FieldBench
ICP codes

ICP

Enable

Protect

VFD enable missing

Drive has line voltage but will not run — the unit board never enabled it.

Walk Enable in Diagnose

Sign in for the next measurement

First check

1 Read the drive before you cycle power

On ICP PGC photograph the VFD keypad or the unit-board fan alarm (OC, LU, OU, GF, OH, limp). Power-cycle wipes what you needed. 24 VAC (or the digital enable this drive uses) at the enable terminals while G / occupied / heat / cool is on.

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

  • 24 VAC (or the digital enable this drive uses) at the enable terminals while G / occupied / heat / cool is on.
  • 0 V enable with a live G = unit board output or a smoke/firestat shutdown still open.
  • Some EcoBlue / Reliatel cabinets enable on a board relay, not on G from the stat.

Plates that use Enable

Same number, other makers

Enable on ICP is not the same code on these plates.