Sanyo CHDXR09663, CHDXR07263, CHDX09663, CHDX07263 service manual F04, F05 Alarm Alarm code

Models: CHDXR07263 CHDXR09663 CHDX07263 CHDX09663

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4. W-2WAY ECO-i Alarm Codes

W-2WAY ECO-i SYSTEM Trouble Diagnosis

F04, F05 Alarm

 

 

Alarm code

F04, F05

 

 

 

 

 

 

 

Alarm meaning

Compressor 1 discharge temperature sensor trouble, compressor 2 discharge temperature

 

 

 

sensor trouble.

 

 

 

Alarm conditions

(1) Discharge temp. of 212°F or higher was detected 20 minutes or more after that compressor

 

 

 

stopped operating.

 

 

 

 

(2) Discharge temp. of 158°F or higher was detected after all compressors had been stopped for

 

 

 

60 minutes or longer.

 

 

 

 

(3) A/D step is 10 steps or less (short circuit).

 

 

Probable cause

(1) Sensor malfunction

 

 

 

 

• Sensor element malfunction

 

 

 

 

• Sensor wiring is partially disconnected, resulting in increased electrical resistance.

 

 

 

This alarm does not occur when the wiring is cut or when the connector is not connected to

 

 

 

the outdoor unit PCB.

 

 

 

 

(2) Crossed wiring or installation error

 

 

 

• The discharge temperature sensor of that compressor is connected to the discharge tube

 

 

 

of the other compressor.

 

 

 

 

• The connector for the discharge temperature sensor of the problem compressor is

 

 

 

connected to the outdoor unit PCB connector for the other compressor.

 

 

 

(3) Outdoor unit PCB failure

 

 

 

 

(4) The check valve on the discharge tube for that compressor is wet.

 

 

 

(5) An air short blockage in the area around the outdoor unit has increased the outdoor unit

 

 

 

ambient temperature, reducing the cooling effects after the compressor stops.

 

 

 

(6) There is a cause that results in P03, P17, or P02 alarm.

 

 

 

(7) Electrical noise

 

 

 

Check

(1) Sensor malfunction and outdoor unit PCB failure

 

 

 

Trouble: • Constantly indicates a high temperature.

 

 

 

• When monitoring software or other means are used for monitoring, the discharge

 

 

 

temperature at times fluctuates suddenly and wildly.

 

 

 

• In some cases, the precise temperature may not be known, even when monitoring

 

 

 

software is used.

 

 

 

 

Check: • Wiggle the sensor and check whether the trouble continues.

 

 

 

• Check whether the connector is partially disconnected from the PCB.

 

 

 

An F04 alarm will not result if the connector is completely disconnected (circuit is

 

 

 

open).

 

 

 

 

• If the cause is still uncertain, check the following to determine whether a sensor or

 

 

 

 

 

 

PCB failure has occurred.

 

 

 

Step 1: Connect the other compressor discharge sensor, or a discharge sensor where

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the F04 alarm has not occurred, to the connector for this compressor on the

 

 

PCB. Measure the temperature at the same point (a location where temperature

 

 

 

fluctuations are small), and check whether there is a temperature difference.

 

 

 

Difference ¡

A PCB or sensor failure is possible.

 

 

 

No difference ¡ PCB and sensor are normal.

 

 

 

Step 2: If an abnormality was found at Step 1, connect the problem compressor

 

 

 

 

 

 

sensor to the other compressor connector on the PCB, or to the PCB

 

 

 

connector of a device where the F04 alarm has not occurred. Measure the

 

 

 

temperature at the same point (a location where temperature fluctuations are

 

 

 

small), and check whether there is a temperature difference.

 

 

 

Difference ¡

Sensor failure.

 

 

 

No difference ¡ PCB failure.

 

 

 

It is convenient at this time to have a discharge temperature sensor on hand.

 

 

 

(2) Crossed wiring or installation error

 

 

 

Trouble: Although the other compressor is operating and this compressor is stopped, the

 

 

 

discharge temperature of the other compressor does not increase and the discharge

 

 

 

temperature of this compressor rises.

 

 

 

* The discharge temperature remains high immediately after the compressor stops. Wait

 

 

 

for some time after the compressor stops and observe.

 

 

 

Check: Check for crossed wiring and installation errors.

 

 

 

 

Continued

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Sanyo CHDXR09663, CHDXR07263, CHDX09663, CHDX07263 service manual F04, F05 Alarm Alarm code