Panasonic R410A Service Manual page 86

4. Mini VRF Alarm Codes
F07 alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
Notes
F08 alarm
Alarm code
Alarm meaning
Alarm conditions
1
Probable cause
Check
Correction
2
Example
Notes
F12 alarm
3
Alarm code
Alarm meaning
Alarm conditions
Probable cause
4
Check
Correction
Example
5
Notes
6
F07
Liquid temperature sensor (C1) trouble at outdoor heat exchanger
(1) A/D step is 10 steps or less (short circuit).
(2) A/D step is 1014 steps or more (open circuit).
(1) Sensor malfunction (including connector)
(2) PCB malfunction
(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.
—
—
—
F08
Outdoor air temperature sensor trouble
(1) A/D step is 10 steps or less (short circuit).
(2) A/D step is 1014 steps or more (open circuit)
(1) Sensor malfunction (including connector)
(2) PCB malfunction
(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.
—
—
—
F12
Compressor intake temperature sensor trouble
(1) A/D step is 10 steps or less (short circuit).
(2) A/D step is 1014 steps or more (open circuit)
(1) Sensor malfunction (including connector)
(2) PCB malfunction
(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.
— —
—
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5 - 10
Mini VRF SYSTEM
Trouble Diagnosis