Specifications

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Troubleshooting 145
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(V2819)
The suction
pipe temperature minus
coil temperature is 68˚F
or higher.
Resistance
is normal when
measured with the
suction pipe thermistor
(R2T) and coil thermistor
(R4T) disconnected from
the outdoor unit PC
board.(3.5kΩ
to 360 kΩ)
Out of gas or refrigerant
system is clogged. Requires
check of refrigerant system.
Replace the thermistor.
Replace the outdoor unit PC
board (A1P).
YES
NO
NO
Out of gas, closing of stop
valve or refrigerant system is
clogged.
Replace main outdoor unit
PC board (A1P).
YES
YES
NO
Cooling
Low pressure
is 15 psi
or less.
The
voltage
of X45A pins (2)
and (3) on main
outdoor unit PC board
(A1P) is 0.8 VDC or less.
(Low pressure
sensor output
voltage)
NO
NO
YES
YES
Replace low pressure sensor.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.