Panasonic CU-2TZ41TBE - Page 41

41
Diagnosis
display
Abnormality or
protection control
Abnormality judgment Protection operation Problem Check location
F17
Indoor standby units
freezing abnormality
3 times happen within
40 minutes
-
Wrong wiring and
connecting pipe,
expansion valve
leakage
 Check indoor/outdoor
connection wire and pipe
 Indoor heat exchanger
sensor lead wire and
connector
 Expansion valve lead
wire and connecto
r
F90
Power factor correction
(PFC) circuit protection
4 times happen within
20 minutes
-
Power factor
correction circuit
abnormal
 Outdoor PCB faulty
F91
Refrigerant cycle
abnormality
4 times happen within
60 minutes
-
Refrigeration cycle
abnormal
 Insufficient refrigerant or
valve close
F93
Compressor abnormal
revolution
4 times happen within
20 minutes
-
Compressor abnormal
evolution
 Power transistor module
faulty or compressor lock
F94
Compressor discharge
pressure overshoot
protection
4 times happen within
20 minutes
-
Compressor discharge
pressure overshoot
 Check refrigeration
system
F95
Outdoor cooling high
pressure protection
4 occurrences within
20 minutes
-
Cooling high pressure
protection
 Check refrigeration
system
 Outdoor air circuit
F96
Power transistor module
overheating protection
4 times happen within
30 minutes
-
Power transistor
module overheat
 PCB faulty
 Outdoor air circuit (fan
motor)
F97
Compressor overheating
protection
3 times happen within
30 minutes
- Compressor overheat
 Insufficient refrigerant
F98
Total running current
protection
3 times happen within
20 minutes
-
Total current
protection
 Check refrigeration
system
 Power source or
compressor lock
F99
Outdoor direct current
(DC) peak detection
Continuous happen for
7 times
-
Power transistor
module current
protection
 Power transistor module
faulty or compressor lock