Sanyo AHX0752 - Manual (Page 72)

3-10
Trouble Diagnosis
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3. W-2WAY ECO-i Alarm Codes
F06, F23 Alarm
Alarm code F06, F23
Alarm meaning Gas temperature sensor (EXG1) trouble at outdoor heat exchanger 1; Gas temperature sensor
(EXG2) trouble at outdoor heat exchanger 2
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
F07, F24 Alarm
Alarm code F07, F24
Alarm meaning Liquid temperature sensor (EXL1) trouble at outdoor heat exchanger 1; Liquid temperature sensor
(EXL2) trouble at outdoor heat exchanger 2
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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(3) Leakage from the discharge tube check valve
Trouble: Although the other compressor is operating and this compressor is stopped, the
discharge temperature of this compressor rises together with the temperature of the
other compressor.
(4) The ambient temperature around the outdoor unit when it is stopped is 109°F (43°C) or higher.
Correction (1) Replace the sensor.
(2) Replace the outdoor unit PCB.
(3) Repair the refrigerant tubing.
(4) Adjust the amount of refrigerant.
(5) Correct the trouble.
Example (1) Sensor wiring is partially cut.
Notes This alarm does not indicate that the sensor is disconnected.
In order to prevent overheating during operation, the outdoor units in this system will not allow a
compressor to start if the discharge temperature does not decrease while the compressor is
stopped. If a sensor malfunction results in continuous detection of a high discharge temperature,
then the compressor may stop for no apparent reason. The purpose of this alarm is to facilitate
identification of the problem in this case.