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Problem has been identified and solved - there was no water flow through the manifold due to air in the underfloor heating pipes :!: The ASHP side was working perfectly, but it recognised there was no return flow when the manifold called for hot water, and automatically switched off. A...

Thanks for replying Tony. The ASHP seems to be working ok, in that it supplies plenty of hot water, it just isn't supplying hot water to the UFH - obviously I'm no expert, but I don't understand why one aspect is working and the other isn't, that's why I thought/think it's the Heatmiser...

I've had a wet underfloor heating system installed with the UH1-W Heatmiser control system and wireless room thermostats. The hot water is provided by an external air-source heat pump (ASHP) - the controls and hot water cylinder are in the (attached) garage. When I turn a thermostat up in...

Hi, I've just googled 'Heatmiser not working' and found your post from 2011. I don't even know if you're still active on this website, but thought it worth a try. I've got a similar problem now: I've had a wet underfloor heating system installed with the UH1-W Heatmiser control system and...