Malfunctioning Outdoor Thermistor System - Daikin Sky Air R-407C Service Manual

Error Codes: Outdoor Units
3.8 Malfunctioning Outdoor Thermistor System (H9)
1
Error code
LED indications
Error generation
3 3
Causes
4
Troubleshooting
5
3–48
H9
The table below shows the LED indications.
Operation
Normal
Malfunction
The error is generated when the thermistor resistance is out of its range (60Ω to 600kΩ).
The possible causes are:
Malfunctioning outdoor thermistor
Malfunctioning outdoor thermistor connector connection
Malfunctioning outdoor unit PCB.
To troubleshoot, proceed as follows:
connection of the outdoor
temperature sensor (R1T) on
X4A on the outdoor unit PCB.
Check the thermistor resistance.
thermistor resistance .
HAP (green)
6
6
Check the unit
type.
Check the connector
Is
it connected
No
properly?
Yes
Refer to: checking the
Is it normal? No
Yes
Replace the
outdoor unit PCB
H1P (red) H2P (red)
8 8
7 7
Correct the
connection.
Replace the
termistor.
Part 3 – Troubleshooting
ESIE02–01