Carrier DHMVHA Service Manual page 22

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DIAGNOSIS AND SOLUTION (CONT.)
Open Circuit or Short Circuit of Temperature Sensor (EC52/53/54/56/EH60/61)
Error Code
Malfunction decision conditions
Supposed causes
Troubleshooting
Check the connection
between the temperature
sensor and PCB.
Measure the sensor's
resistance value.
Replace the indoor or outdoor
main PCB.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
EC52/53/54/56/EH60/61
If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays the failure.
Wiring mistake
Sensor faulty
PCB faulty
Yes
Yes
Fig. 22 —Check the connection
No
Correct the connection.
No
Replace the sensor.
22