64" - Air Return Thermistor Faulty; 65" - Air Intake Thermistor Faulty - Daikin Modular L Smart Service Manual

ESIE19-06 | Part 2. Troubleshooting
2.2.1.3. "64" – Air return thermistor faulty
Trigger
Air return sensor abnormal signal.
Possible cause
HRV unit - Electrical components
Faulty air return sensor.
Faulty main PCB.
External factor (e.g. electrical noise) (error
disappears after power reset, but returns
after a while).
2.2.1.4. "65" – Air intake thermistor faulty
Trigger
Air intake sensor abnormal signal.
Possible cause
HRV unit - Electrical components
Faulty air intake sensor.
Faulty main PCB.
External factor (e.g. electrical noise) (error
disappears after power reset, but returns
after a while).
Page 24
Modular L Smart
Effect
Unit will not stop operating.
Control will use default value for air return
sensor.
Check
Read actual air return sensor by user
interface.
Erase the error record from the remote
controller.
Check HAP on main PCB is blinking.
Check connector air intake sensor cor-
rectly mounted.
Check for source which could cause elec-
trical interference.
Effect
Unit will not stop operating.
Control will use default value for air intake
sensor.
Check
Read actual air intake sensor by user
interface.
Erase the error record from the remote
controller.
Check HAP on main PCB is blinking.
Check connector air intake sensor cor-
rectly mounted.
Check for source which could cause elec-
trical interference.
2.2. Error based troubleshooting
Reset
Automatic reset.
To remove warning from main history,
push the ON/OFF button on the remote
controller for 5 seconds in the check
mode.
Corrective action
Replace the air return sensor.
Replace main PCB.
Reconnect plug of air return sensor.
Avoid electrical interference.
Reset
Automatic reset.
To remove warning from main history,
push the ON/OFF button on the remote
controller for 5 seconds in the check
mode.
Corrective action
Replace the air intake sensor.
Replace main PCB.
Reconnect plug of air intake sensor.
Avoid electrical interference.
21/01/20 | Version 1.1