Hi, I'm trying to work out why my Y-Plan heating system is not behaving as expected.
HW works fine. CH will only work if I manually move the lever on the 3 port motorised valve.
I thought this was a problem with the synchron motor, but a replacement has not made any difference.
The steps I have taken and my findings:
If the 3 port valve were jammed, surely I wouldn't be able to open it using the manual lever
I'm stumped so any help would be appreciated!
thanks,
Andrew
wiring centre is Honeywell 42005748-001; Honeywell 3 port motorised valve
HW works fine. CH will only work if I manually move the lever on the 3 port motorised valve.
I thought this was a problem with the synchron motor, but a replacement has not made any difference.
The steps I have taken and my findings:
- Power down whole system to reset (not just at controller)
- Set HW cylinder thermostat to MIN. This gives continuity across Common and #2 (when I set to max continuity is between common and #1)
- I have unwired the room thermostat and hard-wired terminals 1 and 3 as per instructions of wiring centre
- On controller, I set HW and CH to ON. Checked that there is 240V at wiring centre for HW and CH
- Synchron motor does not move; boiler does not come on
- Checked terminals to/from motorised valve at wiring centre - grey and white=240V, orange- nothing.
- Across synchron motor - seems to be 100V AC or 50V AC depending on which connections I connect red/black to
- If I move the manual lever on the motorised valve, the microswitch clicks, the boiler fires up. The valve is open for CH and radiators warm up. The orange wire between wiring centre and motorised valve is now live. No crunching of gears heard whilst lever is moved.
If the 3 port valve were jammed, surely I wouldn't be able to open it using the manual lever
I'm stumped so any help would be appreciated!
thanks,
Andrew
wiring centre is Honeywell 42005748-001; Honeywell 3 port motorised valve