Error Codes: Outdoor Units
ESIE13-02
Part 4 – Troubleshooting
106
3
1
4
5
4.3
“E4”
Actuation of Low Pressure Sensor
Remote controller
display
E4
Method of
malfunction
detection
[In cooling]
Detect malfunctions by the pressure sensor (S1NPH).
[In heating]
Detect malfunctions by the heat exchanger distribution pipe thermistor (R4T).
Malfunction
decision conditions
[In cooling]
When the detection pressure is the following value:
0.12 MPa or less continues for 5 minutes
When the saturated pressure equivalent to the detection temperature is the following value:
0.12 MPa or less continues for 5 minutes
Supposed causes
The stop valve remains closed
Faulty pressure sensor and intermittent harness
Faulty outdoor PC board
Abnormal drop of low pressure
(inadequate refrigerant)
(Abnormal refrigerant piping system (liquid pipe system))
(Faulty electronic expansion valve)
