A. O. Smith Edr Error Code: Not enough water in tank (dry fire)
Updated October 2026 · Sourced from A. O. Smith documentation
🧭 Check a few things first
The guide says there is not enough water in the tank (tank not full), also called dry fire.
Is it safe to keep running? Check the steps below first. If the code stays after the tank is full, call a qualified person.
Edr at a glance
| Code / how it shows | Meaning | Applies to |
|---|---|---|
| Edr Shown on the water heater display | Not enough water in tank (dry fire) | A. O. Smith Hybrid Electric Heat Pump water heaters (Voltex), Installation Instructions and Use & Care Guide 100269085 |
Check this first
Only steps a homeowner can do safely. Do not open electrical panels or the burner area.
- Check the cold water supply valve to the heater is fully open.
- Open all hot water taps in the home and run them until water flows steadily, as the guide says.
🛑 Stop and call a licensed pro if
- If the code stays after the tank is full, call a qualified person.
- You smell gas. Leave the house, do not touch switches, and call your gas utility from outside.
- Codes for flame failure, overheating, venting or the control board that return after one reset.
- Water leaking from the heater, the relief valve discharging, or scorching around the burner area.
- A carbon monoxide alarm sounds. Get everyone outside and call 911 or the fire department.
Safe first steps for any A. O. Smith code
- Write down the exact code shown on the controller or the number of status light flashes.
- Turn the water heater power off and back on (or press the reset button the manual describes) once. If the code comes back, stop resetting.
- Make sure the gas supply valve to the heater is open and other gas appliances in the home are working.
- Make sure the cold water supply valve is fully open and hot water taps are not partly closed.
- Look at the outside vent terminal for snow, ice, leaves or anything blocking it (look only).
Source: A. O. Smith Hybrid Electric Heat Pump Water Heater Use and Care Guide 100269085, Diagnostic Codes, p. 20. Codes are series-specific, so your unit's own manual is the final word. Reviewed October 2026.
Ryan Giles · Red Seal Certified Plumber · Ask a plumber · Ask an HVAC technician
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