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View the thread, titled "Faulty Danfoss HPA2 zone valves" which is posted in UK Plumbers Forums on UK Plumbers Forums.

Hi,
Seems like both my upstairs and downstairs HPA2 zone valves are on the blink. Every other day one of them doesn't switch off at the thermostat cut off temp and I come home to the Bahamas 😅.
Firstly, is it worth trying to repair them or is the fix only likely to last a short time before needing done again? If that's the case I'll call plumber and get them replaced, but I'd like a little bit of advice first if possible. If I'm getting the plumber in for the work, I'd also like the heating to be controllable whilst away from home (Tado/Hive?). Would installing something like that have any bearing on what kind of zone valves I needed to replace with? I take it I'd still need some kind of zone valves?
Thanks a lot !
 
Regards the Danfoss valves, it’s likely a sticking microswitch, which would usually mean a new actuator (power head).

Regards the tado/hive etc, they operate the existing valves, so you don’t need to worry about that.
 

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Faulty Danfoss HPA2 zone valves
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UK Plumbers Forums
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Ricky Roma,
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