Tesy Insulation Degradation or Local Overheating

Heater outer casing feels unusually hot to the touch.

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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

Internal insulation shifted or compressed, localized overheating near element flange, poor contact of thermostat or sensor, heater installed in confined space with poor ventilation

How to Fix / Troubleshooting

Safety first: Turn off power and allow the heater to cool. Avoid prolonged contact with hot surfaces.

Steps:

  • Check installation: Ensure adequate clearance around the heater as specified by Tesy. Improve ventilation if installed in a small cupboard.
  • Inspect flange area: Remove the lower cover and check for signs of overheating or burning near the element flange and wiring.
  • Verify thermostat and sensors: Ensure the thermostat and NTC sensors are properly attached to the tank and not hanging loose.
  • Insulation check: If accessible, verify that internal insulation has not been displaced. This may require partial disassembly and is best done by a technician.

Note: Mild warmth is normal, but very hot casing indicates a fault that should be corrected promptly.

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Repair Difficulty

Medium 3/5

Required Part

Thermal Insulation
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