H9" - Outdoor Air Thermistor (R1T) Abnormality; J1" - High Pressure Sensor Abnormality; J3" - Discharge Thermistor Abnormality; J5" - Suction Thermistor (R3T) Abnormality - Daikin EGSQH10S18AA9W Service Manual

ESIE13-03 | Part 2. Troubleshooting
2.19. "H9" – Outdoor air thermistor (R1T) abnormality
Trigger
Thermistor detects an abnormal value
(open or short circuit).
Possible cause
Faulty outdoor air thermistor R1T / refrig-
erant/brine PCB A9P.
2.20. "J1" – High pressure sensor abnormality
Trigger
High pressure sensor detects an abnor-
mal value for 3 minutes (> 4,5 MPa or <
-0,05 MPa).
Possible cause
Faulty high pressure sensor / refriger-
ant/brine PCB A9P.
2.21. "J3" – Discharge thermistor abnormality
Trigger
Discharge thermistor detects an abnormal
value (open or short circuit).
Possible cause
Faulty discharge thermistor (R2T) / refrig-
erant/brine PCB A9P.
2.22. "J5" – Suction thermistor (R3T) abnormality
Trigger
Suction thermistor detects an abnormal
value (open or short circuit).
Possible cause
Faulty suction thermistor (R3T) / refriger-
ant/brine PCB A9P.
13/05/15 | Version 2.0
Ground source heat pump
Effect
Unit stops operating.
Check
Check thermistor R1T (see page
(Remark: also check the LC filter connec-
tion between the X5M terminal and the
PCB A9P.)
Effect
Unit stops operating.
Check
Check high pressure sensor (see
page 70).
Effect
Unit stops operating.
Check
Check thermistor R2T (see page
Effect
Unit stops operating.
Check
Check thermistor R3T (see page
2. Error code based troubleshooting
Reset
Auto-reset when problem is solved.
Corrective action
58). Replace thermistor R1T (see
PCB A9P (see page
Reset
Auto-reset.
Corrective action
Replace the high pressure sensor (see
page 140) or PCB A9P (see
Reset
Auto-reset when problem is solved.
Corrective action
58). Replace thermistor R2T (see
PCB A9P (see page
Reset
Auto-reset when problem is solved.
Corrective action
58). Replace thermistor R3T (see
PCB A9P (see page
page 143) or
96).
page 96).
page 143) or
96).
page 143) or
96).
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