H2
Swan
Cavity Sensor Low Temperature / Open Circuit Error
Microwave displays H2 and will not start or stops during long cooking cycles.
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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 cavity temperature sensor, Broken sensor wiring, Loose connector on control PCB, Faulty control PCB input
How to Fix / Troubleshooting
Safety: Unplug the appliance before testing.
- Step 1 – Reseat connectors: Remove the outer cabinet and locate the cavity sensor connector on the control PCB. Unplug and replug it to ensure a good connection.
- Step 2 – Inspect wiring: Follow the sensor wires from the cavity to the PCB. Look for cuts, burns, or disconnections. Repair or replace damaged wiring.
- Step 3 – Test sensor continuity: Disconnect the sensor and measure resistance. An infinite reading indicates an open sensor; replace it with the correct Swan part.
If wiring and sensor are good, the control PCB may need replacement.
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Repair Difficulty
Hard
4/5
Required Part
Cavity Temperature Sensor
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