What does Daikin code E1 mean?
Daikin furnace code E1 means the pressure switch was closed when the control expected it to be open on the supported control family. Confirm the model number and diagnostic chart inside the furnace door before replacing parts.
What causes Daikin code E1?
- A pressure switch stuck closed
- A pinched or incorrectly connected pressure hose
- Shorted pressure-switch wiring or a control fault
Can I troubleshoot Daikin code E1?
- Turn furnace power off for five minutes and do not bypass or jumper the pressure switch.
- Check only the outdoor vent openings for obvious snow, ice, leaves, or nests before restoring power once.
How much does Daikin code E1 cost to fix?
A pressure switch replacement typically costs between $175 and $650 nationally.
When should I call a technician?
Call a technician if the code returns; the switch, hose, wiring, and inducer draft need testing.
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: AR9S/GR9S and matching Daikin DR-series single-stage controls that display this E-code.
- Goodman Manufacturing: Service and Troubleshooting
RS6621301 · Goodman/Amana AR9S and GR9S, and Daikin DR-series single-stage furnace controls; use only for the E-code entries explicitly listed in the manual.
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.