Recent content by An.Dee

Thank you for your reply. I have read black wires used to be neutral, but was unsure on the grey, and having seen pictures of of these thermostats being wired up totally incorrect, I wanted to check before attempting. I shall look for blue sleeving when I take the thermostat apart, and label...

Hi, I am planning to upgrade my Honeywell T40 Thermostat to a T4. I believe the T40 is usually a two and the T4 is a two wire. However I have 4 wires in my current T40, I believe I only use wires T1 and T3 into the new thermostat, which is straight forward. My concern is that my current T3...