Bryant 619AHB Series Service Manual page 23

SG-619AHB-01: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
Open circuit or short circuit of temperature sensor diagnosis and solution (E4/E5/F1/F2/F3)
Malfunction Decision Conditions
If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays the failure.
Possible Causes:
• Wiring mistake
• Sensor faulty
• PCB faulty
Troubleshooting
Check the connection
between the temperature Correct the connection.
sensor and PCB.
Measure the resistance
Replace the sensor.
value of the sensor.
Replace the indoor or outdoor
main PCB.
Fig. 26 — Check the connection
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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