Panasonic CS-MRE7MKE Service Manual page 51

Diagnosis Abnormality
display or
LED 6 LED 5 LED 4 LED 3 LED 2 LED 1
protection
control
H33 Indoor /
outdoor
misconnection
abnormality
H36 Outdoor gas
pipe
temperature
sensor
abnormality
H97 Outdoor fan
motor
mechanism
lock
H98 Indoor high
pressure
protection
H99 Indoor
operating unit
freeze
protection
F11 4-way valve
switching
abnormality
F17 Indoor standby
units freezing
abnormality
F90 Power factor
correction
(PFC) circuit
protection
F91 Refrigeration
cycle
abnormality
F93 Compressor
abnormal
revolution
F94 Compressor
discharge
pressure
overshoot
protection
F95 Outdoor
cooling high
pressure
protection
Abnormality Protection
judgement operation
— —
Continuous Heating
for 5s protection
operation only
2 times —
happen within
30 minutes
— —
— —
4 times —
happen within
30 minutes
3 times —
happen within
40 minutes
4 times —
happen within
10 minutes
2 times —
happen within
20 minutes
4 times —
happen within
20 minutes
4 times —
happen within
30 minutes
4 times —
happen within
20 minutes
51
Problem Check location
Indoor and outdoor • Indoor and
rated voltage outdoor units
different check
Outdoor gas pipe • Outdoor gas pipe
temperature sensor temperature
open or short circuit sensor lead wire
and connector
Outdoor fan motor • Outdoor fan
lock or feedback motor lead wire
abnormal and connector
• Fan motor lock or
block
Indoor high pressure • Check indoor
protection (Heating) heat exchanger
• Air filter dirty
• Air circulation
short circuit
Indoor freeze • Check indoor
protection (Cooling) heat exchanger
• Air filter dirty
• Air circulation
short circuit
4-way valve • 4-way valve
switching abnormal • Lead wire and
connector.
Wrong wiring and • Check indoor/
connecting pipe, outdoor
expansion valve connection wire
and pipe
leakage, indoor heat
exchanger sensor • Indoor heat
open circuit exchanger
sensor lead wire
and connector
• Expansion valve
lead wire and
connector.
Power factor • Outdoor PCB
correction circuit faulty
abnormal
Refrigeration cycle • Insufficient
abnormal refrigerant or
valve close
Compressor • Power transistor
abnormal revolution module faulty or
compressor lock
Compressor • Check
discharge pressure refrigeration
overshoot system
Cooling high • Check
pressure protection refrigeration
system
• Outdoor air
circuit