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Service Manual
They should be almost the same, if they're with big difference, the compressor is damaged, please check the insulation
condition of three phases to the case.
11. HC: PFC protection
Main check points:
a. Check if the unit voltage input is normal;
b. Check if the inductance wire is well connected;
c. If the above two issues are normal, please replace the ODU mainboard.
12. H7: Compressor out-of-step malfunction
Main check points:
a. Check if the system pressure is too high?
b. Check if the working voltage is too low?
13. Lc; Compressor startup failure
Main check points:
a. Check if the compressor wiring connection is well connected;
b. Check if the compressor startup interval is over 3 minutes, if not, please water for 3 minutes than turn on the unit;
c. Check if there's too much refrigerant.
d. Check if the compressor is damaged, measure the resistance between any two phase of the three phases, they should be
almost the same, if they're with big difference, the compressor is damaged, please check the insulation condition of three
phases to the case.
14. PU: ODU capacitor charging malfunction
Malfunction description: after the unit is energized, before the compressor starting operation, the electrolytic capacitor on
mainbiard should be charging. After the charging command is received, if it is detected by chip that the voltage of electrolytic
capacitor is low, it is ODU capacitor charging malfunction.
Main check points:
a. Check if the unit voltage input is within normal range.
b. Check if the electric reactor connection wiring and capacitor connection wiring is well connected, if the electric reactor is open
circuit.
c. If above two issues are normal, please replace ODU mainboard.
15. P7: Module temp. sensor circuit malfunction
Malfunction description: There's a thermal resistance on top of IPM module, for detecting the module surface temperature, if it is
detected by chip that the temperature is over the normal range.
Main check points:
a. The circuit on mainboard is damaged, please replace the ODU mainboard.
16. P8: Module temperature too high protection
Main check points:
a. After daubing radiating glue on IPM module, fix it with screw, if the glue is aging or the fixing screw is loosened, please daub
the glue again or fix the screw and test again, if the malfunction still exist, please replace the mainboard.
17. PH: ODU DC bus bar voltage too high
Malfunction description: When it is detected the voltage of DC bus bar on electrolytic capacitor is over 420V.
Main check points:
a. Check if the input voltage is too high that out of normal power supply voltage range.
18. PL: ODU DC bus bar voltage too low
Malfunction description: When it is detected the voltage of DC bus bar on electrolytic capacitor is less than 200V.
Main check points:
a. Check if the input voltage is too low that out of normal power supply voltage range.
19. PU: Charging circuit malfunction
Malfunction description: The DC bus bar voltage is less than 100V during charging.
Main check points: Check if the circuit wiring connection is loosened or correct as wiring diagram, well connect the wire, if the
malfunction still exist, please replace the mainboard.
Installation and Maintenance
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