Friedrich WallMaster WCVT12B30A handleiding

Airco

Friedrich

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DIAG

CODE

PROBLEM

CONDITIONS POSSIBLE CAUSES CORRECTIVE ACTION

18 (CONT)

Inverter

immediate

fault 1

Continued

7802

DC Bus Over

Voltage

The DC voltage on the electrolytic

capacitor exceeds the set limit value

1. After power is on.

2. The DC voltage on the electrolytic

capacitor exceeds the set limit

value.

3. If the above conditions are met. it

will report the fault to Display Board

for 3 minutes continuously.

1. The voltage of power supply is

too high.

1. Power supply voltage > 230 VAC

for 115 V power. 300 VAC for 230V

power.

1. Check wiring and connections from PCB to

compressor.

2. Disconnect the compressor before power up

the unit and check for fault. If fault is removed

replace compressor.

3. Check the voltage of power supply.

4. Check the radiator ventilation is normal.

5. Check whether the IPM is in good contact with

the radiator.

6. Check refrigeration system for abnormalities.

7. Replace Inverter PCB.

8. Replace Compressor.

7803

DC Bus Under

Voltage

The DC voltage on the electrolytic

capacitor is lower than the set limit

value.

1. After power is on.

2. The DC voltage on the electrolytic

capacitor exceeds the set limit value

3. If the above conditions are met. it

will report the fault to Display Board

for 3 minutes continuously.

1. The voltage of power supply is

too low.

1. Power supply voltage < 78 VAC

for 115V power. 120 VAC for 230V

power.

2. PCB is faulty.

7811

Compressor

Power Module

Over Temperature

IPM module temperature exceeds

the set limit value.

1. Detect the fault when the

compressor is running;

2. IPM module temperature exceeds

the set limit value.

3. If the above conditions are

met. the unit will shut down for 3

minutes, error will be reported.

1. The radiator ventilation is

abnormal

2. Poor contact between IPM and

radiator or screws are loose.

3. PCB is faulty.

7815

Pre-Charge Relay

Open

This fault occurs when the voltage

between DC + and DC -is lower than

100V when power on for the ﬁrst

time.

1. Detection at initial power on of

ODU;

2. the voltage between DC + and DC

-is lower than 100V.

3. If the above conditions happed,

error will be reported, and unit will

be shut down.

1. The voltage of power supply is

too low. Power supply voltage

< 70 VAC;

2. PCB is faulty.

7807

PFC Desaturation

1. Detect the fault when the PFC is

on.

2. The AC Peak current is detected

to exceed the set limit value.

3. If the above conditions are

met. the unit will shut down for 3

minutes, error will be reported.

1. The voltage of power supply is

too low or too high.

2. Wiring loose or disconnected.

3. Inverter PCB Faulty.

TROUBLESHOOTING

Diagnostic Codes-Inverter

Figure 604

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