Mitsubishi Heavy Industries FDCH1010CKXE6G, Technical Manual

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 48 

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'09•KX-T-139

Error display on 7-segment indicator after ending the check operation

Code indicato

Data indicator

Display contents

Check following points

CHL

CHU

CHJ

CHE

CHE

Operation valve is closed. 

(Refrigerant circuit is shut off 

partially.)

・

Isn’t the operation valve of outdoor unit left open?

・

Is the low pressure sensor normal? (Detected pressure can be seen on 

the 7-segment indicator.)

・

Is the connector of indoor unit expansion valve coil connected?

・

Isn’t the indoor unit expansion valve coil disconnected from the 

expansion valve body?

・

Is the indoor unit heat exchanger sensor normal? (Check if the sensor is 

disconnected.)

Mismatch between 

refrigerant pipes and signal 

cables. Refrigerant is not 

circulated to the indoor unit of 

which No. is displayed.

・

 Are the refrigerant pipes and signal cables connected properly between 

the indoor and outdoor units?

・

 Is the connector of indoor unit expansion valve coil connected?

・

 Isn’t the indoor unit expansion valve coil disconnected from the 

expansion valve body?

・

 Is the indoor unit heat exchanger sensor normal? (Check if the sensor is 

disconnected.)

Expansion valve on the indoor 

unit of which No. is displayed 

is not operating properly.

・

 Is the connector of indoor unit expansion valve coil connected?

・

 Isn’t the indoor unit expansion valve coil disconnected from the 

expansion valve body?

・

 Is the indoor unit heat exchanger sensor normal? (Check if the sensor is 

disconnected.)

Abnormal ending of check 

operation.

・

 Isn’t any error displayed (E??) on the indoor unit or outdoor unit?

・

 Are signal cables connected without play?

・

 Hasn’t the SW setting been changed during the check operation?

Abnormal ending of check 

operation. Indoor unit of which 

No. is displayed is abnormal.

・

 Isn’t any error displayed (E??) on the indoor unit or outdoor unit?

・

 Are signal cables connected without play?

・

Is the power supply to the indoor unit turned on?

※

 When any error is detected, errors other than those listed above may be displayed. In such occasion, refer to page 56.

Abnormal indoor unit No.

Abnormal indoor unit No.

Abnormal indoor unit No.

Display on 7-segent indicator during check operation

(a) Starting the check operation

・

Confirm that all of the following switches are turned OFF: SW3-2 (Auto backup operation), SW3-6 (Pipe wash mode), SW3-7 (Forced cooling/heating mode), 
SW5-1 (Test run), SW5-2 (Test run cooling setting), SW5-3 (Pump-down operation) and SW5-6, -7, -8 (Capacity measurement mode). (In case of combination, on 
both main and slave units)

・

At the next, turn the SW3-5 (Check operation) OFF 

¡

ON (only on master unit in case of combination) so that the check operation will start.

・

 It takes 15 – 30 minutes normally (max. 80 min) from the start to the end of check operation.

(b) End the check operation and the result display

・

When the check operation is over, the system stops automatically. The 7-segment indicator shows the result (only on master unit in case of combination).

<Normal ending>

・

7-segment indicator shows “CHO End”.

・

Return the SW3-5 to OFF. The 7-segment indicator returns to normal display.

・

Return SW3-7 (Forced cooling/heating mode) to ON.

<Abnormal ending>

・

7-segment indicator shows an error alarm.

・

Referring to the section [Inspect here], repair the faulty section and return the SW3-5 to OFF. 

・

At the next, repeat the check operation from the Step (2) above.

(2) Method of check operation

Code indicato

Data indicator

Display contents

Max. remaining time

Max. remaining time

H1

H2

HO

CHO

End

Check operation preparation on. Indicates max. remaining time (min).

(In case of combination, indicated on master unit only.)

Check operation on. Indicates max. remaining time (min).

(In case of combination, indicated on master unit only.)

Check operation on. (Including preparation operation on).

(Indicated only on slave unit of combination.)

Normal ending of check operation.

(In case of combination, indicated on master unit only.)