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Armo 74 - last question, I promise ! OK, so which way should I manually turn the valve - anti-clockwise or clockwise. Like I said, the valve seems to hardly move - I've read it should move 70 degrees, it's barely moving 15. Should I get this to replace the whole assembly ...

Here's what the Wiki on this site says (cut and pasted): 10) HOT WATER OK BUT RADS COLD (or vice versa) THANKS TO CHRISR Usually down to motorised valve failure This will work for fully pumped systems, for both a single 3 port valve or two x 2 port valves. Or a combination, come to...

Arno. Sorry to keep plaguing you with questions ! What I can't understand is - if that silver unit (Honeywell, with the dimple on the box) has been taken off the assembly on which it sits (as I have done) and I'm operating the little valve it's meant to control manually, then surely the...

I was just following the advice on your wiki (see the section about what to do if the hot water's working the heat isn't). If that's not right, maybe it should be changed. Without sounding snotty - I'm just a poor layman (in every sense of the word) who's following advice - part of which (quite...

Dear Armo. Thanks so much for your helpful replies. OK, so as I'm obviously very ignorant about all of this: - There is a Honeywell unit on the side of a three way pipe assembly - one pipe coming down (presume hot feed from the boiler) which has a pump on it (which appears to be...

Thanks for this - I wonder though, if I move the valve over manually - to either position - the CH doesn't "kick in" i.e. the boiler doesn't fire. Surely if it's the motor, moving the valve manually would achieve this. Would that not indicate it might be the wall temp. thermostat that's...

Another update: after having emptied the tank of hot water, and following the instructions in the Wiki to set hot water tank temp to 70C and the boiler stat down to 1, I set both the hot water and CH to be on constantly. The rads are now hot (good), the hot water tank is still cold to the...

OK, sorry, will give details. All controllers Honeywell. Boiler is old-style (not Combi) Ideal Classic RS. Have read the Wiki - currently getting some heat (not much !) to rads by turning up water thermostat, turning down boiler stat, and getting heat that way. NB the valve having...

but I have a little bit more information than the original poster. Old fashioned CH system, i.e. hot water tank fed off boiler, not a combi. Hot water kicks in fine, central heating not regardless of thermostat setting. Have taken the motor of the HoneyWell motorised valve off, checked...