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Hi Dan, No rads get hot, the valves are all close, the only rad that gets hot is a downstairs toilet towel rail, that has no thermostat its not zoned, None of the rooms are calling for heat. The relay just switches on for a minute or so and then back off

I have optimization switched off to keep it simple and have built the system manually, several times! this still does not explain the relay randomly switching on and off, I am pretty close to having it all taken out to be honest.

Thanks for the reply, I don't think its an install issue, the wiring for a Y valve is very simple, I have followed the Evo instructions exactly (page 47 Fig 10), the relay only requires a supply and has switched O/P I don't think it could be wired wrongly to cause it to randomly active / de...

I fitted a Home Evo system 2 weeks ago, I have a Y plan system, using 2 BDR 91s one for hot water, one for heat. The heat relay continually switches on and off, it responds to a heat demand but may switch back off after only a few seconds, the boiler is on and off all night, off for around 15...