Fujitsu AG * V12LAC Series, Service Instruction

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Self - diagnosis function and Checking points
Error Indication
Operation
(RED)
Timer
(GREEN)
10°C HEAT
(ORANGE)
Error
(Protection)
Diagnosis Method
0.5 sec
7 times
07
-0
7
0.5 sec
2 times
0.5 sec
3 times
Wired remote
controller
OFF
0.5 sec
8 times
0.5 sec
4 times
OFF
OFF
0F
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Discharge temperature
error
The discharge temperature error is activated. > Permanent stop.
[Diagnosis Point]
[Diagnosis Point]
[Diagnosis Point]
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”).
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)
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”).
PFC circuit Error
Excessive voltage of DC voltage on PFC circuit in Inverter PCB is detected, or the excessive current in the circuit is detected.
> Permanent stop.
Controller PCB defective. (Refer to after mentioned “PFC circuit diagnosis”)
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