F.83 error at startup, boiler may not fire or may short-cycle

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, Poor water circulation, Flow NTC not in good contact with pipe, Faulty flow NTC sensor

Safety: Allow boiler to cool and isolate power.

Steps:

Bleed air from the boiler and radiators.
Check system pressure and top up if low.
Ensure the flow NTC is firmly attached to the flow pipe with proper thermal paste or clip and insulated from ambient air.
Measure the flow NTC resistance and replace if out of specification.

If circulation issues persist, the pump or system may require professional attention.

Medium 3/5

Flow NTC Temperature Sensor

Check Price on Amazon

We may earn a commission from links on this page.