FieldBench
Carrier codes

Carrier

MISMATCH

Protect

Equipment ID / size mismatch

Wall-control setup indoor/outdoor size does not match the device on the bus. A setup, not a pressure switch.

Walk MISMATCH in Diagnose

Sign in for the next measurement

First check

1 Damper position vs command

On Carrier 59MN7 look at the economizer before the compressor. Commanded open? Blade actually open? Linkage off the shaft is a rooftop weekly. Indoor size in Infinity setup vs the 59MN7 plate.

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

The rest of the walkthrough is Diagnose.

On the plates

  • Indoor size in Infinity setup vs the 59MN7 plate.
  • Outdoor model vs a Greenspeed pair.
  • Do not chase 32 — this modulator has no low-fire switch.

Plates that use MISMATCH