E19
Wolf Incorrect Line Voltage or Polarity

Furnace displays E19; unit may lock out after a brief attempt to start.

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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

Reversed line/neutral at furnace power connection, Loose neutral connection, Overvoltage or undervoltage supply, Shared neutral issues with other equipment

How to Fix / Troubleshooting

Safety: Only qualified persons should work on line-voltage wiring. Turn off power at the breaker before inspection.

  • Verify wiring: At the Wolf furnace junction box, confirm that hot (typically black) and neutral (white) are correctly connected per the wiring diagram. Ground must be securely attached to the chassis.
  • Check connections: Tighten all wire nuts and terminal screws. Look for signs of overheating.
  • Measure voltage: A technician should measure line voltage to ensure it is within the range specified by Wolf (typically around 120VAC). Correct any supply issues before operating the furnace.
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Repair Difficulty

Hard 4/5
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