Carrier 58MVP Troubleshooting Manual page 37

Variable-speed 2-stage electronic condensing furnace

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STEP

Check RPM feedback line. To do this, connect a DC voltmeter across terminals

PL3-2 ORANGE (+) and PL3-3 VIOLET (-). Repeat COMPONENT TEST by

turning setup switch SW-6 OFF and then back ON. Does voltage across OR-

48.

ANGE and VIOLET wires change between states as shown below?

• State 1—OFF (12.0 — 12.5 vdc)

• State 2—LOW (10.7 — 11.7 vdc)

• State 3—HIGH (9.7 — 10.7 vdc)

Connect a DC voltmeter across ORANGE (+) and VIOLET (-) wires at connec-

tor PL13. Repeat COMPONENT TEST by turning setup switch SW-6 OFF and

then back ON. Does voltage across ORANGE and VIOLET wires change be-

49.

tween states as shown below?

• State 1—OFF (12.0 — 12.5 vdc)

• State 2—LOW (10.7 — 11.7 vdc)

• State 3—HIGH (9.7 — 10.7 vdc)

You have an open wire or bad terminal on either the ORANGE or VIOLET wire

50.

between connectors PL13 and PL3. Repair it or replace blower harness(es).

YES

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