Carrier 40MB C Series Service Manual page 22

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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.

Wiring mistake

Sensor faulty

Fig. 28 – Troubleshooting

Fig. 29 – Temperature sensor diagnosis

Replace the sensor

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