Hi i've got a central heating systom that only operates if the hot water is selected aswell. I think its probably the 3 port valve but would like to no how to test for this and wether it could be anything else?
cheers
With those symtoms it's almost certain the problem lies within the head of the valve. Ie faulty motor or faulty micro switch.
The room stat is clearly working, otherwise you would not get beyond HW.
However there is a slight chance that it could be a wiring problem.
With both HW and CH off there should be 240v on the grey wire.
Also with HW switched on but satisfied the grey should have 240v.
A quick check will eliminate the wiring. Of course you'll need something to check it with! Do you have a multimeter?
Then you can start reading up all about 3 port valves, or you could just change it.
Yes Ben but! You aint told him which wires to check or under what conditions. I'm not surprised he's confused.
Everythings so simple when you know what your doing.
i give broad directions on purpose. anyone with a basic understanding will then ask a specific question and will get a specific answer. the rest will not understand and give up. so they should, new controls are cheaper than a funeral
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