How much does it cost to fix Viessmann error code 1E:1?

Cost varies. Contact a Gas Safe registered engineer for a quote.

1E:1 Low

Viessmann 1E:1 Fault Code

Q: What does the Viessmann 1E:1 fault code mean?

Your boiler is correctly identifying that it is running on LPG rather than mains natural gas, confirming that the initial installation settings match your fuel supply.

Also written as 1E1 — same fault.

The Viessmann 1E:1 fault code means: your boiler is correctly identifying that it is running on lpg rather than mains natural gas, confirming that the initial installation settings match your fuel supply.. It appears on 6 Viessmann models in our database.

Technical description: Operation with LPG

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Viessmann models that show the 1E:1 fault code

Click a model for the full fault code list and model-specific repair notes.

Vitodens 050-W
Vitodens 100-W / 200-W
Vitodens 200
Vitodens 200-W
Vitodens 222-W
Vitodens 333 Repair: £120-250

Source

Viessmann 1E:1 fault code information on this page is sourced and cross-checked against the official Viessmann service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026