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Calling for heat but valve closed

Hi,

I've noticed this on 2 of my TRV's lately.

Seems the TRV's are not telling me that the batterys are low. They will call for heat yet not have the power to open the valve. Once I change the batteries they work again.

I have 5 TRV's and this has happened on 2 of them.

Any ideas why this happens?