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At the beginning of April I had a friend who is a heating engineer with a laser guided thermometer spend a lot of time measuring all the temperatures in the system. What I thought was very hot, was in fact 60 c, the feed line, after a few minutes to stabilise, remained around 60 c and the...

The saga continues. A new pump was fitted on Thursday, I tried the "finger test" before the new one was fitted as before I had no reference, it is difficult to be objective with one sample. I could feel no difference between the two, they both burnt my finger before they could be stopped. The...

The pump has been removed and the impeller checked. There is no dirt or sludge visible, the only deposit is a fine dark brown/black film on wet surfaces. The pump rotates freely, no noticeable wear in bearings. We did consider changing body with a standard version but the ratings on the end...

Thanks for advice. My Gas Safe friend has been round, all pressures seem to be correct as listed in the service manual for this boiler. About 11.5/8 Mb at full hot water flow, dropping to 2Mb when CH hot. So gas valve seems to be ok. The only conclusion we came to is that the pump, although...

The only work on the boiler is to replace the fan relay three years ago, the PCB was then replaced with a recon unit two years ago due to spark transformer failure and in Jan. this year the diaphragm in the diverter valve replaced. The gas valve has not been touched other than to remove the...

CB28 overheat problem. The diverter valve diaphragm has been replaced recently, so has overheat thermostat. Boiler trips out with red(A) led flashing red at approx 1 sec interval, i.e. overheat stat fail. Thermistors in HW and Primary circuit check ok, 10k when luke warm, 3.8/4k hot. Pump seems...