Mitsubishi Heavy Industries KX6 series Service Manual Download

Page: 207 / 216

205

'10 • KX-SM-148

(5) Measures to be taken after check operation

When any display other than “CHO-End” is displayed after completing the judgment of check operation, the meanings of each display
are shown as follows.
After checking the contents of inspection and repairing nonconforming items, perform check operation again.

Code

display

Data

display

Meaning of display

Contents of Inspection

CHL

---

Refrigerant circuit is choked at certain
place.

Operation valve on outdoor unit may be left closed.
Low pressure sensor may be anomalous.
Check the detected pressure displayed on 7-segment and compare it with the
value measured with gauge manifold.
Refrigerant piping or signal wiring may not be connected properly. *1 (See page
207.) Check with Mente PC, etc.
Indoor heat exchanger temperature thermistor may be anomalous or disconnected.
*2 (See page 207.)
Refrigerant may not be charged correctly.
Indoor unit expansion valve may not be operating properly.
Connector of indoor unit expansion valve coil may not be connected. *3 (See page
207.)
Indoor unit expansion valve coil may be disconnected from main body of expansion
valve. *4 (See page 207.)
Outdoor unit PCB may be defective.

CHU

Anomalous
indoor unit
No.

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

Refrigerant piping or signal cables may not be connected properly between indoor
and outdoor units. *1 (See page 207.) Check with Mente PC, etc.
Indoor heat exchanger temperature thermistor may be anomalous or disconnected.
*2 (See page 207.)
Operation valve on outdoor unit may be left closed.
Check it especially when many indoor units No. are displayed in data display column of CHU.
it may be displayed by influence of liquid flooding due to the trouble on any other
indoor unit. If CHJ is displayed at the same time, check preferentially the indoor
unit displaying CHJ and after repairing, perform check operation again.
Refrigerant may not be charged correctly.
Indoor unit expansion valve may not be operating properly.
Connector of indoor unit expansion valve coil may not be connected. *3 (See page
207.)
Indoor unit expansion valve coil may be disconnected from main body of expansion
valve. *4 (See page 207.)

CHJ

Anomalous
indoor unit

No.

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

Indoor heat exchanger temperature thermistor may be anomalous or disconnected.
*2 (See page 207.)
it may be displayed by influence of liquid flooding due to the trouble on any other
indoor unit.
Contamination may be trapped in expansion valve due to installation or transitional cause.
Indoor unit expansion valve may not be operating properly.
Connector of indoor unit expansion valve coil may not be connected. *3 (See page
207.)
Indoor unit expansion valve coil may be disconnected from main body of expansion
valve. *4 (See page 207.)
Refrigerant may not be charged correctly.

CH1

---

Indoor heat exchanger temperature
anomaly.

Indoor heat exchanger temperature thermistor may be anomalous or disconnected.
*2 (See page 207.)

CH3

---

Unable to do indoor EEV trouble check. Unable to do indoor EEV trouble check because of unstable operation.