Carrier 40MAHB Series Service Manual page 23

40MAHB: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
Indoor Temperature Sensor Is an Open Circuit or a Short Circuit (T1, T2) (EH60)
Description: If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays the failure code.
Recommended parts to repair:
• Connection wires
• Sensors
• Indoor main PCB
Troubleshooting
NOTE: Figure 21 and the value shown within are for reference only.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Check the connection between
the temperature sensor and PCB.
Is it properly wired?
YES
Measure the resistance value
of the sensor.
Is it within
acceptable parameters?
YES
Replace the indoor main PCB.
Fig. 21 —Test
NO Ensure proper connections.
NO Replace the sensor.
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