Boiler displays A07, domestic hot water NTC fault, DHW temperature control lost.

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

Open or shorted DHW NTC, Loose connector, Damaged cable, PCB input fault

Safety: Isolate power and water before removing sensors.

Check sensor connection: Ensure the DHW NTC is firmly connected and seated in its pocket.
Measure resistance: Compare the sensor resistance with Immergas specifications. Replace if out of range.
Inspect wiring: Repair or replace damaged cables.
PCB check: If the sensor and wiring are OK, replace the PCB if A07 persists.

Medium 3/5

DHW NTC Sensor

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