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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have 3 wires in my thermostat as follows ;red to r to w to

Customer Question

I have 3 wires in my thermostat as follows ;red to r white to w brown to w2
I cannot get the fan to run and circulate the air in my house .
how do I fix this problem ?
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

You will need a 4th wire to G on thermostat and furnace