Goodman Furnace Code 6
Safety faultShown as: 6 flashes, then a pause, repeating
Open rollout limit (or blown control board fuse). A manual-reset rollout switch on the burner assembly tripped because flame rolled out of the heat exchanger instead of being drawn in.
Manual wording: “Open Rollout Temperature Limit Switch”
Documented for: Goodman GMS8, GMH8, GDS8, GDH8, GHS8, GME8, GMES80, GCES80, GMSS92, GMSS96, GCSS96 (single red diagnostic LED)
Likely causes, most common first
- Flame rollout
- Misaligned burners
- Blocked flue and/or air inlet pipe
- Failed induced draft blower
- Short in 24 volt AC control circuits or safety circuits
- Faulty rollout limit
- Blown integrated control module fuse
What you can safely check yourself
- Turn the furnace off at its power switch and leave it off
- If you smell gas, leave the house and call the gas utility from outside
When to call a technician
Flame rollout means combustion gases are coming out of the burner box. This is a technician-only repair (rollout limits are manual reset for exactly that reason) and often points at a blocked flue or a cracked heat exchanger. Never reset a rollout switch yourself.
A Goodman furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Sources
- Installation Instructions for *M(H,S)8 / *D(H,S)8 / *HS8 / GME8 Gas Furnace (Category I) - IO-359J (Daikin Comfort Technologies (Goodman brand), Goodman GMS8, GMH8, GDS8, GDH8, GHS8, GME8 80% AFUE gas furnaces) · checked 2026-08-25
- Installation Instructions - *MES80 / *CES80 Gas Furnace, Category I - IOG-2021H (Daikin Comfort Technologies (Goodman brand), Goodman GMES80, GCES80 80% AFUE gas furnaces (PCBBF145 control board)) · checked 2026-08-25
- Installation Instructions for *MSS9* & *CSS9* Single-Stage Gas Furnace - IOG-2009Q (Daikin Comfort Technologies (Goodman brand), Goodman GMSS92, GMSS96, GCSS96 single-stage 92/96% AFUE gas furnaces) · checked 2026-08-25