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I have 4 wires coming from the wall. goes to W. Red goes to…

Customer Question
I have 4 wires coming...
I have 4 wires coming from the wall.
White goes to W.
Red goes to R.
Yellow goes to Y.
where does blue go? there is no corresponding letter.
Honeywell model TH8110U1003.
Submitted: 2 years ago.Category: HVAC
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Answered in 2 minutes by:
1/26/2016
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago
Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 24,621
Experience: 40+ yrs. experience as a licensed oil & gas technician.
Verified

Where did it go on the old thermostat? If you don't know then you need to go to the thermostat terminal strip on the furnace and see where it's connected.

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