H4 Low Pressure Sensor System Abnormality - Daikin R71FUV1 Service Manual

Troubleshooting by Remote Controller
H4
3.43
System Abnormality
Remote Controller Display
H4
Applicable Models
RZQ-H
Method of Error Detection
Check the continuity of low pressure sensor
Low pressure sensor is not operated when the low
pressure is dropped under specific pressure
(0.12MPa).
Error Decision Conditions
When there is no continuity in the low pressure sensor
during compressor start operating.
Low pressure sensor is not operated when the low
pressure is dropped under specific pressure (0.12MPa)
during compressor operating.
Supposed Causes
Defective low pressure sensor
Disconnection in low pressure switch harness
Defective connection of low pressure sensor
connector
Defective outdoor unit PCB
Refrigerant shortage
Stop valve is not opened
Defective electronic expansion valve
Clogged check valve
Low Pressure Sensor
Si20-701_B
231