Mitsubishi Heavy Industries KX6 series Service Manual Download

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206

'10 • KX-SM-148

Code

display

Data

display

Meaning of display

Contents of Inspection

CHH

---

It may be liquid flooding.

Refrigerant piping or signal cables may not be connected properly between indoor
and outdoor units. *1 (See next page.)
Power switch may be turned off on some indoor units.
Check if power is supplied to all indoor units.
Indoor unit expansion valve may not be operating properly.
Connector of indoor unit expansion valve coil may not be connected. *3 (See next
page)
Indoor unit expansion valve coil may be disconnected from main body of expansion
valve. *4 (See next page.)
If no indoor unit indicates CHJ, check also indoor units which are not showing CHJ.
Refrigerant may not be charged correctly.

CHE

---

Anomalous stop of check operation.

Some error may happen on indoor or outdoor units.
Check if any error code “E??” is displayed on indoor or outdoor units.
There may be anomalous on signal wire connection.
Check if signal wire is connected firmly.
SW setting on outdoor PCB might have been changed.
Check if any SW setting has been changed during check operation.

CHE

Anomalous
indoor unit
No.

Anomalous stop of check operation.

Indoor unit indicated its No. has
anomaly.

Some error may happen on indoor or outdoor units.
Check if any error code “E??” is displayed on indoor or outdoor units.
There may be anomalous on signal wire connection.
Check if signal wire is connected firmly.
Power switch may be turned off on some indoor units.
Check if power is supplied to indoor units.

High pressure anomaly.

Refrigerant circuit may be choked at a certain place. Refer to the technical manual
or the above.

Current cut.

Refrigerant circuit may be choked at a certain place. Refer to the technical manual
or the above.
It might have been started operation while bottom of compressor was still cold.
Perform check operation again after the bottom of compressor has been enough
warm.

Low pressure anomaly.

Refrigerant circuit may be choked at a certain place. Refer to the technical manual
or the above.

36-3

Liquid flooding anomaly.

It may be in the same condition as “CHH---”. Refer to the technical manual or the
above.

Note (1) When an error code (E??) is displayed, press SW9 to display all indicalions other than the error code in series.

Press SW9 again to return to error display.

(2) When check operation has been suspended, the followings listed in below table are displayed depending on judgment at

the time of stoppage.

Code display

Data display

Contents of display

---

Refrigerant circuit is choked at a certain place.

LPL

Refrigerant circuit is choked at a certain place. (In combination use)

Anomalous indoor unit No. Refrigerant is not circulated in the indoor unit of indicated No.

Anomalous indoor unit No. Expansion valve does not operate on the indoor unit of indicated No.

Anomalous indoor unit No. Refrigerant is not circulated in the indoor unit of indicated No.

Anomalous indoor unit No. Refrigerant was not circulated in the indoor unit of indicated No. just after starting but it

has been confirmed that it is now circulated.

(3) If refrigerant circuit is choked at a certain place, it may be stopped with error code E40 (High pressure anomaly), E42

(Current cut) or E49 (Low pressure anomaly).

(4) When it has stopped with error code E36-3 (Liquid flooding anomaly), it may be in the same condition as “CHH---”.
(5) When it has stopped with error code E42 (Current cut), it might have been started operation while bottom of compressor

was still cold. Perform check operation again after the bottom of compressor has been enough warm.