Hi There,
Many thanks for the quick reply. My relay has been fitted under the boiler......should not have been I think! I'll move it and if it doesn't work, I'm going for a wired in stat. I presume you did the same and it's ok now?
Thanks again
Roy.
I'd be interested to know how this was resolved as I've just had a Baxi Duotec fitted with the same Honeywell controls and I have exactly the problem you raised.