F83 displayed, temperature rise at start-up is abnormal

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

Air in heat exchanger, Blocked or scaled heat exchanger, Pump not running (on system models), Incorrect sensor placement

Safety first: Turn off power and allow the unit to cool.

Bleed air: Bleed the heat exchanger and system thoroughly.
Check pump operation: Ensure the pump runs at start-up and is not seized.
Descale heat exchanger: If scale is suspected, perform a descaling procedure.
Verify sensor mounting: Ensure NTC sensors are correctly positioned and in good contact.

Warning: Repeated F83 faults indicate poor circulation; address promptly to avoid damage.

Medium 3/5

Primary Heat Exchanger

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