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Thanks for your help Mick.

No feed to the white wire. It is fed momentarily when relay cuts in and then out. By linking a 240v feed directly to the white wire it operates the valve, so from that I assume it's the room stat or the relay module or both!

My meter is DC, I'll borrow an AC Meter and get back to you.

Ok will try this and get back to you. Thanks

Yes, I have several meters.

I'm trying to diagnose a problem with my friend's CH. It is a conventional gravity fed system, controlled with a Honeywell ST9400 programmer in conjunction with a HCW 80 room thermostat and HC60NG relay module. The hot water side of things works normally. I've performed the "teach in"...