Heater will not start and displays E10 immediately after power-up.

Safety first: Turn off power at the breaker before opening the control compartment. Electronic components are sensitive to static and incorrect wiring.

• Inspect wiring: Remove the front panel and visually inspect all harnesses between the Kripsol display module and main control board. Reseat multi-pin connectors firmly.
• Check supply voltage: Verify that the heater is wired for the correct voltage (e.g., 230 V single-phase) and that line and neutral are not reversed. Use a multimeter if you are qualified.
• Look for board damage: Examine the Kripsol control PCB for burn marks, swollen capacitors, or corrosion. Any visible damage usually requires board replacement.
• Power cycle: After reseating connectors, restore power and see if the error clears. If E10 persists, the control board is likely defective.
• Board replacement: Replacing the Kripsol main control PCB should be done by a qualified technician to ensure correct configuration and safe operation.