FieldBench
ICP codes

ICP

Not econ

Protect

Not economizing when it should

OA is in the free-cooling window and the damper stayed shut. Title 24 FDD class.

Walk Not econ in Diagnose

Sign in for the next measurement

First check

1 Damper position vs command

On ICP PGC look at the economizer before the compressor. Commanded open? Blade actually open? Linkage off the shaft is a rooftop weekly. Confirm OA really is below the high-limit / enthalpy changeover on THIS module (not a 55 °F guess).

Expect: Blade matches the module command. Stuck open = overventilation. Stuck closed = no free cooling.

The rest of the walkthrough is Diagnose.

On the plates

  • Confirm OA really is below the high-limit / enthalpy changeover on THIS module (not a 55 °F guess).
  • Y1 present? Some modules will not economize without a cool call.
  • Min-position only, jammed blades, or a MAT low-limit holding the damper closed.
  • Mechanical cool running in 50 °F OA is this fault until the damper moves.

Plates that use Not econ

Same number, other makers

Not econ on ICP is not the same code on these plates.