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Mini VRF SYSTEM
Trouble Diagnosis
6
3. Mini VRF Alarm Codes
F06 Alarm
Alarm code F06
Alarm meaning Gas temperature sensor trouble at outdoor heat exchanger
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 Liquid temperature sensor trouble at outdoor heat exchanger
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 air temperature sensor trouble
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 Alarm
Alarm code F12
Alarm meaning Compressor intake temperature sensor trouble
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 —
SM830289-00_Sec6.indd 9SM830289-00_Sec6.indd 9 2021/01/29 16:15:412021/01/29 16:15:41
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