Bradford White Error Code F10: Thermistor Short
How to Fix Bradford White Code F10
- Step 1: Turn the water heater off and back on again. This might reset the control and clear a temporary error. Wait a few minutes to see if the error returns.
- Step 2: Check the wiring around the water heater for any obvious damage or loose connections. Do not open the unit. Look for anything visibly disconnected.
- Step 3: If the error persists after resetting, contact a qualified HVAC technician to diagnose and repair the issue.
How to Reset Bradford White Code F10
- 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.
Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.
What Does Bradford White Error Code F10 Mean?
The F10 error code on your Bradford White tankless water heater indicates a short circuit in one of the thermistors. A thermistor is a type of resistor that changes its resistance with temperature. Your water heater uses thermistors to monitor the water temperature at various points in the system to ensure safe and efficient operation. When the control board detects a short, it shuts down the unit to prevent potential damage or overheating. This isn't necessarily dangerous in the short term, but it does mean your water heater won't operate until the problem is resolved.
Common Causes
- Failed thermistor (most common)
- Wiring harness damage or loose connection to the thermistor
- Moisture intrusion into the thermistor or wiring
- Control board failure
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| Unit displays F10 error | Measure resistance across the thermistor terminals at the control board (after disconnecting from the board). | Should read a specific resistance value based on the water temperature. Consult the service manual for the correct resistance/temperature chart. A reading of 0 ohms indicates a short. |
| Thermistor resistance is shorted | Inspect the wiring harness and connector for damage or corrosion. | Wiring and connector should be clean and undamaged. |
| Wiring is OK, thermistor is shorted | Replace the thermistor. | New thermistor should read correct resistance for the water temperature. |
| Error persists after thermistor replacement | Check voltage to the thermistor circuit from the control board. | Specified voltage from the board, per the service manual. |
Applicable Bradford White Models
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Thermistor | — | — | — |
| Wiring Harness | — | — | — |
| Control Board | — | — | — |
Related Codes on Same Models
Other codes that affect the same Bradford White model families as F10.
| Code | Description | Severity |
|---|---|---|
| F1 | Sensor Fault | Warning |
| F11 | Thermistor Open | Warning |
| F13 | Ignition Failure | Critical |
| F14 | Flame Failure | Critical |
| F16 | Blower Failure | Warning |
| F2 | Dry Fire Protection | Warning |
| F4 | High Temp Cutoff | Critical |
| F6 | Flammable Vapor Lockout | Critical |