E12
Insignia Convection Heater or Fan Error (Combo Models)

Microwave shows E12 and stops; may occur when using convection or grill functions on combo models.

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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

Open convection heater element,Failed convection fan motor,Defective convection thermostat,Loose wiring to heater assembly

How to Fix / Troubleshooting

Safety Warning: Unplug the microwave before any inspection. Heating elements and internal metal surfaces can remain hot after use.

User-level checks:

  • Allow the unit to cool completely, then try a standard microwave-only cook cycle. If microwave-only works but convection/grill fails with E12, the issue is in the convection system.
  • Ensure vents are not blocked and that the unit has proper clearance.

Technician-level steps:

  • Remove the outer cover and locate the convection heater and fan assembly (usually at the rear of the cavity).
  • Inspect wiring to the heater and fan for burns or loose connections.
  • Test the convection heater element for continuity; replace if open.
  • Check the convection fan motor for free rotation and proper resistance; replace if seized or open.
  • Verify the convection thermostat/thermal cutout is closed at room temperature.

Because convection systems run at high temperatures, use only OEM-rated replacement parts.

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Repair Difficulty

Hard 4/5

Required Part

Convection Heater Assembly
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