Display shows E15; unit may cycle on and off rapidly or fail to maintain temperature.

Safety: Turn OFF power at the breaker and verify with a tester. Elements operate at high current.

Diagnostic steps:

• Remove the front cover and visually inspect all heating elements and wiring for discoloration, burned insulation, or loose terminals.
• Tighten all element terminal screws to manufacturer torque specs.
• Disconnect power leads from each element and measure resistance across each element. Compare readings; a significantly higher resistance or open circuit indicates a failed element.
• Replace any defective heating element and any damaged wiring.
• If all elements test good, the triac or relay controlling one element bank on the control board may be faulty. Replace the main control board if necessary.
• Reassemble, restore power, and test for stable heating without E15.