Randell 8148N Operator's Manual page 15

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