FieldBench
York codes

York

Rapid red

Lockout

Twinning / 24V phasing

TWIN circuit or 24 V phasing.

Walk Rapid red in Diagnose

5 plates — walk the one on the cabinet

First check

1 Is this cabinet actually twinned?

On a standalone York TM8T, nothing belongs on the TWIN terminal. A leftover jumper throws this. TWIN terminal empty on a standalone.

Expect: TWIN empty on a single cabinet.

The rest of the walkthrough is Diagnose.

On the plates

  • Standalone TM9V: nothing belongs on the TWIN terminal.
  • Twinned pair must be the same JCI family / same IFC revision. Check 24 V phasing per the twinning kit.
  • This is a flicker, not a counted code.
  • Nothing on TWIN unless the job is actually twinned.
  • TWIN terminal empty on a standalone.

Plates that use Rapid red