycling on
and off. It will go off when I turn the boiler stat down to LOW but
otherwise appears to stay ON. I will check this again before posting
back. I'm away for a few days so may not post back on this till the
weekend.

It's important to check the flow temperature then. You just *could* be using
the entire boiler output without the water temperature ever getting hot
enough to turn the stat off.

One other thing to check that is that the bulb of the thermostat is making
good contact with the heat exchanger. I seem to remember that there's
supposed to be some sort of paste in the pocket to ensure good heat
transfer.
--
Cheers,
Set Square
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