Daikin RZQ100B8V3B Service Manual page 222

Error Codes: Outdoor Units
3.11 Abnormal Low Pressure Switch (H4)
1
Applicable model
Remote Controller
Display
Method of
Malfunction
Detection
3 3
Malfunction
Decision
Conditions
4 Supposed Causes
5
3–74
RZQ100~140
H4
Check the continuity of LPS
LPS is not operated when the low pressure is dropped under specific pressure (0.12MPa).
When there is no continuity in the LPS during compressor start operating.
LPS is not operated when the low pressure is dropped under specific pressure (0.12MPa) during
compressor operating.
Faulty LPS
Disconnection in LPS harness
Faulty connection of LPS connector
Defect of outdoor unit PC board
Refrigerant shortage
Stop valve is not opened
Defective expansion valve
Clogged check valve
ESIE05-03
Part 3 – Troubleshooting