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Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 21805
Experience:  40+ yrs. experience as a licensed oil & gas technician.
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I'm replacing an old Honeywell thermostat. There are no

Customer Question

I'm replacing an old Honeywell thermostat. There are no markings on the thermostat. How do I know which wire to connect to which terminals on the new one?
Submitted: 1 year ago.
Category: HVAC
Expert:  Rick replied 1 year ago.

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can

continue our conversation.

How many wires do you have?

Customer: replied 1 year ago.
Expert:  Rick replied 1 year ago.

Ok, then you put the red on on R(h) and the other on W.

Customer: replied 1 year ago.
The wires are blue and white
Expert:  Rick replied 1 year ago.

Blue on R(h) and white on W. The standard colors are red & white but not every electrician uses the standard.