Bryant 538PAQ012RBMA Service Manual page 35

DIAGNOSIS AND SOLUTION (CONT)
Open circuit or short circuit of temperature sensor diagnosis and solution (E4/E5/F1/F2/F3)
Error Code
Malfunction decision conditions
Supposed causes
Troubleshooting
Check the connection
between the temperature
Measure the resistance
value of the sensor
Replace indoor or outdoor
E4/E5/F1/F2/F3
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
sensor and PCB.
Yes
Yes
main PCB
Fig. 33 – Check the connection
No
Correct the connection
No
Replace the sensor
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