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Thanks. Have fitted a new Grundfos Alpha pump. No real change. However, the old pump was original so the same age as boiler. The pipes were approx 1/3 blocked with baked on limescale/ other. I believe therefore that it is likely that heat exchanger could be the same. To summarise, have...

No manual reset. It just keeps cycling-- turn on , “overheat”, switch off, cool down a bit and switch on etc. When I say cool down I guess that the pump has pumped some cooler water into the boiler? I have never done a manual reset, how is this achieved?

Thanks very much. I will try this later this weekend and let you know.

Thanks. Boiler relights once it is a bit cooler. Last engineer will not touch it as the heater unit has asbestos. As for the stat knob I will try it and see what happens. I generally have it between 3 and 4, 5 is highest. Can it be recalibrate? The last engineer said to try a new pump, old...

Thanks for taking the time to reply. I was however looking for help with finding some experts in my area. I have contacted Glowworm and asked them to confirm the part numbers and suggest an expert but sadly have had no reply. Changing boiler is not possible at his stage without significant...

Boiler: Glowworm fuelsaver F45 Symptom: Once up to heat, boiler runs for 30sec -minute then turns off as is overheating. Actions: 1 Have drained the system several times and each time added stronger cleaner, Fernox, sentinal , Wickes own, the final was Fernox Ds40 - citric acid. No...