1 steady flash = Normal operation. Same status indicator as State, AO Smith Signature, and Whirlpool — unit is functioning normally.
What 1 flash means
- Pilot is lit OR electronic ignition is ready
- Gas valve in standby
- No safety circuits tripped
- FVIR sensor normal
If you see 1 flash but no hot water
1 flash means the heater is healthy — the problem is downstream:
- Check thermostat setting on gas valve — set to 120°F or "C" (hottest is around "Very Hot")
- Verify the gas supply shutoff valve to the unit is fully open
- Test another hot tap (rules out a single fixture air-lock or cartridge issue)
- Bleed air — open a hot tap upstairs for 60 seconds
- Check mixing valve at the heater outlet (if installed)
Bottom line
1 flash = good. A hot water issue with 1-flash status is downstream of the heater (plumbing, mixing valve, thermostat setting).