Error code

Vaillant All models code 20

No approved translation for this record yet; showing the original text.

Meaning

Safety switch-off, temperature limiter

Member details

Signed-in members see the LED pattern and how to read the code with the remote control on eligible records.

Possible causes

Incorrect earth connection between cable harness and boiler, flow or return NTC defective (loose connection), black discharge via ignition cable, ignition plug or ignition electrode

Solution

Solution steps are not shared for faults that may be dangerous.

No do-it-yourself solution is given for this fault. For your safety, call an authorised service.

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