Timer counts down but heater and fan cycle on and off rapidly, causing poor cooking performance.

Safety first: Unplug before accessing internal components.

• Listen for relay noise: During operation, repeated rapid clicking from the control board area indicates relay chatter.
• Inspect wiring: Check heater and sensor connections for looseness or corrosion, which can cause intermittent signals.
• Sensor test: Verify the NTC sensor is firmly mounted and its wiring intact. Replace if readings are unstable (requires multimeter and temperature reference).
• PCB inspection: Look for heat‑damaged or cracked solder joints around the heater relay. A technician can re‑solder or replace the relay, but most users should replace the entire PCB.

Erratic control can lead to undercooked or burnt food; address the underlying electrical issue rather than continuing to use the fryer.