Weishaupt Storage Tank Heat Transfer / Insulation Fault

On storage-type Weishaupt water heaters, recovery time is very slow and stored water cools quickly.

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.

Possible Causes

Failed tank thermostat or sensor, Scale on tank coil, Circulation pump not running, Degraded tank insulation

Safety: Turn off power and allow the tank to cool before working on sensors or pipework.

Check tank temperature setting: Ensure the storage temperature is set correctly on the Weishaupt controller.
Inspect pump: On indirect systems, verify that the pump circulating between boiler and tank is running when there is a reheat demand.
Descale coil: In hard water areas, the tank coil may be scaled and require professional descaling.
Sensor check: Test the tank thermostat or NTC sensor and replace if readings are incorrect.

Hard 4/5

Storage Tank Thermostat / NTC Sensor

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