– 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
∞
= Infinite
