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Control Service and Troubleshooting
PROBLEM
"LOW SUCTION PRESSURE"
FAULT (CONT'D)
"HIGH DISCHARGE
PRESSURE" FAULT
140
CAUSE
4. TXV defective.
5. Reduced flow of air
through the evaporator.
6. Defective suction pressure
transducer/low pressure
switch or wiring
7. LLSV defective
1. Condenser fans not operating
or operating backwards.
blows air upward.
2. Too much refrigerant.
3. Air in refrigerant system.
4. Defective discharge
pressure transducer.
SOL
4. Replace TXV.
5. Check CFM
6. Replace transducer/low
pressure switch or faulty
wiring. Refer to "Service"
section for pressure/voltage
formula.
7. Replace LLSV
1. Check fan motor, fuses,
and contactors. Assure fan
2. Remove refrigerant.
3. Evacuate and recharge
system.
4. Replace discharge pressure
transducer. Refer to Service
section for pressure/voltage
formula.
CONT'D
YORK INTERNATIONAL
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