Troubleshooting Guide; Self Diagnosis Function - Panasonic CU-2E15LBE Service Manual

17 Troubleshooting Guide

17.1. Self Diagnosis Function (CU-2E15LBE and CU-2E18LBE)
Abnormality or protection control
Diagnosis
display
H11 Indoor/outdoor abnormal
communication
H12 Indoor unit capacity unmatched
H14 Intake air temperature unmatched
H16 Outdoor current transformer
H19 Indoor fan motor mechanism lock
H23 Indoor heat exchanger temperature
sensor
H27 Outdoor air temperature sensor
H28 Outdoor heat exchanger temperature
sensor 1
H30 Outdoor discharge pipe temperature
sensor
H32 Outdoor heat exchanger temperature
sensor 2 (discharge pipe temp)
H34 Outdoor heatsink temperature sensor at
Control Board
H36 Outdoor gas pipe temperature sensor
H37 Outdoor liquid pipe temperature sensor Continue for 2 sec
H39 Abnormal indoor operating unit or
standby units
H41 Abnormal wiring or piping connection
H97 Outdoor fan motor mechanism lock
H98 Indoor high pressure protection
H99 Indoor heat exchanger freeze
protection
F11 Cooling/heating cycle changeover
abnormality
F17 Indoor standby unit freezing
F90 PFC circuit protection
F91 Refrigeration cycle abnormality
Abnormality
judgement
> 1 min after starting Indoor fan operation can
operation start by entering into force
cooling operation
—
—
—
—
Continue for 5 sec
Continue for 5 sec
Continue for 5 sec
Continue for 5 sec
Continue for 5 sec
Continue for 2 sec
Continue for 2 sec
—
—
—
—
—
4 times occurrences
within 30 minutes
—
—
2 times occurrences
within 20 minutes
58
Emergency
Primary location to verify
operation
• Internal/external cable
connections
• Indoor/outdoor PCB
— • Indoor unit total capacity
— • Intake air temperature sensor
(defective or disconnected)
— • Decreased amount of refrigerant
• Outdoor PCB
— • Fan motor
• Indoor PCB
— • Heat exchanger temperature
sensor
(defective or disconnected)
— • Outdoor air temperature sensor
(defective or disconnected)
— • Outdoor heat exchanger
temperature sensor
(defective or disconnected)
— • Outdoor discharge pipe
temperature sensor
(defective or disconnected)
— • Outdoor heat exchanger
temperature sensor
(defective or disconnected)
— • Outdoor heatsink temperature
sensor at control board
(defective or disconnected)
— • Outdoor gas pipe temperature
sensor
(defective or disconnected)
— • Outdoor liquid pipe temperature
sensor
(defective or disconnected)
— • Piping connection error
• Indoor/outdoor connection cable
connection error
— • Wiring or piping connection
— • Outdoor fan motor
— • Air filter dirty
• Air circulation short circuit
— • Insufficient refrigerant
• Air filter dirty
— • 4-way valve
• V-coil
— • Outdoor expansion valve leakage
• Indoor unit pipe temperature
sensor
— • Outdoor PCB
• Outdoor fan motor
— • No refrigerant (3-way valve is
closed)