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This CH system does not have room stat so I cannot conduct that part of the test. Unless there is another scenario that will produce the same situation?

Hi, I've drawn a blank. Still none the wiser. Having checked the voltages on the wires and got the results as stated... anyone any clues what to do/check next? Thanks

Hi, thanks for you reply. I needed to get a multimeter as couldn't find my old one, last seen years ago! ok, got a multimeter. The system has no CH stat and works just on radiator thermostatic valves. EVERY radiator has these valves. I turned the rad valves up high, switched CH only on...

Hi. I've scanned the forums and not quickly found a solution unfortunately. Hot water only works fine. Hot water and CH together works fine for a period of time then can lock out and boiler tries 3 times to refire then shuts down. CH on it's own doesn't work at all. Doesn't even try to...