Daikin R71FUV1 Service Manual page 166

Troubleshooting by Remote Controller
Remote Controller Display
E3
Applicable Models
RZQG125, 140L
Method of Error Detection
[In cooling]
Detect the continuity of high pressure switch (S1PH)
with the protection device circuit.
The error is detected by the outdoor unit intermediate
heat exchanger thermistor (R5T).
[In heating]
Detect the continuity of high pressure switch (S1PH)
with the protection device circuit.
The error is detected by the indoor unit intermediate
heat exchanger thermistor (R3T).
Error Decision Conditions
When the high pressure switch is activated (4.0 MPa)
When the outdoor unit intermediate thermistor (R5T)
detects the pressure shown below.
3.92 MPa or more continuously for 1 minute
(Reference: equivalent saturation temperature 62°C)
When the indoor unit intermediate thermistor (R3T)
detects the pressure shown below.
3.92 MPa or more continuously for 1 minute
(Reference: equivalent saturation temperature 62°C)
Supposed Causes
Stop valve is not opened
Harness breaking or poor connector connection of the
high pressure switch
Defective high pressure switch
Indoor unit suction filter is blocked (In heating)
Defective indoor unit fan (In heating)
Outdoor heat exchanger is dirt (In cooling)
Defective outdoor unit fan (In cooling)
Refrigerant overcharge
Defective outdoor unit PCB
Si20-701_B
159