Bryant 619R C Series Service Manual page 22

Open circuit or short circuit of temperature sensor diagnosis and solution
(E4/E5/F1/F2/F3)
Error Code
Malfunction decision conditions
Supposed causes
E4/E5/F1/F2/F3
If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays the
failure.
S
Wiring mistake
S
Sensor faulty
Fig. 28 – Troubleshooting
Fig. 29 – Temperature sensor diagnosis
22
Replace the sensor