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Perhaps you have fixed it by now but, it could be the overheat thermostat playing up - i.e. tripping much too early. They are easy to replace and about £25. The genuine replacement I got was not calibrated right so it was similar to yours - tripping too early. I calibrated it in some hot water...

That's a good point Agile. Don't point them at shiny surfaces. The closer you can get the better. I have compared mine with a contact one from work. Remarkably similar readings...

Whoops saw now that the orignal post was from April :D Neatheats need some care - if you search on Google you will come up with some heavy stuff on deaths caused by CO leaks etc. Not sure if your one runs +ve case pressure. Always ensure the front cover is always on when you run it and...

Don't you hate intermittant faults... I'm not familiar with the Glowworm unit but... Could be an airlock so the water is getting too hot in the boiler as it cannot circulate properly. Why though would it be fine sometimes and not others. If the airlock is moved then bleeding the rads /...

Just an update and info for the archive for others should they search for thermo problems. The Overheat Thermo for this model is Ranco 404449. T90deg C Once the new overheat thermostat was installed the water temp only got up to 53 deg C before it tripped out. This was with it set at max...

The overheat thermostat is starting to make a lot of radio interference on switch off. I was pondering how to remove the probe. Sorted. It just pulls out and the new probe pushes in.