My system is fully pumped, and it has had a new three port valve installed (Honeywell), the central heating no longer comes on independently from the hot water, and although the programmer is set to CH off, the rads heat up as soon as the boiler fires up for the hot water. Could this be a cross wire?? Or something more. I've recently had a new pump fitted (grundfos), which seems to be fine, and a new room stat (Honeywell) which has power getting to it etc. but neither fires up the boiler when room cold, nor switches it off when room warm. This has been going on for weeks, so please help.
please help!!!
- Thread starter shiona
- Start date
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check the wiring 
W
wilhelm
valve wrong way round
port a should be ch. i think.
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