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"Are you saying that, with the central heating off, when you manually switch on the hot water, then increase the temperature setting on the Cylinder Thermostat, the heating comes on?" That is exactly what was happening. I have had my local 'plumber' round and he looked at the electrics with...

ok thanx for that. I will wait for the plumber to come back and see what he says. Not really confident enough to mess about with it myself. One question when heating is on, should the water in the tank also heat up as this is what is happening at the moment I think. My old system (back...

Hi thanx for the reply! Yes this still happens when room stat is set to zero and set to HW only Honeywell ST6400C Timer Honeywell Stat. Plumber replaced just the electrical part is this the powerhead? (square metal box) he did not change the valve itself. The problem is...

Hi all, Had a problem for a wee while now where turning the hot water only on also turns the central heating on? Room stat comes on etc. Strangely this only seems to happen when the hot water tank is not satisfied. ie. if I turn the tank thermo up a bit. Fed up with my local plumber as he...

Ok - Isolated spur you can hear the valve move to relaxed position lever has resistance. Heating off - HW on - lever goes loosealthough moving the stat seems to have no influence on resitance amount.

OK - Just turned Heating and HW off (no light on stat) Lever very loose Turned HW on only (stat light comes on) Lever still very loose in all positions of stat :(

Never used one I am ashamed to say :oops: You don't suspect the actuator then?

YES

That seems to have given some resistance to the lever. However the problem persists. As stated there is a mechanical, quite quiet clicking (switching) sound every second or so coming from the actuator (when switched to water only) almost as though something is trying to engage . . . the...

The thermostat works as expected in the Heating only postion. No problems there. As soon as HW is turned on the light on the hermostat stays on even if turning down to Zero. ( normally this would turn off at room temp) :?

Wow that was quick! Yes the mechanism feels very light (almost loose to the touch) Doesn't seem to be engaging at all - I remember this feeling quite stiff to move on my previous system! The heating works as expected. 1 thermostat downstairs. The heating and water will work together...

Hi all, New here so any advice greatly appreciated! I have a fairly new Condensing Boiler / Water tank system in a conventional 2up 2down mid terrace. Typically just as the guarantee runs out I have a problem! The heating works as expected but suddenly when switching just the hot water on the...