BoilerFaultCodesThe 4 most common faults
01
Alarm system water pressure High DIY-safe
Your boiler has stopped working because the water pressure inside the heating system has dropped too low.
What to try first
Locate the internal filling loop beneath the boiler.Open the valves slowly to top up the pressure until the gauge reads between 1 and 1.5 bar.Close the valves tightly and press the reset button on the interface.
02
Alarm high limit thermostat High Engineer
Your boiler has detected that it is running too hot and has automatically shut down to prevent damage.
Full guide for Alarm high limit thermostat03
Fault sensors High Engineer
Your boiler's safety sensors have detected an issue, causing it to shut down to prevent potential damage.
Full guide for Fault sensors04
Temporary fault Low DIY-safe
Your boiler has detected a brief hiccup in its internal communication, but it is currently resetting itself to get back to normal operation.
What to try first
Wait five minutes to see if the error clears automaticallyTurn the boiler mode selector to 'Reset' for 10 secondsTurn the selector back to your preferred setting
on the Vokera Vibe 20A / 25A
Filling loopPressure relief valvePressure sensorLimit ThermostatPumpPCB
Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.
Call a Gas Safe engineer if…
- You can smell gas or see signs of a leak
- The Vokera shows an Emergency or High severity code
- The boiler keeps locking out after repeated resets
- You've tried the DIY checks and the fault hasn't cleared
- There's visible water leaking from the boiler
- The flame is yellow or orange instead of blue
Boiler cover options
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
Approved partner
Get a quote →
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Affiliate links. We may earn a commission at no extra cost to you.