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Thanks Simon for this advice. I have now changed this device for a different model and now everything is fine.

Thanks for the messages. I also contacted Horstmann and they sent me a conversion table for a number of different thermostats. On closer examination, my Honeywell thermostat is a T6160B model. Their table states that the T6160B should have four wires connected, with 1 being Common, 2 being...

Hi I am in the process of replacing an old Honeywell room thermostat (no model number but probably about 25 years old) with a digital programmable thermostat from Horstmann (Centaurstat 7). There are three wires for the existing thermostat (red on 1, blue on 2 and yellow on 3). Reading...