Smell gas? Leave the property and call the National Gas Emergency line on 0800 111 999

A77

Vokera fault code

Vokera A77: low temperature thermostat fault

Engineer only

The boiler has a fault with its low temperature thermostat.

What you can safely do

There is nothing you can safely do yourself with this one. Leave the boiler off and book an engineer.

Find a Gas Safe engineer near you Opens the official Gas Safe Register search.

Applies to: Vision and Compact A. Codes can differ between models, so check your manual.

From Vokera's own fault tables. Your model name is usually on the front of the boiler or in the user manual.

Model	Meaning
Vision and Compact A	Low temperature thermostat fault

Can I fix A77 myself?

No. It needs a Gas Safe registered engineer.