Cj-02" - User Interface Room Temperature Error; C0" - Flow Sensor Error; C4" - Refrigerant Liquid Thermistor R3T (A1P) Abnormality; Ec" - Domestic Hot Water Temperature Error - Daikin EGSQH10S18AA9W Service Manual

ESIE13-03 | Part 2. Troubleshooting
2.5. "CJ-02" – User interface room temperature error
Trigger
Room temperature thermistor of user
interface detects an abnormal value (open
or short circuit).
Possible cause
Faulty room thermistor of user interface.
2.6. "C0" – Flow sensor error
Trigger
Flow sensor still detects a water flow after
45 seconds when pump has stopped.
Possible cause
Water flow caused by external pump.
Faulty flow sensor / hydro PCB A1P.
2.7. "C4" – Refrigerant liquid thermistor R3T (A1P) abnormality
Trigger
Thermistor detects an abnormal value
(open or short circuit).
Possible cause
Faulty refrigerant liquid thermistor R3T
(A1P) / hydro PCB A1P.
2.8. "EC" – Domestic hot water temperature error
Trigger
R5T (A1P) (water tank thermistor) detects
temperature above 89°C.
Possible cause
Increased water temp by external heat
source.
Faulty water tank thermistor R5T / hydro
PCB A1P.
Page 22
Ground source heat pump
Effect
Unit will keep operating.
Check
Check room thermistor read out value via
the user interface and compare with
actual room temperature.
Effect
Unit will stop operating.
Check
Check if another (external) pump is
installed on the same water circuit.
Check flow sensor (see page
Effect
Unit will stop operating.
Check
Check thermistor R3T (see page
Effect
Unit will continue operating.
Check
Check if another heat source is installed
on the same water circuit.
Check thermistor R5T (see page
2. Error code based troubleshooting
Reset
Auto-reset.
Corrective action
Replace user interface or replace hydro
PCB A1P (see
Reset
Via user interface.
Corrective action
Correct hydraulic field circuit. Refer to the
Installer Reference Guide.
77). Replace flow sensor (see
replace hydro PCB A1P (see
If flow sensor failed due to contamination,
check for source of contamination and
consider to install an additional water fil-
ter.
Reset
Auto-reset when problem is solved.
Corrective action
58). Replace thermistor R3T (see
hydro PCB (see
Reset
Auto-reset when trouble is solved.
Corrective action
Correct hydraulic field circuit. Refer to the
Installer Reference Guide.
58). Replace thermistor R5T (see
hydro PCB A1P (see
page 93).
page 104) or
page 93).
page 143) or
page 93).
page 143) or
page 93).
13/05/15 | Version 2.0