DEVIREG THERMOSTAT

Joined
8 Oct 2026
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United Kingdom
Hello, I am not sure where to post this so I apologize if it is in the wrong place and if so could someone tell me where to post it. I have underfloor heating with DEVIREG thermostats which are rather old and not holding the information. I have opened one up and there is a button battery which I assume is rechargeable. Can someone tell me the type of battery. It is soldered in place and I cannot read what is on it due to a band fixed across it. Thank you all so much
 
Hello, The battery is rechargeable. I have managed to remove it and I now know the voltage. Thank you all for the positive and negative replies.
 
Hello again, I have 7 in total of the DEVI 550 controllers and although they seem to work ok two of them have a flashing black circle. If I run them through the programming the circle stays black as I would expect but if the power is turned off the pulsing black circle is back. Information from the internet indicates a faulty sensor but this cannot be as if I go through the programming procedure the circle stays blacl. Any ideas. Thank you.
 

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