Attack Sensor Calibration / Wiring Issue

Boiler display is on but shows incorrect or fluctuating temperatures.

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

Loose NTC sensor connections on Attack boiler, Damaged sensor cables, Moisture in sensor connectors, Failing NTC sensors

Safety: Isolate power before touching internal wiring.

Steps:

Inspect all NTC sensors: Check flow, return, and DHW sensors for secure mounting and dry, clean connectors.
Wiring check: Look for any crushed or abraded sensor cables.
Replace suspect sensors: If one sensor reading is clearly abnormal compared to others, replace that NTC with a genuine Attack part.

Medium 3/5

Flow NTC Temperature Sensor

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