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Thanx again. All wires are connected. Seems strange to have to replace actuator as it is only a few years since i last changed it..that might mean more than 5yrs..can't rememb.So that's those 2 diagonally opposite posidrive screws on base?to remove actuator I mean. Thanx 4 being so incredibly...

Hi DHailsham, did as u recommended. So ignoring step 11,step 12-HW stat back to max & boiler comes on & pipe to cyl gets hot-yes. Then 13. boiler went off but NOT on again. 14. CH stat to min but boiler already off & 15. valve lever WAS loose. 16 power off & after a few seconds there WAS...

Great clear steps DHailsham. Thanx. Everything was a 'yes' on ur list (except lever did have resistance, so not stuck valve) until point 11. When I turned HW stat to min, boiler went off but did not come back on even though CH was on and max on stat.Not sure wot2do now. I tried putting CH stat...

DHailsham, thanx a lot 4 taking so much trouble! I have printed off ur reply & am gonna go get down & dirty with the system..well not so dirty. Thanx again.

Thanx 4 ur reply. No, i don't have a multimeter. Feared this may b needed. I could just replace head. how is it attached? Do i need 2 drain down?

My C. Heating comes on ,reaches temp then switches off but doesn't come back on even though 'on' cycle is not finished.It will come on again on new cycle when both HW & CH are requested. Room stat works(clicks). Have tried switching both tank stat & room stat to zero then turning each on with...