A07
Ferroli Flow Temperature Sensor (NTC) Fault

Ferroli furnace displays A07 and will not fire; may occur intermittently during operation.

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Safety Warning

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.

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Possible Causes

Open-circuit or shorted Ferroli flow NTC sensor, Loose or corroded NTC wiring connector, Faulty control board NTC input circuit

How to Fix / Troubleshooting

Safety: Turn off power before removing any covers or disconnecting sensors.

Steps:

  • Locate the flow NTC: On most Ferroli units, the flow temperature sensor is clipped or screwed into the flow pipe leaving the heat exchanger.
  • Check wiring: Inspect the NTC connector and cable for damage, corrosion, or loose fit. Reseat the connector firmly.
  • Visual inspection: Look for signs of water ingress or scale around the sensor pocket. Dry any moisture and correct leaks.
  • Reset and test: Restore power and reset the unit. If A07 clears temporarily but returns, the sensor may be drifting out of range.

Professional help: A technician can measure the NTC resistance at various temperatures and compare to Ferroli specifications, replacing the NTC or control board as required.

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Repair Difficulty

Medium 3/5

Required Part

Flow NTC Temperature Sensor
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