– 31 –
NOTE: ALL RESISTANCES SHOWN ARE APPROXIMATIONS
* DC Motors: Resistances should read very high if at all, a lower reading indicates a defective
motor.
Component Checks at Main Board
Thermistors
INDOOR
J502 pin 1 - 2 AIR range 7k ohms to 64k ohms
J502 pin 3 - 4 COIL range 10.5k ohms to 95k ohms
OUTDOOR
J503 pin 1 - 2 AIR range 3k ohms to 28.5k ohms
J503 pin 4 - 5 COIL range 3k ohms to 28.5k ohms
Indoor Fan
Motor
*
J103 pin 1 - 2 Blue to Yellow ∞
J103 pin 3 - 4 White to Black 38.5k ohms approximately
J103 pin 3 - 6 White to Red ∞
J103 pin 4 - 6 Black to Red ∞
Outdoor Fan
Motor
*
J104 pin 1 - 2 Blue to Yellow ∞
J104 pin 3 - 4 White to Black 47k ohms approximately
J104 pin 3 - 6 White to Red 8meg ohms approximately
J104 pin 4 - 6 Black to Red ∞
ICR Pump J305 pin 1 - 2 Yellow to Yellow 260 ohms (230/208 models)
Reversing
Valve Coil
J304 pin 1 - 2 Pink to Pink 1.5k ohms (230/208 models)
Heaters
(230/208
models)
Plug Blue to Brown on relay 21 ohms
Plug Brown to Brown on relay 36 ohms
Plug Yellow to Brown on relay 50 ohms
∞
= Innite
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