Unified Brands Randell DPM Series, Operator'S Manual

Page: 18 / 26

18 800-621-8560
Trouble Shooting Guide
SYMPTOM POSSIBLE CAUSE PROCEDURE
Unit doesn't run 1. No power to unit 1. Plug in unit (check power switch)
2. Temperature control turned off 2. Check temperature control
3. Temperature control faulty 3. Test temperature control
4. Compressor overheated 4. Clean condenser coil
5. Condenser fan faulty 5. Service condenser fan
6. Overload protector faulty 6. Test overload
7. Compressor relay faulty 7. Test relay
8. Compressor faulty 8. Call ASA for service
Unit short cycles 1. Condenser coil dirty 1. Clean coil
2. Condenser fan faulty 2. Service fan and motor.
3. Compressor faulty 3. Call ASA for service
4. Overload repeatedly tripping 4. Check outlet voltage
5. Check pressure control settings 5. 20 Cut in / 15 Diff
6. Solenoid not seating 6. Call ASA for service
Unit runs constantly 1. Condenser coil dirty 1. Clean coil
2. Condenser fan faulty 2. Service condenser motor
3. Gaskets not sealing 3. Replace gaskets
4. Covers off unit 4. Re-apply covers
Rail not cold
enough/base temp
OK
1. Temperature control set too
high
1. Adjust control to lower setting
2. Temperature control faulty 2. Test control
3. Condenser coil
3. Clean coil
4. Solenoid valve not energized
4. Check t-stat for power to solenoid
5. Refrigerant leaking or
contaminated
5. Call ASA for service
Unit too cold
1. Temperature control set too
low
1. Adjust control to raise setting
2. Temperature control faulty 2. Test control
Base warm/rail temp
is OK
1. Thermostat 1. Test thermostat
2. Evap fan motors 2. test fan motors
3. Solenoid valve 3. Test solenoid valve
Unit noisy
1. Compressor mountings loose
or hardened. 1. Tighten or replace compressor
mountings
2. Condenser fan damaged or
hitting fan shroud
2. Inspect condenser fan
Drawer issues
1. Drawer tracks backwards
1. Check installation of drawer track
– page 12
2. Roller bearings loose 2. Tighten bearings