Refrigerator fault finding guide for vapour compression systems
Refrigerator Troubleshooting – Advanced diagnosis vapour compression systems fault finding
Expansion valve capacity too small
1. No subcooling of the refrigerant liquid.
2. The pressure drop across the expansion valve is less than that for which it was dimensioned.
3. Incorrect expansion valve bulb location (too cold or being cooled).
4. Large pressure drop across the evaporator.
5. Expansion valve blocked by ice or foreign objects.
6. Incorrect expansion valve external [...]
Refrigerator Troubleshooting – Visual vapour compression systems fault finding
Visual fault finding
Compressor not running
1. Main supply isolator open.
2. Fuse blown.
3. Overload open circuit.
4. Control circuit open (low pressure switch, high pressure switch or thermostat).
Fixture temperature too high
1. High evaporator load.
2. Defrost heater(s) energized.
3. Condenser blocked with dirt.
4. Restricted air flow over the condenser or restricted water flow.
5. Condenser fan inoperative.
6. Evaporator blocked with ice.
7. [...]