Ultrean Relay Operation / Thermal Expansion Noise

Air fryer makes a clicking sound repeatedly during operation.

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Possible Causes

Heater relay cycling on and off, Metal parts expanding and contracting, Loose internal screws or panels, Failing relay chattering due to low voltage

How to Fix / Troubleshooting

Safety: Unplug the unit before tightening any internal screws.

Steps to address clicking:

  • Identify type of click: Occasional clicks during heating are normal relay operations. Rapid, continuous clicking is not normal.
  • Check power supply: Ensure the fryer is on a stable outlet with proper voltage; low voltage can cause relay chatter.
  • Internal inspection: Remove the bottom cover and tighten any loose screws on the heater bracket, fan housing, and PCB mounts.
  • Board replacement: If the relay is chattering rapidly and the unit is not heating properly, replace the main control board.

Note: Some clicking is expected; focus on new, loud, or rapid clicking accompanied by performance issues.

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Repair Difficulty

Easy 2/5

Required Part

Main Control Board
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