Low Pressure Switch System Abnormality - Daikin RZQG71L9V1 Service Manual

ESIE15-13C

4.21 Low Pressure Switch System Abnormality

H4
Remote
Controller
Display
RZQG71~140
Applicable
Models
Check the continuity of LPS.
Method of Error
Detection
When there is no continuity in the LPS during compressor start operating.
Error Decision
Conditions
 Faulty LPS
Supposed
 Disconnection in LPS harness
Causes
 Faulty connection of LPS connector
 Defect of outdoor unit PC board
 Refrigerant shortage
 Stop valve is not opened
 Defective expansion valve
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Is LPS connector connected
to outdoor PC board?
YES
Turn off the power supply.
After 10 minutes, check the following.
CHECK 7
Is low pressure
abnormally low? (*1)
YES
Is there continuity in control and
protection LPS? (*2)
YES
Note:
*1 Verify why pressure in the unit is abnormally low
*2 LPS resistance (closed contact) should be < 10Ω
Service Diagnosis
NO
NO
NO
Troubleshooting by Remote Controller
Connect correctly.
Correct the refrigerant pipe.
Replace the LPS.
Replace the outdoor control
PC board.
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