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No, I've changed the batteries and they're brand new. I've also reset it a few times to see if it works after that but didn't help

Hi. I have been having trouble with my thermostat (Horstmann DRT 2) lately. It does not seem to override the built-in timer programme for the combi heater and does not seem to send a signal across to the combi heater. I am unsure as to whether I should just buy another thermostat and see if that...