Weil-McLain
Unstable Flame or Safety Trip Without Display Code
Weil-McLain water heater’s burner starts but shuts down after a few seconds without showing a specific code; LED may blink briefly.
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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
Marginal flame sensor signal, Loose ground connection, Intermittent gas valve coil, Draft disturbances
How to Fix / Troubleshooting
Safety first: Turn off power and gas if you suspect unsafe operation.
- Clean and reposition flame sensor: Remove the flame rod, clean it with fine abrasive pad, and ensure it is fully in the flame path when reinstalled.
- Check grounding: Tighten all ground screws on the burner assembly, control, and junction box. Poor grounding can cause intermittent flame sensing.
- Inspect gas valve wiring: Ensure spade connectors on the gas valve are tight and not corroded.
- Observe venting: Sudden gusts or backdrafts can disturb the flame. Verify vent terminations are properly located and shielded per Weil-McLain instructions.
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Repair Difficulty
Hard
4/5
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