Carrier 38MGR Series Service Manual page 42

DIAGNOSIS AND SOLUTION (CONT)
Fig. 49 —Test the voltage
Fig. 48 — Test the voltage
Remark:
Use a multimeter to test the DC voltage between black pin and
white pin of signal wire The normal value should be around 5V.
Use a multimeter to test the DC voltage between black pin and red
pin of signal wire. The normal value should be around 12V.
Fig. 50 — Test the voltage
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Specifications subject to change without notice. 38MGR-04SM