E06
Tesy User Interface / Keypad Communication Error

Tesy water heater shows E06 and does not respond to keypad or touch controls.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Loose ribbon cable between display and main board, damaged touch panel, failed display PCB, control board communication driver fault

How to Fix / Troubleshooting

Safety first: Turn off power at the breaker. Do not remove the front panel while the unit is energized.

Steps:

  • Remove front cover: Access the display and keypad assembly. Carefully detach the decorative panel if needed.
  • Check ribbon cable: Locate the flat ribbon or multi-wire connector between the display board and main control board. Reseat both ends, ensuring the locking tabs are engaged.
  • Inspect for damage: Look for cracks on the display PCB, corrosion on connectors, or moisture traces. Dry any condensation and correct the source of moisture (e.g., poor sealing).
  • Test operation: Reassemble temporarily, restore power, and check if E06 clears and buttons respond.
  • Replace faulty UI module: If the error persists and the cable is intact, replace the Tesy display / user interface board as a complete assembly.

Technician note: If a known-good UI board still shows E06, the fault is likely on the main control board and it should be replaced.

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Repair Difficulty

Medium 3/5

Required Part

Display / User Interface Board
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