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PostPosted: Tue Feb 05, 2019 11:01 am 
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Been getting some weird problems lately with the heating.
(Vaillant Ecotec plus 624)

- Hot water is scheduled to come on 1 hour before radiators, however, all radiators get hot as soon as hot water comes on.
-Also when heating is scheduled to go off the relevant light turns off dead on time but the radiators keep going red hot.
-To turn them off I have to go and manually start and stop the heating a few times from the wall control panel and finally it seems to get the message

Anyone got any ideas what's going on???

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PostPosted: Tue Feb 05, 2019 12:48 pm 
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havent got a clue
perhaps iff you swap hot water for heating when setting the times what happens
sounds like something electrical or mechanical not set up correctly :dunno:

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PostPosted: Tue Feb 05, 2019 1:23 pm 
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Rads getting hot when only water is on - first place to check is the diverter valve.

One day it will all be firewood.

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PostPosted: Tue Feb 05, 2019 2:06 pm 
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Is this system boiler, do you have a hot water tank. It could be a motorised valve not working, or the pump is running due to some PCB issue?

And RGI is probably needed on site to suss this out.


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PostPosted: Wed Feb 06, 2019 12:23 pm 
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I would look for any motorised valves, it could be as simple as some one has latched the lever to bleed position, but normally you can feel the valves move.

In most cases the controller and thermostats tell the valves what is required, and the valves in turn tell the boiler when to run, not always the case with new modulating thermostats but it works that way with most.

With a three port valve it is never off, domestic hot water is default, it moves half way to give both, and all the way to give central heating only, if it sticks open then you could get central heating when set to water. It may even hold micro switch energised and stop boiler switching off.

With two x two port valves there should also be a by-pass valve, again they can stick, and also the micro switches as with 3 port can also stick.

If the system did work OK and now does not it seems likely valve or micro switch inside valve is stuck. In the main you don't change micro switches, you swap whole head, or valve.

As a P.S. in daughters house the valve what faulty when they moved in, micro switches failed, and some one has latched the motorised valve to keep the system running, my son in law tidying caught valve causing central heating to stop, took me ages to work out what had happened, it was a Sunday so plumbing outlets closed, only screwfix open, so had to change whole valve, they did not sell valve heads on their own.

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