BoilerFaultCodesThe 6 most common faults
01
A 16 High DIY-safe
Your boiler's computer is experiencing a temporary glitch that has caused it to stop working for safety.
What to try first
Locate the reset button or dial on the front of your boiler control panel.Press and hold the reset button for 3 to 5 seconds.Wait 5 minutes to see if the boiler restarts and the code disappears.
02
E 37 High DIY-safe
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
What to try first
Locate the external filling loop, which is a flexible silver hose connected to two valves under the boiler.Gradually open the valves to let water into the system until the pressure gauge on the front reads between 1.0 and 1.5 bar.Close both valves tightly and ensure the pressure gauge stays steady.
03
A 01 High Engineer
Your boiler has failed to light because it cannot detect a flame, meaning you currently have no heating or hot water.
Full guide for A 0104
A 02 High Engineer
Your boiler is failing to light the flame properly after three attempts, which means it has safely shut down to prevent gas from building up.
Full guide for A 0205
A 08 High Engineer
Your boiler is failing to start because it cannot safely detect or ignite the internal flame.
Full guide for A 0806
A 09 High Engineer
Your boiler's internal computer is experiencing a memory error and can no longer safely control the system.
Full guide for A 09on the Vokera Verve I 50
Main Printed Circuit Board (PCB)Pressure relief valvePressure sensorExpansion vesselIgnition electrodeGas valve
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