For the last few months we have had an annoying intermittant problem with our Boilermate 2000 from Gledhill. The issue is that the domestic hot water supply temperature “pulses”, with periods of cold water interspersed with periods of hot water, a couple of times per minute.

The last time we called out a plumber, he said “It could be a sensor failing, but theres nothing wrong right now so you’ll have to wait for a complete failure before calling us back out”. Grrrr.

Last night, Alison couldn’t get any hot water for a bath, so I ran the diagnostics myself (otherwise, knowing my luck the plumber would come out when everything had started working again). The problem was fairly obvious on the diagnostic control pannel – the PHE return sensor was showing an error when there was no water flowing, and wildly fluctuating with somethimes ludicrous values while water was flowing.

Today, I have, from Parts Centre, a brand new sensor ready for fitting tonight. I’ll let you know how it goes.