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2-WAY MULTISET VRF SYSTEM
Trouble Diagnosis
7
1.
2WAY VRF DCI
Alarm Codes
F08
Alarm meaning
Outdoor air temperature sensor (AIR TEMP) trouble
Alarm conditions
(1) A/D step is 10 steps or less (short circuit).
(2) A/D step is 1014 steps or more (open circuit)
Probable cause
(1) Sensor malfunction (including connector)
(2) 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
Alarm code
F12
Alarm meaning
Compressor intake temperature sensor (SCT) trouble
Alarm conditions
(1) A/D step is 10 steps or less (short circuit).
(2) A/D step is 1014 steps or more (open circuit)
Probable cause
(1) Sensor malfunction (including connector)
(2) 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
—
F16 Alarm
Alarm code
F16
Alarm meaning
High-pressure sensor (HPS) trouble
Alarm conditions
(1) Sensor short circuit
(2) Sensor open circuit
Probable cause
(1) Sensor malfunction (including connector)
(2) PCB malfunction
(1) Measure the sensor resistance. Check that the sensor is operating normally.
Check
(2) Use a remote monitor or a PC monitor to check the temperature that is recognized
by the microcomputer.
—
—
—
Correction
Example
Notes
F17 Alarm
Alarm code
F17
Alarm meaning
Low-pressure sensor (LPS) trouble
Alarm conditions
(1) Sensor short circuit
(2) Sensor open circuit
Probable cause
(1) Sensor malfunction (including connector)
(2) PCB malfunction
(1) Measure the sensor resistance. Check that the sensor is operating normally.
Check
(2) Use a remote monitor or a PC monitor to check the temperature that is recognized
by the microcomputer.
—
—
—
Correction
Example
Notes
