Below tables outlines detail standard wire color codes on Honeywell T87F Thermostat and HVAC.

Wire Color Code Description/Function

Red
Green
Yellow
White
Yellow
Orange
Blue

R
G
Y
W
P
O
B

24VAC Control Power
Fan
Cooling
Heating
Compressor (Heat Pump)
Cooling Aux (reversing valve fail to heat)
Heating Aux (reversing valve fail to cool)



Related Post

9-Pin EGA (Enhanced Graphics Adapter) Connector Pinout
Hybrid Solid State Relay SSR Circuit Diagram
Typical MOSFET Inverter Circuit Diagram
Sony ICF-2010 Headphone Jack Wiring Diagram
Designing 8 Camera CCTV Circuit Diagram using ZXFV302