Daikin Sky Air R-407C - Malfunctioning Outdoor Thermistor System (H9)

Error Codes: Outdoor Units ESIE02–01
3–48 Part 3 – Troubleshooting
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3.8 Malfunctioning Outdoor Thermistor System (H9)
Error code H9
LED indications The table below shows the LED indications.
Error generation The error is generated when the thermistor resistance is out of its range (60Ω to 600kΩ).
Causes The possible causes are:
■ Malfunctioning outdoor thermistor
■ Malfunctioning outdoor thermistor connector connection
■ Malfunctioning outdoor unit PCB.
Troubleshooting To troubleshoot, proceed as follows:
Operation HAP (green) H1P (red) H2P (red)
Normal 688
Malfunction 677
Is
it connected
properly?
Correct the
connection.
Check the thermistor resistance.
Refer to: checking the
thermistor resistance.
Is it normal?
Replace the
termistor.
Replace the
outdoor unit PCB
No
Yes
No
Yes
Check the unit
type.
Check the connector
connection of the outdoor
temperature sensor (R1T) on
X4A on the outdoor unit PCB.