Troubleshooting by Remote Controller ESIE15-13B
168 Service Diagnosis
4.31 Refrigerant Shortage (Alert)
Remote
Controller
Display
U0
Applicable
Models
RZQG
Method of Error
Detection
Refrigerant shortage is detected according to the electronic expansion valve opening degree
and measured temperatures and pressures.
Error Decision
Conditions
(In cooling operation)
When the electronic expansion valve opens fully and low pressure is below 0.25 MPa
continuously for 30 seconds.
(In heating operation)
When the electronic expansion valve opens fully and the suction superheat is large (more than
20°C) continuously for 60 seconds.
* Even if error occurs, operation will continue.
Supposed
Causes
Stop valve is not opened
Insufficient refrigerant amount
Clogged refrigerant piping system
Troubleshooting
Note:
* Refrigerant shortage alarm is indicated but operation continues.
Refer to P.194.
NO
Collect refrigerant. After vacuum
drying is complete, charge an
appropriate amount of
refrigerant.
YES
Is the refrigerant
amount appropriate?
Check the refrigerant piping
system for clogging.
Caution
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
CHECK 9
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