Boiler displays E19; burner output is reduced, and the error may be logged as a sensor discrepancy.

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

Faulty return NTC sensor, Poor circulation, Incorrect sensor placement, Control board fault.

Safety first: Isolate power before accessing sensors.

Bleed system: Remove air from radiators and high points to improve circulation.
Check valves: Ensure all isolation valves on the flow and return near the ACV boiler are open.
Visual sensor check: Confirm both flow and return NTCs are firmly attached to their pipes and wired correctly.
Professional diagnosis: A technician can compare sensor readings via the boiler diagnostics and replace the faulty NTC or address circulation issues.

Medium 3/5

Return NTC Temperature Sensor

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