Fujitsu B24LDC, Service Instruction

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0.5
sec.
6 times
0.5 sec
2 times
Indoor Fan Lock Error No Display
No Display
The indoor fan speed is 0 rpm after 56 seconds from starting operation or from the time the fan mode was
changed. > Operation stops. (It releases by sending the operation stop signal from the remote controller.)
[Diagnosis Point]
- Fan motor connector loose/ defective contact.
- Fan motor defective.
- Controller PCB defective.
Motor Error
0.5 sec
3 times
Indoor Fan Speed Error
The indoor fan speed is 1/3 of the target frequency after 56 seconds from starting operation or from the time the
fan mode was changed. > Operation stops. (It releases by sending the operation stop signal from the remote
controller.)
[Diagnosis Point]
- Fan motor connector loose/ defective contact.
- Fan motor defective.
- Controller PCB defective.
0.5
sec.
7 times
0.5 sec
2 times
Discharge Temperature
Error
The discharge temperature error is activated. > Permanent stop.
[Diagnosis Poijnt]
- Check if 2 way valve or 3 way valve is left open.
- Heat radiation is blocked (Inlet/Outlet)
- Check if Outdoor Fan is defective (does not rotate).
- Refrigeration cycle defective (Refer to after mentioned “Refrigerant cycle diagnosis”).
Refrigerant
Cycle Error
0.5 sec
3 times
Excessive High Pressure
Protection on Cooling
Excessive high pressure protection on cooling mode has been activated.
> Compressor, Outdoor Fan : OFF (It releases after 3 minute ST)
[Diagnosis Point]
- Heat radiation is blocked (Inlet/Outlet)
- Check if Outdoor Fan is defective (does not rotate).
- Refrigeration cycle defective (Refer to after mentioned “Refrigerant cycle diagnosis”).
0.5 sec
5 times
If the pressure switch is open for 10 sec. when the power is turned on
> Compressor, Outdoor Fan : OFF
[Diagnosis Point]
- Check interruption of heat radiation (Air intake / outlet)
- Check outdoor fan operation (does not rotate)
07
-0
7
Indoor Fan
Pressure Switch Error
When it becomes normal after 10 sec. passed, the operation is resumed based
on serial forward transfer signal.
- Check refrigerant cycle (Refer to "Refrigerant cycle diagnosis" which is described in the later chapter)
0F
24
16