FieldBench
Carrier codes

Carrier

0-10V

Protect

VFD speed reference

Drive is enabled but stays at min Hz or 0 because analog / serial speed is missing.

Walk 0-10V in Diagnose

3 plates — walk the one on the cabinet

First check

1 Read the drive before you cycle power

On Carrier 48FC photograph the VFD keypad or the unit-board fan alarm (OC, LU, OU, GF, OH, limp). Power-cycle wipes what you needed. 0–10 VDC at the speed-reference pair under a high-fan call. Typical occupied cool is not 10 V — check the unit-board fan table.

Expect: Live drive code written down. Line voltage at L1/L2/L3 of the drive.

The rest of the walkthrough is Diagnose.

On the plates

  • 0–10 VDC at the speed-reference pair under a high-fan call. Typical occupied cool is not 10 V — check the unit-board fan table.
  • 0 V with enable = broken analog wire, board analog dead, or the drive is set for a different reference (serial vs 0–10).
  • 10 V at all times = board commanding 100%. High static / oC will follow.

Plates that use 0-10V

Same number, other makers

0-10V on Carrier is not the same code on these plates.