Heater displays E06; unit may power on but will not heat.

Safety: This involves mains voltage. Isolate power at the breaker and verify with a meter before touching any internal wiring.

• 1. Visual inspection of elements: Remove the cover and inspect the heating element block. Look for burned connectors, melted insulation, or signs of leakage.
• 2. Tighten terminals: Check all screw terminals feeding the heating elements. Tighten any loose connections to the manufacturer’s torque specification.
• 3. Measure element resistance: Disconnect the element leads and measure resistance across each element with a multimeter. Compare to Kospel’s specified values. Replace any element that is open or significantly out of range.
• 4. Check for earth leakage: Measure resistance between each element terminal and earth. Very low resistance indicates a grounded element that must be replaced.
• 5. Control board output: If elements test good, the fault may be in the power relays or triacs on the main PCB. Inspect for burned spots or cracked solder joints. Replacement of the board is usually required.

Do not operate the heater with disconnected or partially failed elements; this can cause further damage.