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NOTE: ALL RESISTANCES SHOWN ARE APPROXIMATIONS
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Component Checks at Main Board
Thermistors
INDOOR
J29 pin 1 and pin 2 AIR range 7k ohms to 64k ohms
Pin 3 and pin 4 COIL range 10.5k ohms to 95k ohms
Pin 5 and pin 6 OUTLET range 35k ohms to 300k ohms
OUTDOOR
J30 pin 1 and pin 2 AIR range 3k ohms to 28.5k ohms
Pin 4 and pin 5 COIL range 3k ohms to 28.5k ohms
Indoor Fan Motor
*
J2 pin 1 and pin 2 blue
WR\HOORZ
Pin 3 and pin 4
ZKLWH
to black 38.5k ohms approximately
pin 3 through pin 6
ZKLWH
to red
pin 4 through 6 black to red
Outdoor Fan Motor
*
J3 pin 1 and pin 2 blue to
\HOORZ
Pin 3 and pin 4
ZKLWH
to black 47k ohms approximately
Pin 3 through pin 6
ZKLWH
to red 8meg ohms
approximately
Pin 4 through pin 6 black to red
ICR Pump
J23 pin 1 and pin 2
\HOORZ
to
\HOORZ
~ 335 ohms (265
models)
Thermal fuse/In-line fuse
J21 pin 1 to black on Capacitor .001 ohms
Reversing Valve Coil
J22 pin 1 to pin 2 blue to blue ~ 3.23k ohms (265 models)
Heaters (230/208 models)
Plug blue to
EURZQ
on relay 26 ohms
Plug
EURZQ
to
EURZQ
on relay 46 ohms
Plug
\HOORZ
to
EURZQ
on relay 65 ohms