Panasonic U-8ME2E8 Service Manual & Test Run Service Manual page 169

4. 2WAY Alarm Codes
3. 2WAY Alarm Codes
H03, H13 Alarm
Alarm code H03, H13
Alarm meaning H03 : Compressor 1 CT sensor disconnected or short-circuit
H13 : Compressor 2 CT sensor disconnected or short-circuit
Alarm conditions Compressor 1, 2: When the frequency of compressor (INV) is over 35Hz and the secondary current
* No current is detected even though the compressors are operating.
Probable cause (1) CT failure
(2) HIC PCB failure
(3) Power supply and voltage malfunction
Check 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.)
Correction (1) Correct the power supply voltage.
(2) Replace HIC PCB.
Example —
Notes —
H05, H15 Alarm
Alarm code H05, H15
Alarm meaning H05 : Compressor 1 discharge temperature sensor disconnected
H15 : Compressor 2 discharge temperature sensor disconnected
Alarm conditions • This alarm occurs when the discharge sensor temperature detector is not inserted into the tube's
sensor holder, or when the sensor itself has suffered some kind of malfunction other than a cut
wire.
• When outdoor air temperature is -10°C or higher:
Alarm occurs if the temperature detected by the discharge sensor has changed by less than
2°C when the compressor has operated for 10 minutes immediately after start.
• When outdoor air temperature is below -10°C:
Alarm occurs if the temperature detected by the discharge sensor has changed by less than
2°C when the compressor has operated for 30 minutes immediately after start.
Probable cause (1) Discharge sensor temperature detector is not inserted into the tube's sensor holder.
(2) Discharge sensor itself has suffered some kind of malfunction other than a cut wire.
Check (1) Check that the discharge temperature sensor is inserted into the sensor holder.
(2) Check that sufficient heat-conducting putty is applied.
(3) Remove the discharge sensor from the sensor holder and expose the sensor to the outside
air for approximately 5 minutes. Check that the temperature detected by the sensor changes
to match the outside air temperature. (However the sensor cannot detect temperatures at or
below 0 °C.)
Correction (1) Install the sensor into the holder, and apply sufficient heat-conducting putty.
(2) If the sensor is malfunctioning, replace it.
—
Example
is over 7.0A, the primary current detected lower than 0.7A.
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2WAY SYSTEM
2WAY SYSTEM
Trouble Diagnosis
Trouble Diagnosis
6