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IX. TROUBLESHOOTING
-17-
Compressor will not run, compressor has no current draw. 1. Main circuit breaker open.
2. Compressor overload tripped.
3. Cabinet temperature satisfied.
4. Wired wrong or faulty connection.
5. INTELA-TRAUL
®
control malfunction
1
.
6. Start component malfunction.
7. Compressor motor windings open.
Compressor will not run, current draw and trips overload. 1. Low voltage.
2. Start component malfunction.
3. Compressor windings shorted.
4. Locked rotor.
5. Excessive discharge pressure.
Compressor short cycles on overload. 1. Low voltage.
2. Low refrigerant charge.
3. Dirty condenser coil and/or filter.
4. Wired wrong or faulty connection.
5. Condenser fan inoperative.
6. Run capacitor malfunction.
7. Start component malfunction.
8. INTELA-TRAUL
®
control malfunction
1
.
9. High head pressure.
Compressor short cycles. 1. Improper air flow over evaporator coil.
2. Low ambient conditions.
3. INTELA-TRAUL
®
control malfunction
1
.
4. Bad sensors.
5. Temp differential set too close.
Continuous unit operation. 1. Loss of refrigerant.
2. Excessive drawer openings.
3. INTELA-TRAUL
®
control malfunction
1
.
4. Broken compressor valves.
5. Very dirty condenser and/or filter.
6. Check the “DL,” if higher than 160F
Compressor run time lengthy. 1. Partial loss of refrigerant.
2. High ambient conditions.
3. Dirty condenser coil or improper air flow over
condenser coil.
4. Excessive product load.
5. Excessive drawer openings.
6. Drawer gasket requires replacement.
7. INTELA-TRAUL
®
control malfunction
1
.
8. Contaminates in refrigeration system.
9. Compressor valve leakage.
10. Inadequate defrost cycle.
Low suction pressure. 1. Capillary tube restricted.
2. Drier plugged.
3. Loss of refrigerant.
4. Poor air flow.
5. Iced evaporator coil.
High head pressure. 1. Improper air flow across condenser.
2. High ambient conditions.
3. Overcharge of refrigerant.
4. Air in system.
5. Dirty condenser coil.
Will not defrost or inadequate defrost. 1. Defrost heater malfunction.
2. Wired wrong or faulty connection.
3. Cabinet air leak.
4. Coil sensor failure.
5. INTELA-TRAUL
®
control malfunction
1
.
Coil icing. 1. Number of defrost cycles too few.
2. Defrost duration too short.
3. Cabinet air leak.
4. Drain tube plugged.
5. Defrost heater not working.
6. Non-frozen product put into cabinet.
7. Coil sensor failure.
The cabinet & coil sensors show high temperature. 1. Sensor needs rreplacing (place sensor tip and
thermometer in ice water. Change sensor ir readings
differ, or if sensor displays -40 02 266).
WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL AND REFRIGERA-
TION SYSTEM TEST OR MEASUREMENTS WHILE POWER IS APPLIED TO THE MACHINE. EXER-
CISE EXTREME CAUTION AT ALL TIMES. IF TEST POINTS ARE NOT EASILY ACCESSIBLE, DISCON-
NECT POWER, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.