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Johnmdc. So what about the advice to change wire at bother ends?

Ok so can put 2 to A 3 to B Discard 1 thanks very much. Great help

Honeywell it’s T6060

Hi I am wanting to replace my analog thermostat and have purchased the Honeywell DT90 anyone able to say on the old one that the wire in terminal 3(the bottom black wire) is some sort of earth and won’t be needed in my 2 wire digital thermostat otherwords connect red in terminal 1 from old to...