Way Alarm Codes - Panasonic U-120ME2U9 Service Manual
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Also See for U-120ME2U9:
- Installation instructions manual (64 pages) ,
- Operating instructions manual (16 pages) ,
- Operating instructions manual (12 pages)
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3. 2WAY Alarm Codes
With types 72 and 96, only one INV compressor is supplied.
With types 120 and 144, two INV compressors are supplied.
Alarm code
E06
Some indoor units does not respond to outdoor unit.
E12
Auto Address failed to start.
E15
Fewer indoor units are found in Auto Addressing than the setting on outdoor PCB.
E16
More indoor units are found in Auto Addressing than the setting on outdoor PCB.
E20
No indoor unit responded in Auto Addressing.
E24
No response from sub outdoor unit.
E25
The outdoor unit address is duplicating.
The number of responding outdoor units does not match with the setting on the main outdoor
E26
unit.
E29
No response from main outdoor unit.
E31
Error in communication inside outdoor unit control box.
F04
DISCH1 thermistor at the discharge of 1st compressor reading is abnormal.
F05
DISCH2 thermistor at the discharge of 2nd compressor reading is abnormal.
F06
EXG1 thermistor at the gas side of 1st heat exchanger of the outdoor unit has failure. (EXG1)
F07
EXL1 thermistor at the liquid side of 1st heat exchanger of the outdoor unit has failure. (EXL1)
F08
TO thermistor for outdoor ambient air temperature has failure. (TO)
F12
SCT thermistor at the suction refrigerant of compressors has failure. (SCT)
F14
SCG thermistor at the outlet of subcooling heat exchanger in outdoor unit has failure. (SCG)
F16
High pressure sensor of the outdoor unit has failure. (HPS)
F17
Low pressure sensor of the outdoor unit has failure. (LPS)
F23
EXG2 thermistor at the gas side of 2nd heat exchanger of the outdoor unit has failure. (EXG2)
F24
EXL2 thermistor at the liquid side of 2nd heat exchanger of the outdoor unit has failure. (EXL2)
F31
EEPROM on outdoor unit PCB has failure.
H01
Overcurrent in 1st compressor.
H11
Overcurrent in 2nd compressor.
H03
Current sensor for the 1st compressor is disconnected or shorted.
DISCH1 thermistor at the discharge of 1st compressor is disconnected, shorted or misplaced.
H05
(DISCH1)
H06
Low pressure is too low.
H07
Low on oil or the oil recovery circuit has restriction.
H08
OIL1 thermistor for the oil of 1st compressor has failure. (OIL1)
H13
Current sensor for the 2nd compressor is disconnected or shorted.
DISCH2 thermistor at the discharge of 2nd compressor is disconnected, shorted or misplaced.
H15
(DISCH2)
H27
OIL2 thermistor for the oil of 2nd compressor has failure. (OIL2)
H31
HIC for 1st compressor has failure. Overcurrent or overheat of HIC.
H21
HIC for 2nd compressor has failure. Overcurrent or overheat of HIC.
L04
Duplicate system address setting on outdoor units.
L10
Capacity setting of outdoor unit is not correct.
L17
Model mismatch between outdoor units in one refrigerant circuit.
L18
Reversing valve or solenoid valve failure.
Alarm meaning
5 - 5
2WAY VRF SYSTEM
2WAY VRF SYSTEM
Trouble Diagnosis
Trouble Diagnosis
Page
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5-8
5-8, 5-9
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5-12
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