Carrier 24AHA4 - Page 20

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6 --- Indoor room temperature sensor Open or short circuited --- diagnosis and solution (E5)
Error Code E5
Malfunction conditions If the reading voltage is lower than 0.06V or higher than 4.94V, the LED displays the failure.
Possible Causes
• Wiring mistake
• Defective sensor
• Defective PCB
Trouble shooting:
Check the connections
between temperature
sensor and main PCB.
Are the connections
good?
Correct the connections.No
Yes
Yes
Replace indoor or
outdoor main PCB.
Replace the sensor and
check if the problem happen
again?
Check the resistance value
of the sensor. Is it normal?
No
A14485