Page 225 - Foton Workshop Manual - Auman EST-M

Diagnosis - Diagnosis-fault diagnosis of electronic and electrical parts DI - 171

Failure phenomenon Possible reason Failure elimination IN
Discharge the refrigerant completely and
1. Air entrained in the system
refill DI
2. Refrigerant (too much) Discharge until suitable amount

Condenser (cooling fin damaged or
3. Condenser sheet (blocked) EG
The pressure of high pressure pipeline of covered with dirt)

refrigeration circulation system is too 4. Condenser fan is not working
Replace the condenser fan
high properly TR
5. Refrigerant pipeline (deformed,
Repair or replace the failed pipeline
damaged)
AX
6. Expansion valve (incorrect Check, repair or replace the expansion

adjustment) valve
FR
Replace the leaking parts and refill
1. Refrigerant (leaking)
refrigerant
The pressure of high pressure pipeline of 2. Compressor pressure relief valve ST
Replace the compressor
refrigeration circulation system is too failure
low 3. Compressor seal ring failure Replace the compressor seal ring
BR
Check, repair or replace the expansion
4. Expansion valve failure
valve
BW
Check, repair or replace the expansion
1. Expansion valve (damaged)
valve
The pressure of low pressure pipeline of
2. Refrigerant (too much) Discharge until suitable amount EL
refrigeration circulation system is too
3. Compressor (damaged) Replace the compressor
high
4. High-pressure pipeline (deformed,
Repair or replace the failed pipeline
blocked)
1. Refrigerant (insufficient) Add refrigerant to the right amount

Check, repair or replace the expansion
The pressure of low pressure pipeline of 2. Expansion valve (blocked)
valve
refrigeration circulation system is too
3. There is air in system Discharge air
low
4. Evaporator temperature sensor Replace the temperature sensor of
(damaged) evaporator

DI-171