What does Goodman code 1 Flash mean?
Goodman furnace code 1 Flash means the furnace entered ignition lockout after failing to establish flame on the supported control family. Confirm the model number and diagnostic chart inside the furnace door before replacing parts.
What causes Goodman code 1 Flash?
- No gas reaching the burners
- A failed hot-surface igniter
- A dirty or weak flame sensor
Can I troubleshoot Goodman code 1 Flash?
- Confirm the thermostat is calling for heat and the gas shutoff has not been moved.
- Turn furnace power off for five minutes, restore it once, and note whether the same code returns.
How much does Goodman code 1 Flash cost to fix?
A furnace ignitor replacement typically costs between $150 and $750 nationally.
When should I call a technician?
Call a licensed technician if ignition fails again after one reset or if you smell gas.
Symptoms this code causes
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.