Vaillant Ecotec Plus - CH does not switch off

Joined
29 Dec 2007
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London
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United Kingdom
CH continues on even after HW and CH switched off at programmer and thermostat turned right down.
Replaced CH motor valve (Sunvic SZ2301) and system was switched off upon going live but after testing the system stayed on again. Changed room thermostat but made no difference.

Any ideas?
 
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You should have given us the model number but I am guessing its a 600 series system boiler.

Presumably the problem is external to the boiler and caused by the motor valve continuing to give a switched live on its orange wire which keeps the boiler going.

The only way that I can see that its going to identified is to follow the live call for heat through and see where its staying on when it should be off.

Its likely to be something very simple for an engineer to see but you may have more trouble finding it.

Tony
 
If this is a new boiler, has the link been removed between terminals 3 and 4?

Do you have a multimeter?
 

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