Panasonic U-4LE2E5 Service Manual & Test Run Service Manual page 137

3. Mini VRF Alarm Codes
F06 Alarm
Alarm code F06
Alarm meaning Outdoor unit heat exchanger gas temperature sensor has failure. (EXG)
Alarm conditions (1) Short circuit (A/D step is 10 steps or less)
(2) Open circuit (A/D step is 1014 steps or more)
Probable cause (1) Sensor malfunction (including connector)
(2) The Outdoor Unit Control PCB malfunction
Check (1) Measure the sensor resistance. Check that the sensor is operating normally.
(2) Use a remote controller monitor or PC monitor to check the temperature that is recognized by
the microcomputer.
Correction —
Example —
Notes —
F07 Alarm
Alarm code F07
Alarm meaning Outdoor unit heat exchanger liquid temperature sensor has failure. (EXL)
Alarm conditions (1) Short circuit (A/D step is 10 steps or less)
(2) Open circuit (A/D step is 1014 steps or more)
Probable cause (1) Sensor malfunction (including connector)
(2) The Outdoor Unit Control PCB malfunction
Check (1) Measure the sensor resistance. Check that the sensor is operating normally.
(2) Use a remote controller monitor or PC monitor to check the temperature that is recognized by
the microcomputer.
Correction —
Example —
Notes —
F08 Alarm
Alarm code F08
Alarm meaning Outdoor temperature sensor has failure. (TO)
Alarm conditions (1) Short circuit (A/D step is 10 steps or less)
(2) Open circuit (A/D step is 1014 steps or more)
Probable cause (1) Sensor malfunction (including connector)
(2) The Outdoor Unit Control PCB malfunction
Check (1) Measure the sensor resistance. Check that the sensor is operating normally.
(2) Use a remote controller monitor or PC monitor to check the temperature that is recognized by
the microcomputer.
Correction —
Example —
Notes —
F12, F14 Alarm
Alarm code F12, F14
Alarm meaning F12 : Compressor inlet temperature sensor has failure. (SCT)
F14 : Subcooling heat exchanger temperature sensor has failure. (SCG)
Alarm conditions (1) Short circuit (A/D step is 10 steps or less)
(2) Open circuit (A/D step is 1014 steps or more)
Probable cause (1) Sensor malfunction (including connector)
(2) The Outdoor Unit Control PCB malfunction
Check (1) Measure the sensor resistance. Check that the sensor is operating normally.
(2) Use a remote controller monitor or PC monitor to check the temperature that is recognized by
the microcomputer.
Correction —
Example —
Notes —
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Mini VRF SYSTEM
Trouble Diagnosis
6