Vokera boilers covered on this site
Vokera is a well established boiler brand in the UK and Ireland. The ranges we get asked about most are the Vision and Vision Plus, the Compact and Compact A, the Unica and Unica MAX, the Evolve, the Easi-Heat and Easi-Heat Plus, and the Mynute. Most come as combi boilers, and several also come as system or regular versions.
Recent Vokera ranges share a very similar alarm code list, so an A04 on a Vision Plus usually means the same as an A04 on an Evolve or Easi-Heat Plus. Older boilers and some specialist models can use different codes, so always check the fault code table in your own user manual before acting on a code.
Where the fault code appears
On most current Vokera models the code shows on the digital display on the front control panel. Alarm codes start with the letter A, for example A01 or A04. Some models also light a red fault symbol or LED when the boiler has locked out and needs a manual reset. Not every symbol is a fault: a P, for example, means the preheat function is active. Write the code down exactly as it appears, because it saves an engineer time.
How to reset a Vokera boiler safely
The reset method depends on the model. Many Vokera boilers have a dedicated reset button that you press and hold for a few seconds. Others, including some Compact and older models, are reset by turning the mode selector dial to the reset position for a few seconds and then back again. Your user manual shows which applies to your boiler.
- Deal with the likely cause first, such as low pressure, a gas supply problem or a frozen condensate pipe.
- Reset once and give the boiler a few minutes to run through its start-up sequence.
- Stop after two or three attempts. If the code keeps coming back, call a Gas Safe registered engineer.
Never remove the casing to look for the problem yourself. Everything behind the front panel is a job for a qualified engineer.
Reading the pressure gauge
Vokera combi and system boilers have a pressure gauge on the front or underneath the boiler, and some newer models show the pressure on the display. Vokera user manuals say the gauge should read between 1 and 1.5 bar when the boiler is off and has cooled down. It rises a little when the heating is hot, which is normal. If it drops too low, the boiler stops and shows the A04 low pressure code. Our guide on how to repressurise a boiler explains how to use the filling loop.
Common winter faults
Winter brings two familiar problems. The first is a frozen condensate pipe: where it runs outside, a hard frost can freeze it and stop the boiler firing, which can show up as an ignition code such as A01. Thawing it with warm (not boiling) water is a safe job for a homeowner, and our frozen condensate pipe guide shows how. The second is low pressure, because heavy heating use and bled radiators both lower the pressure over time.
Vokera fault codes we cover
- A01: ignition failure, where the boiler tries to light but no flame is sensed. Often a gas supply or condensate problem.
- A03: fan fault, where the boiler cannot confirm the fan is running at the right speed.
- A04: insufficient system water pressure, usually fixed by topping up with the filling loop.
When to call an engineer
If you smell gas, turn off the supply at the meter if it is safe to do so, open doors and windows, and call the National Gas Emergency Service on 0800 111 999. For anything beyond the basic checks above, or if a fault returns after two or three resets, book a Gas Safe registered engineer. A yearly service catches many faults early; see our boiler service cost guide.