Keep the furnace off. Do not reset a rollout switch. If you smell gas or a carbon-monoxide alarm sounds, leave the building and contact emergency services or the gas utility.
What does Daikin code 6 Flash mean?
Daikin furnace code 6 Flash means the flame-rollout switch or its fuse opened on the supported control family. Confirm the model number and diagnostic chart inside the furnace door before replacing parts.
What causes Daikin code 6 Flash?
- A blocked flue or combustion-air path
- A burner or gas-pressure problem
- A damaged or restricted heat exchanger
Can I troubleshoot Daikin code 6 Flash?
Keep the furnace off. Do not reset a rollout switch. If you smell gas or a carbon-monoxide alarm sounds, leave the building and contact emergency services or the gas utility.
How much does Daikin code 6 Flash cost to fix?
A heat exchanger replacement typically costs between $500 and $3,500 nationally.
When should I call a technician?
Leave the furnace off and call a licensed technician for a combustion-safety inspection.
Sources and model scope
Fault codes vary by model and control board. Confirm the diagnostic chart inside your furnace panel or the official manual before acting.
Scope used here: DM80HS-style integrated controls using the documented 1–8 flash chart.
- Daikin Comfort Technologies: DM80HS Single-Stage Multi-Speed Gas Furnace — Product Specifications
SS-DM80HS · The 1–8 flash integrated-control family documented for DM80HS-series furnaces; sister-brand models must use the same control chart.
Compiled by Warmlo Editorial · Reviewed August 2026
This is general information, not professional advice. Gas, electrical, and combustion repairs can be dangerous — when in doubt, call a licensed technician.