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Ah. What model can we use? Any idea? Thank you

Sorry good point! Its an L641A. Thank you

We've bought a Honeywell thermostat but are confused about how to wire this. The ESI thermostat cable connection has 4 wires but the Honeywell controller is designed to take 3. I've attached a pic. Can anyone help with this? Thank you v much

Nope it doesnt move. I've ordered a new thermostat. This will be our 3rd one in 2.5 years and our 4th zone valve though. ESI fitted and being replaced with ESI. Advice?

I've ordered a new thermostat..electrician coming wed. Is it ok to run the system in the meantime or will it wreck the zone valve? Thank you

We have replaced the ESI zone valve but the thermostat is clicking back and forward every 2 seconds. Is the thermostat the issue?

Its clicking on and off - or at least it was before it stopped working

I am wondering if our zone valves have been miss wired? I think the last plumber copied the previous wiring. What would be a better replacement brand - honeywell? Thanks for advice!

Thanks for your advice. Is it easy to change to a different manufacturer? The plumber we had last time seemed unkeen to do this. Thanks!

We are in a new build. Boiler 2 5 years old. We have gone through x3 zone controller valves and 2 thernostats. Our boiler is serviced annually- 2 months ago. We have no hot water - thermostat on megaflow gets to 29 degrees and continues to click despite thermostat being set to 55 degrees. Esi...