Panasonic U-4LE2E5 Service Manual & Test Run Service Manual page 148

3. Mini VRF Alarm Codes
Example —
Notes —
P16 Alarm
Alarm code P16
Alarm meaning Compressor secondary current is overcurrent.
Alarm conditions This alarm occurs when current trouble or current detection trouble occur
(when trouble judgement current is detected in the secondary current).
*
When more than the current values shown in the table are instantly
detected in the secondary current.
Secondary current
Probable cause (1) Power supply voltage malfunction
(2) Wiring failure (connection failure, miswiring)
Check (1) Check the power supply voltage.
(2) Check the wiring.
Correction (1) Correct the power supply voltage.
(2) Correct the wiring.
(3) Replace the compressor or the HIC PCB.
Example —
Notes When replacing HIC PCB, be sure to attach next radiating putty between the PCB and heatsink.
P20 Alarm
Alarm code P20
Alarm meaning Too high load in refrigerant circuit.
Alarm conditions The high pressure increase is not rapid but the alarm occurs when the horsepower down does
not meet the anticipated time.
Probable cause (1) Forgot to open the valve.
(2) Operation failure of mechanical valve
(3) Idle away of outdoor fan
Check Check the valve, mechanical valve and outdoor fan.
Correction —
Example —
6
Notes —
P22 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
3-2 Since there is no error, see what happens.
3-3 Indoor control board defective
Changed to output error by current regardless of the inverter frequency.
Model name U-4LE2E5 U-5LE2E5
Current (A)
Model name U-4LE2E8 U-5LE2E8
Current (A)
* Wiring between HIC PCB and compressor
Check whether the voltage between each of the phases is correct while the compressor is running.
(It is necessary to check the compressor while running because the voltage may decrease when the
compressor starts running.)
Check whether the following wiring is missing, connection failure or miswiring (position of U, V, W is
properly placed).
・ Wiring between HIC PCB and compressor
・ HIC PCB side
・ Compressor side
P22
Outdoor unit fan motor has failure.
Fan motor start failure, fan motor Hall IC input failure
(1) Wiring failure
(2) Outdoor Unit Control PCB failure
(3) Fan failure
(4) Fan motor failure
(1) Wiring check
1-1 Are the connctors "CN-FM" firmly connected to the Outdoor Unit Control PCB
(lock engaged)?
If "Yes", see "2-1".
If "No", correct the connector connections.
(2) Outdoor fan motor check
2-1 Disconnect the connectors "CN-FM" from the Outdoor Unit Control PCB and rotate the
outdoor fan by hand ; does it rotate freely?
(Check the outdoor fan motor lock)
If "Yes", see "3-1".
If "No", replace the outdoor fan motor.
(3) Outdoor control PC board check
If "No", see "3-2".
replace board
U-6LE2E5
24.5
U-6LE2E8
15.2
6 - 20
Mini VRF SYSTEM
Trouble Diagnosis
HIC PCB
Inverter compressor