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8. TROUBLE SHOOTING TABLE AND TROUBLE SHOOTING TREES
Symptoms
Compressor is
1. Main switch is disconnected
not run
2. Fuses are blown.
3. Thermal overload is tripped.
4. Magnetic contactor /coil is out of order
5. System shut down by safety devices.
6. Liquid line (or solenoid valve) is not
open.
7. Compressor Motor drive.
8. Loosened wiring.
9. (of 3 Phase system), Phase may be
lost.
Compressor is
1. Liquid refrigerant returns into
unusually
crankcase.
sounded or
2. Refrigerant Pipe is not well erected
vibrated
3. Compressor mechanism loosened.
4. Internal balance springs or Neoprene
choke are broken
High
1. Condensation fail
discharge
2. System is overcharged refrigerant.
pressure
3. Fan is off
4. Condenser fins are dusty
Low
1. Compressor valve is damage
discharge
2. Insufficient refrigerant in system.
OASMs-616-C-19-07-05/13/1/07
Possible Cause
KOLDTECH
The Technology of Excellence
Actions
1. Close switch properly.
2. Check electrical circuit and motor
winding for shorted or grounded.
Investigate for possible overloading.
Replace fuse after fault is re-corrected.
3. Overload is automatically reset. Check
unit closely when unit resumes normal.
4. Repair or replace.
5. Determine type and cause of shutdown
and correct it before resetting safety
switch.
6. Check TXV, (Repair or replace coil.)
7. Check motor if opens windings, short
turn or burnt and disconnected.
8. Check all wires termination. Tighten all
the loosened screws.
9. Test all conductors continuity.
1. Check setting of expansion valves.
2. Provide proper fastener
3. Repair.
4. Replace.
1. Rectify cause of fails
2. Remove the excessive
3. Check electrical circuit.
4. Clean.
1. Check compression ratio or open it.
2. Check leaking and recharge refrigerant
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