Vokèra · Unica i
A77 boiler fault code
Unica i28 / i32 / i36 combi
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What A77 means
Low temperature thermostat fault
Safe check
You can try one reset using the boiler's reset control. If the code returns or won't clear, contact a Gas Safe registered engineer.
When to contact an engineer
The code remains or returns after the step above, or no home step applies; arrange diagnosis by a Gas Safe registered engineer.
Safety notice
A boiler fault code alone is not a gas or carbon-monoxide emergency. If you smell gas, a CO alarm sounds, anyone feels unwell, or there is an unsafe flame, leave and call 0800 111 999 from outside.
Source and provenance
- Vokèra Unica i28 / i32 / i36 Users Instructions and Installation & Servicing Instructions · users’ “Fault codes” table, PDF p. 7; installer alarm table, PDF p. 30
users instructions and installation & servicing instructions
Cod. 20038660 - 10/13 - Ed. 5
Renting? Report it to your landlord or housing provider first. They are responsible for gas safety and boiler repairs, and the repair should not cost you.
Did this fix it?
After: Reset the boiler once