What does the Vaillant F.83 fault code mean?

Your boiler is not detecting enough water circulating inside the system to safely turn on the burner.

How much does it cost to fix Vaillant error code F.83?

Typical repair cost for the Vaillant F.83 fault is £120-250 including labour.

Vaillant F.83 Fault Code: What It Means & How to Fix It

What the manual says

Manufacturer manual

Fault: Dry fire. When the burner starts, the temperature change registered at the flow or return temperature sensor is non-existent or too small: Insufficient water in the product, the flow or return temperature sensor is not in the correct position on the pipe

Shared across the ecoTEC plus range

This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register →

Boiler cover options

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All 72 fault codes on the ecoTEC plus 415 VU 156/6-5

Seeing a different code? Every code this model can display, in one place.

Your boiler is not detecting enough water circulating inside the system to safely turn on the burner.

What the manual says

Engineer required

Avoid the next call-out bill

All 72 fault codes on the ecoTEC plus 415 VU 156/6-5

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