Panasonic U-4LE1E5 Service Manual page 122

3. Mini VRF System Alarm Codes
P05 Power Supply Error
1. Error Detection Method
• Instantaneous blackout
• Zero-cross (waveform input of power supply) error
• DC voltage charge failure
2. Error Diagnosis
Note : The work involved in diagnosing each of the items is extremely dangerous, so turn the power off at the breaker before
performing the tests.
1 Check
the power
1-1
supply &
the wiring
1-2
1-3
1-4
2 Check the
outdoor
2-1
unit CR
PC board
3 Check the
3-1
outdoor
unit HIC
PC board
3-2
5
4 Final check 4-1
Single-phase outdoor unit HIC PC board
Common in RE1 and RE2
*
4hp, 5hp: Plug-in type
6hp: Fastening screw type
Is the voltage on each of the
terminal boards within + 10%
of the rated voltage?
Power wiring N-phase is connected.
Power wiring L2 and N are reverse connected.
Turn the power back on and check again.
Is the alarm triggered again?
The connector CN-PRY2 on the outdoor CR PC board is
connected properly (locked).
Are the wires (RE1, RE2) from the reactor firmly installed?
Turn the power back on and check again.
Is the alarm triggered again?
There may be a instantaneous blackout failure.
If there is nothing abnormal, see what happens.
1-4 : Single-phase model
Yes
1-2 : 3-phase model
Check for open circuit and the voltage at the breaker.
No
if a problem is found, fix it and check again.
3-phase outdoor unit HIC PC board
RE1*
RE2*
(for 3-phase outdoor unit CR PC board)
5 - 42
Mini VRF SYSTEM
Trouble Diagnosis
Yes Correct wiring
No 1-3
Yes Correct wiring
No 1-4
3-1 : Single-phase model
Yes
2-1 : 3-phase model
No 4-1
Yes 3-1
Correct wiring
No
(connector)
Yes 3-2
No Correct wiring
Replace the outdoor
Yes
unit HIC PC board.
No 4-1
CN-PRY2
RE1
RE2