4 Flashes
Bradford White Water Heater
Severity: CriticalWhat Does This Error Mean?
Bradford White status LED flashing 4 times indicates the ECO — Energy Cut-Off — has tripped.
It is a manual-reset thermal switch that opens when tank temperature exceeds about 200°F.
Once tripped, the gas valve will not allow operation until the cause is diagnosed and the ECO is reset.
This is a real safety event, not a sensor glitch — find the cause before resetting.
Affected Models
- Bradford White Defender
- Bradford White ICON gas valve models
- Bradford White RG series
- Bradford White M-I series
Common Causes
- Gas valve stuck open
- Tank temperature probe scaled and reading low
- Thermostat set above 140°F combined with hot inlet water
- Sensor connector loose so the valve never sees the real temperature
- Recent water heater move where the ECO was bumped during transport
How to Fix It
-
Confirm the tank is cool.
Do not touch the gas valve immediately after a 4-flash trip — the tank water can be 200°F+.
Wait 1-2 hours minimum.
Test a hot tap before working on the heater. -
Remove the burner cover.
Switch the gas to OFF.
Remove the screws holding the burner access panel.
The ECO is the small disc with a red reset button, usually mounted near the bottom of the tank. -
Inspect the temperature sensor.
The temperature sensor lives in the same area.
Check that its connector is fully seated at the gas valve.
Wipe scale or moisture from the connector pins. -
Press the ECO reset.
Push the small red button firmly until you feel a click.
If it clicks immediately, the ECO is now reset.
If there is no click, the ECO is permanently failed and the gas valve assembly needs replacement. -
Reset gas valve, light, observe.
Reinstall the cover, follow the lighting sequence on the data plate, and bring the unit back online.
Watch the LED for an hour during a normal heat cycle.
If 4 flashes returns, the underlying cause was not corrected — call a plumber rather than reset again. -
Lower the thermostat.
Once running, set the thermostat to 120°F for daily use.
Higher settings move the heater closer to the ECO trip point and increase the chance of recurrence.
Frequently Asked Questions
Why is the ECO designed not to auto-reset?
An auto-reset would let a stuck gas valve cycle endlessly into a tank well above safe limits.
Manual reset forces a human to come and look at the cause first.
That is why pressing the button without diagnosis defeats the purpose.