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Trouble Diagnosis
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3. W-2WAY ECO-i 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
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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.
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—
—
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.
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—
—
Correction
Example
Notes
