FieldBench
Carrier codes

Carrier

OA ERR

Protect

OA SENS ERR (JADE LCD example)

JADE LCD: OA / SENS ERR (or OA SYLK ERR). Outside-air thermistor failed or lost SYLK. Board thinks the roof is 20 °F or 120 °F.

Walk OA ERR in Diagnose

3 plates — walk the one on the cabinet

First check

1 Which sensor is this code?

On Carrier 48FC OA ERR is a specific thermistor — indoor return/pipe, outdoor coil, discharge, or ambient. Unplug that sensor and ohm it vs the OEM temperature/resistance chart. Probe OA at the hood vs the module. Several degrees off is a sensor, not a damper.

Expect: Ohms move with temperature. Not open, not shorted.

The rest of the walkthrough is Diagnose.

On the plates

  • Probe OA at the hood vs the module. Several degrees off is a sensor, not a damper.
  • Ohm / SYLK the OA sensor. Cut 2-wire in the hood is weekly.
  • Sun-soaked hood vs a shaded probe — measure the air the sensor sees.

Plates that use OA ERR

Same number, other makers

OA ERR on Carrier is not the same code on these plates.