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Vaillant Guide

Vaillant Fault Code Guide

Select your fault code below to see what it means, what might be causing it, and whether it's safe to fix yourself.

F.00

Heating Flow Sensor Short Circuit

Sensor Fault

The heating flow temperature sensor has short-circuited, so the boiler cannot read the flow temperature.

Possible Causes

  • •Heating flow NTC sensor short circuit
  • •Wiring fault between sensor and PCB
  • •Moisture on sensor connections

Can You Fix It Yourself?

No safe DIY fix — the sensor or wiring needs testing and replacement by a Gas Safe engineer.

Sahrsco Heating covers London and the surrounding area. Fast response, transparent pricing, Gas Safe registered engineers.

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