Panasonic U-8ME1E8E Service Manual page 165

4. 2WAY Alarm Codes
L10 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
Notes
L17 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
Notes
L18 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
6
Notes
P02 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
Notes
L10
Outdoor unit capacity not set
The outdoor unit capacity has not been set, or the setting is not allowed by the system.
This alarm occurs because the capacity has not been set.
Connect the outdoor unit maintenance remote controller. On the outdoor unit EEPROM detailed
setting mode screen, check the value for the outdoor unit capacity (item code 81).
Check that it is not set to "0" or to a capacity that is not allowed.
If item code 81 is incorrect, use the outdoor unit maintenance remote controller and set it
correctly.
* After changing the setting, be sure to reset both the indoor and outdoor power.
—
The outdoor unit maintenance remote controller is required in order to set the capacity in the
outdoor unit EEPROM.
L17
Outdoor unit model mismatch
This alarm occurs when a unit other than a R410A refrigerant model is connected.
(1) A unit that uses R407C refrigerant, or a R22 model unit, was connected by mistake.
(2) The connected unit is correct, however the refrigerant type setting in the outdoor unit
EEPROM (item code 80) is incorrect.
(1) Check the refrigerant type at the connected unit.
(2) Use the outdoor unit maintenance remote controller and check the item code 80 refrigerant
type. If the setting is incorrect, change it to R410A.
—
—
The outdoor unit maintenance remote controller is required in order to set the refrigerant type in
the outdoor unit EEPROM.
L18
4-way valve operation failure
During heating operation (Comp. ON), the highest detected temperature at an outdoor unit
heat exchanger (EXG 1, EXG 2, EXL 1, or EXL 2) was 20°C or more above the outdoor air
temperature (Air Temp.) continuously for 5 minutes or longer, or the detected suction
temperature (SCT) was 20°C or more above the outdoor air temperature continuously for
5 minutes or longer.
(1) The 4-way valve connector (20S CN022) has become disconnected from the control PCB.
(2) The 4-way valve circuit is locked (malfunctioning).
(1) Check the 4-way valve connector (20S CN022).
(2) If the connector is normal, check the 4-way valve wiring and the PCB circuit.
If the connector is normal, correct or replace the problem locations.
—
—
P02
Compressor thermal protector is activated. (trip only and no alarm)
When the current is not detected over 4 seconds long after the compressor ON.
Activating condition of the compressor thermal protector (The voltage is more than 260V or
less than 160V between L and N phase.)
(1) Check the constant speed compressor.
(2) Check the current transformer.
Put the constant speed compressor OFF over 60 minutes and cool the thermostat.
Replace defective parts with new ones.
—
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2WAY SYSTEM
Trouble Diagnosis