Ferroli Intermittent Safety Lockout

Water heater frequently locks out and requires manual reset, but no consistent error code is shown.

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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 detection, Unstable gas supply pressure, Intermittent sensor wiring fault, PCB intermittent failure

How to Fix / Troubleshooting

Safety: Do not repeatedly reset without investigating the cause; this can mask a serious fault.

  • 1. Record conditions: Note when lockouts occur (time of day, other appliances running, weather) to help diagnose gas or flue issues.
  • 2. Inspect electrodes and sensors: Clean ignition and ionization electrodes and check all NTC and flow sensor connections.
  • 3. Gas supply check (technician): Have a gas technician verify stable inlet pressure and correct pipe sizing.
  • 4. PCB replacement: If all hardware checks out, an intermittent PCB fault may be the cause and require replacement.
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Repair Difficulty

Hard 4/5

Required Part

Ionization Electrode
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