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Honeywell thermostat cm921
We replaced the batteries in the Honeywell CM921 Thermostat and it has n't worked since.
The lights are on the thermostat and it appears to be OK. The boiler will work too if you manually turn it on but not the installed programmes. i.e. the heating does n't come on and off automatically at the required times. We tried changing the batteries again but still no joy. Please help if you can. |
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