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Wrong gas type

Fault shutdown or unusual noise — Using incorrect gas type

Vaillant · ecoTEC pro Boilers

What does Wrong gas type mean?

The boiler may shut down or operate with unusual ignition and combustion noise if the incorrect type of gas is being used. This can prevent proper and safe operation of the appliance.

Common Causes

  • Using an incorrect gas type (e.g., not propane G31)

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify that only propane gas G31 is being supplied to the boiler.

  2. 2

    Check the gas supply connection and ensure it matches the boiler's specifications.

  3. 3

    Affix the enclosed tank sticker (propane quality) to the tank or cylinder cabinet for clear visibility.

  4. 4

    If the wrong gas type was used, contact a qualified technician to inspect the boiler for any potential damage and adjust the settings if necessary.

Browse all codes in this manual (45)
Verified technical data. Last updated: April 2026

Related Faults

F.00F.00 — Flow temperature sensor interruptionF.01F.01 — Return temperature sensor interruptionF.10F.10 — Flow NTC short circuit
Source: Vaillant ecoTEC pro Boilers
Open Manual (Page 7)Search more codes in this manual