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Troubleshooting Outdoor Components
4-Way Valve Troubleshooting
Heating Mode
Cooling Mode
Checking the 4-way valve in cooling mode requires
the measurement of 4 readings. First record the
temperature of the compressor discharge tubing,
secondly record the temperature of the tubing go-
ing to the condenser. ere should be no more than
a 10 degrees dierence between the two readings.
e next set of readings will require recording
the temperature of the tubing going to the suc-
tion line and the temperature of the tubing going
to the accumulator. Again, if there should be less
than 10 degrees dierence between these readings.
A temperature reading higher than 10 degrees may
indicate a leaky valve (not fully shier) or a block-
age in the valve.
Checking the 4-way valve in heating mode re-
quires the measurement of 4 readings. First re-
cord the temperature of the compressor discharge
tubing, secondly record the temperature of the
suction line tube. ere should be no more than a
10 degrees dierence between the two readings.
e next set of readings will require recording the
temperature of the tubing going to the condens-
er coil and the temperature of the tubing going
to the accumulator. Again, if there should be less
than 10 degrees dierence between these readings.
A temperature reading higher than 10 degrees may
indicate a leaky valve (not fully shier) or a block-
age in the valve.
Compressor
Discharge
To Condenser
Coil
Compressor
Discharge
Suction Line
To Accumulator
Suction Line
To Accumulator
To Condenser
Coil
4-Way valve solenoid resistance check:
Be sure all power is o to the unit. Remove the plug connecting the 4-way vale to the circuit board. Check the
resistance with an ohmmeter. e reading should indicate 1.8k Ω. If the reading is infinite, replace the solenoid
coil.
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