Trouble Diagnosis

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

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

Check

(1)

Measure the sensor resistance. Check that the sensor is operating normally.

 

(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

 

 

 

Check

(1)

Measure the sensor resistance. Check that the sensor is operating normally.

 

(2)

Use a remote monitor or a PC monitor to check the temperature that is recognized

 

 

 

 

by the microcomputer.

 

 

 

Correction

—

 

Example

—

 

Notes

—

 

 

 

 

 

 

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Sanyo THX1852, UHX2452, UHX0752, UHX1252 F08, Correction Example, Alarm code F12, F16 Alarm Alarm code, F17 Alarm Alarm code
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