# 21 · Carrier · 58MVP — Residential gas furnace fault code lookup by brand

For 21 · Carrier · 58MVP, brand is Carrier; model / control board is 58MVP; fault code is 21; fault name is INVALID MODEL SELECTION, verified against its source on 2026-08-28.

- **Brand:** Carrier
- **Model / control board:** 58MVP
- **Fault code:** 21 _(verified: appears in the quote below)_
- **Fault name:** INVALID MODEL SELECTION _(verified: appears in the quote below)_

## What the source says

> Fault Code 21 INVALID MODEL SELECTION

## Source

- http://www.graycoolingman.com/uploads/1/0/6/6/10667336/carrier_variable-speed_2-stage_troubleshooting.pdf

Last verified: 2026-08-28. Review by: 2028-08-27.
Part of [Residential gas furnace fault code lookup by brand](https://referencesource.org/residential-furnace-fault-codes-by-brand/).