High Pressure Abnormality (Detected By The High Pressure Switch) - Daikin RZQG71~140L7V1B Service Manual

ESIE12-06
4.13 High Pressure Abnormality (Detected by the High
Pressure Switch)
4.13.1 RZQG71, 100
E3
Remote
Controller
Display
Applicable
RZQG71, 100
Models
Method of Error [In cooling]
Detection  The error is detected by the outdoor unit intermediate heat exchanger thermistor (R5T).
[In heating]
 The error is detected by the indoor unit intermediate heat exchanger thermistor (R3T).
Error Decision [In cooling]
Conditions  When the outdoor unit intermediate thermistor (R5T) detects the pressure shown below.
[In heating]
 When the indoor unit intermediate thermistor (R3T) detects the pressure shown below.
Supposed  Dirt and blockage of the outdoor unit heat exchanger
Causes  Defective outdoor unit fan motor
 Defective indoor unit fan motor
 Defective electronic expansion valve
 Overcharge of refrigerant
 Defective indoor unit PCB
 Defective outdoor inverter unit PCB
Troubleshooting
Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
[In cooling]
Are the
characteristics of the
outdoor unit intermediate
thermistor normal?
YES
The
outdoor unit heat
exchanger is clogged or
blocked.
NO
The
outdoor unit fan is
rotating during operation.
YES
A
Service Diagnosis
3.92 MPa or more continuously for one minute
(Reference: equivalent saturation temperature 62°C)
3.92 MPa or more continuously for one minute
(Reference: equivalent saturation temperature 62°C)
NO
YES
NO
Troubleshooting by Remote Controller
Replace the outdoor unit
intermediate heat exchanger
thermistor.
Clean or remove the clocking
item.
Remove the foreign matter.
Replace the fan motor.
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