Panasonic U-4LE2E5 Service Manual & Test Run Service Manual page 140

4. 2WAY Alarm Codes
3. Mini VRF Alarm Codes
H02 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
Notes
H03 Alarm (U-4LE2E5, U-5LE2E5, U-6LE2E5)
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
Notes
H03 Alarm (U-4LE2E8, U-5LE2E8, U-6LE2E8)
Alarm code
Alarm meaning
Alarm conditions
6
Probable cause
Check
Correction
Example
Notes
H02
PFC is overcurrent or VDC is overvoltage. (Single phase only)
Overcurrent or overvoltage of DC side
(1) Power supply voltage malfunction
(2) Wiring failure (connection failure, miswiring)
(3) HIC PCB failure
(1) Check the power supply and power wiring.
・Not satisfied with ±10% rated supply voltage
・Extreme voltage fluctuations
・Extreme distortion of voltage waveform
(2) Check the wiring.
・Loose electrical wire connection
・Is HIC PCB connector poorly connected or opened with wire?
(1) Correct the power supply and power wiring.
(2) Correct the wiring failure.
(3) Replace the HIC PCB.
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—
H03
Compressor current sensor is disconnected or shorted.
When the frequency of compressor (INV) is over 35Hz and the secondary current is over 5.0A,
the primary current detected lower than 1.0A.
* No current is detected even though the compressors are operating.
(1) CT failure
(2) HIC PCB failure
(3) Power supply and voltage malfunction
Check the power supply and voltage. 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 if the
compressor starts running.)
(1) Correct the power supply voltage.
(2) Replace the Outdoor Unit Control PCB or the HIC PCB.
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—
H03
Compressor current sensor is disconnected or shorted.
When the frequency of compressor (INV) is over 43.8Hz and the secondary current is over 4.7A,
the primary current detected lower than 0.7A.
* No current is detected even though the compressors are operating.
(1) CT failure
(2) HIC PCB failure
(3) Power supply and voltage malfunction
Check the power supply and voltage. 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 if the
compressor starts running.)
(1) Correct the power supply voltage.
(2) Replace the Outdoor Unit Control PCB or the HIC PCB.
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2WAY SYSTEM
Mini VRF SYSTEM
Trouble Diagnosis
Trouble Diagnosis