Bradford White Error Code F4: High Temp Cutoff
How to Fix Bradford White Code F4
- Step 1: Check the water heater's vent for any obstructions (leaves, debris, animal nests). Clear any blockages you can safely reach from the outside.
- Step 2: If you have hard water, consider flushing the tank to remove sediment. Refer to your owner's manual for instructions, or search online for a video specific to your Bradford White model.
- Step 3: Contact a qualified HVAC technician or plumber to diagnose and repair the underlying problem. Do not attempt to reset the high-limit switch yourself.
How to Reset Bradford White Code F4
- Turn off the unit using the power button on the front panel.
- Turn off the gas supply valve.
- Turn off the circuit breaker supplying power to the unit. Wait 30 seconds.
- Restore power at the breaker, then open the gas valve.
- Turn the unit back on. If the error returns, the underlying issue needs repair.
What does F4 mean?
The F4 error code on your Bradford White water heater indicates that the high temperature limit switch has tripped. This safety device is designed to shut off the gas supply to the burner if the water temperature exceeds a safe level, typically around 190°F (88°C). When this happens, the heater locks out to prevent further operation until the issue is resolved. This is a critical safety feature, and the underlying cause needs to be identified and corrected to prevent potential scalding, damage to the unit, or even a dangerous situation like a steam explosion.
Essentially, something is causing the water to overheat. This could be a problem with the thermostat not regulating the burner correctly, a blockage preventing proper water flow, or even a faulty high-limit switch itself. Because this involves gas and high temperatures, it's important to address this issue promptly and safely.
Affected Models
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| High Limit Switch | — | — |
| Thermostat | — | — |
| Gas Valve | — | — |