# A126_F · Rheem · Communicating Furnace — Residential gas furnace fault code lookup by brand

For A126_F · Rheem · Communicating Furnace, brand is Rheem; model / control board is Communicating Furnace; fault code is A126_F; fault name is Flame not Sensed with Gas Valve On - UL, verified against its source on 2026-08-28.

- **Brand:** Rheem
- **Model / control board:** Communicating Furnace
- **Fault code:** A126_F _(verified: appears in the quote below)_
- **Fault name:** Flame not Sensed with Gas Valve On - UL _(verified: appears in the quote below)_

## What the source says

> A126_F Flame not Sensed with Gas Valve On - UL

## Source

- https://airmanagementsupply.com/documents/rheem-ruud_R802V_UH_installation_instructions.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/).