Vogt
®
VT Service Manual 7-5
Troubleshooting
ADDITIONAL TROUBLESHOOTING
Low Suction Pressure - Possible causes include:
1. Evaporators froze up
2. Plugged drier
3. Low refrigerant charge
4. Moisture causing freezing @ TXV
5. Low water circulation
6. Faulty TXV
7. Bad hot gas solenoid valve
High Head Pressure - Possible causes include:
1. Plugged condenser
2. Faulty fan motor
3. Faulty fan cycle switch
4. Faulty thermostat at condenser (allowing only one fan to run)
5. Refrigerant overcharge
6. Non condensable present.
7. Electric interruption to condenser (Remote condenser only)
Compressor Oil Pressure Fault - Possible causes include:
1. Faulty oil pressure sensor or module (Sentronic/CoreSense)
2. Clogged oil pump suction screen
3. Low compressor oil
4. Low compressor superheat
Compressor Runs But Condenser Fan Does Not:
1. Faulty fan cycle switch
2. Faulty fan motor
3. Blocked fan blade
4. Electric interruption to condenser (circuit breaker located in condensing unit control panel)
Compressor Will Not Run, Water Pump Runs:
1. Open compressor overload (on VT-40 & VT-60 only)
2. Defective compressor
3. Faulty compressor contactor
Water Pump Will Not Run, Compressor Runs:
1. Faulty pump
2. Electric service interrupted to pump - pump contactor
Pump and Compressor Run with Insufficient Water on the Evaporators:
1. Water system needs cleaning
2. Faulty pump
3. Inadequate water supply
4. Obstructed float assembly
5. Improper float adjustment
Chopper motor Fault:
1. Bad chopper motor
2. Bad chopper motor contactor
3. Machine Froze up
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