Display and timer work, but the unit never reaches higher temperatures; it stays lukewarm.

Safety: Unplug and cool the unit before opening. Use caution around mains wiring.

Steps to troubleshoot weak heating:

• Check supply voltage: Test the wall outlet with a multimeter or another appliance to ensure proper voltage (typically 120V in North America).
• Inspect heater connections: Remove the bottom cover and examine heater terminals and connectors for discoloration or melting. Replace any overheated connectors and clean the terminals.
• Test element resistance: Measure resistance across the heating element. A significantly higher than normal resistance can reduce power; replace the element if out of spec.
• Inspect heater relay: On the control PCB, check the heater relay for signs of overheating or cracked solder joints. If the relay is chattering or not fully closing, replace the control board.

Note: Weak heating often precedes complete heater failure; addressing loose or burned connections early can prevent further damage.