i want to change my potterton pr2t room thermostat to a honeywell dt90e but i have a red yellow and blue wire and the honeywell only takes 2 wires is there anyone that can advise thanks 
changing room thermostat
- Thread starter tonyjones1
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compheat
THe blue wire should be the Nuetral and the other two are both live wires switch L in and back out to your appliance.you just need to see which wire is doing what
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