– 31 –
NOTE: ALL RESISTANCES SHOWN ARE APPROXIMATIONS
* DC Motors - Resistances should read very high if at all, lower readings indicate a defective
motor.
∞
= Infinite
Component Checks at Main Board
Thermistors
INDOOR
J502 pin 1 and pin 2 AIR range 7k ohms to 64k ohms
J502 Pin 3 and pin 4 COIL range 10.5k ohms to 95k ohms
J502 Pin 5 and pin 6 OUTLET range 35k ohms to 300k
ohms
OUTDOOR
J503 pin 1 and pin 2 AIR range 3k ohms to 28.5k ohms
J503 Pin 4 and pin 5 COIL range 3k ohms to 28.5k ohms
Indoor Fan
Motor
*
J103 pin 1 and pin 2
blue
to
yellow
∞
J103 Pin 3 and pin 4
white
to
black
38.5k ohms
approximately
J103 pin 3 through pin 6
white
to
red
∞
J103 pin 4 through 6
black
to
red
∞
Outdoor Fan
Motor
*
J104 pin 1 and pin 2
blue
to
yellow
∞
J104 Pin 3 and pin 4
white
to
black
47k ohms
approximately
J104 Pin 3 through pin 6
white
to
red
8meg ohms
approximately
J104 Pin 4 through pin 6
black
to
red
∞
ICR Pump
J305 pin 1 and pin 2
yellow
to
yellow
~ 335 ohms (265
models)
Reversing
Valve Coil
J304 pin 1 to pin 2
blue
to
blue
~ 3.23k ohms (265 models)
Heaters
(230/208
models)
Plug
blue
to
brown
on relay 26 ohms
Plug
brown
to
brown
on relay 46 ohms
Plug
yellow
to
brown
on relay 65 ohms