Recent content by jakey_200

Red LED on, green LED off indicates no external call for heat. A competant electrician (only do this yourself if competant!) can check if this is so. 1. Set the programmer to CH on, HW off. 2. Turn the room thermostat right down. 3. Measure the voltage between N and the terminal...

Yippee.. no more eruptions. Posting this is final stage of exhaustive test procedure; designed to provoke more trouble by claiming to have fixed it! £6.88 for new thermistor (plus a tenner for the new pot I bought but don't need) lovingly fitted with a blob of thermal paste and all has...

Thanks for all the legwork ChrisR. I agree with your sentiments about prats that ignore installation instructions.. makes life hard for the rest of us. In this case, wish I had bought a big cold house with no heating, then could have specified something sensible and would have done the...

Thanks DP. Re no by pass, the boiler keeps the pump running for several minutes after the gas is switched off, to protect against boiling from residual heat. There are 3 rads with no TRV, so heating circuit is never closed. There does appear to be the risk of this happening in the "CH off, HW...

Pipes from boiler are 28mm - no lagging. There is no automatic by-pass valve on the pump. There are 3 rads with no TRV Have had room stat and all TRVs set high, to try to keep flowrate up in heating circuit. There is a 4 gallon expansion (header) tank in the loft. When the boiling occurs...

Potterton Suprima 120 / Megaflo 250.. annual dickathon... worse than previous years.. can't keep it alive now... trips out and shuts down. Trip is real.. preceded by gurgling and sounds of boiling and displaced water out of overflow. PCB is new... boiler stat works.. motorised valves work...