Refrigerant Shortage (Alert) - Daikin SkyAir GQI-Eco Series Service Manual

Troubleshooting by Remote Controller

4.29 Refrigerant Shortage (Alert)

U0
Remote
Controller
Display
Applicable RZQG
Models
Method of Error Refrigerant shortage is detected according to the electronic expansion valve opening degree
and measured temperatures and pressures.
Detection
Error Decision (In cooling operation)
Conditions 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.
∗
Supposed
Causes
Troubleshooting
Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Is the refrigerant
amount appropriate?
YES
Note:
∗
Refrigerant shortage alarm is indicated but operation continues.
CHECK 10 Refer to P.175.
148
Even if error occurs, operation will continue.
Stop valve is not opened
Insufficient refrigerant amount
Clogged refrigerant piping system
NO
SiBE281013
Collect refrigerant. After vacuum
drying is complete, charge an
appropriate amount of
refrigerant.
CHECK 10
Check the refrigerant piping
system for clogging.
Service Diagnosis