York YHKE09XEEAMH-RX Service Manual page 42

9.2.5 Open circuit or short circuit of temperature sensor diagnosis and solution(E5)
Error Code
Malfunction decision
conditions
Supposed causes
Trouble shooting:
Check the connections
between temperature
sensor and main PCB.
Are the connections
good?
Yes
Check the resistance value
of the sensor, is it normal?
No
Replace the sensor
E4/E5/F1/F2/F3
If the sampling voltage is lower than 0.06V or higher than 4.94V,
the LED will display the failure.
Wiring mistake
●
Sensor faulty
●
No Correct the connections.
Yes
Replace indoor or
outdoor main PCB.
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