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Table 8 — Troubleshooting
SYMPTOM PROBABLE CAUSE REMEDY
Compressor Does Not
Run
Main power line open Replace fuse or reset circuit breaker.
Loose terminal connection Check connections.
Improperly wired controls Check wiring and rewire.
Low line voltage Check line voltage; determine location of voltage drop.
Compressor motor defective Check motor winding for open or short. Replace compressor if
necessary.
Seized compressor Replace compressor.
High level gage alarm Check refrigerant level and remove excess.
Compressor Cycles On
High-Pressure Control
High-pressure control erratic in action Check capillary tube for pinches. Set control as required.
Discharge valve partially closed. Open valve.
Air in system Purge system.
Condenser scaled. Clean condenser.
Condenser water pump or fans not
operating.
Start pump or fans.
Unit Operates Too Long Isolation valves partially open Close valves.
System Noises Piping vibrations Support piping as required. Check for loose pipe connectors.
Insufficient compressor oil Add oil.
Compressor Loses Oil Leak in system Locate and repair leak.
Plugged or stuck compressor oil return
check valve
Repair or replace valve.
Liquid refrigerant carries oil out of
compressor
Check to ensure only refrigerant vapor enters compressor suc-
tion line. Add oil as necessary.
Motor shutdown on internal thermal protec-
tion high temperature cutout.
High temperature cutout should reset within 120 minutes.
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