Bradford White
Nuisance Low Water Cutoff Trip
Boiler’s low water cutoff trips frequently even though the system appears full.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Improper LWCO installation height, Foaming or sludge in boiler water, Loose LWCO probe connection, Faulty LWCO electronics
How to Fix / Troubleshooting
Safety first: Turn off power. Low water cutoffs are safety devices; do not bypass them.
- Step 1 – Verify system pressure: Confirm that the pressure gauge shows normal operating pressure when the LWCO trips. If pressure is low, address fill issues.
- Step 2 – Inspect LWCO probe: On probe-type LWCOs, isolate and drain the boiler to below the probe. Remove the probe and clean any scale or sludge from the tip. Reinstall with proper sealing.
- Step 3 – Check wiring: Ensure the LWCO wiring to the control is tight and not corroded.
- Step 4 – Water quality (pro): Excessive foaming due to poor water quality can cause false trips. A professional may recommend flushing and treating the system water.
- Step 5 – Replace LWCO if faulty: If trips continue with proper water level and clean probe, replace the low water cutoff with a Bradford White-approved model.
Note: The LWCO protects against dry firing; never operate the boiler with it bypassed.
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Repair Difficulty
Hard
4/5
Required Part
Low Water Cutoff
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