Common problems guide

The most common Vokera Unica MAX System problems

The faults most likely to send a Vokera Unica MAX System into lockout — with plain-English causes, what to check first, estimated repair costs and whether you need a Gas Safe engineer.

54 documented codes
6 most common
5 DIY-safe checks
1 engineer needed

The 6 most common faults

01
E041 High DIY-safe

Your boiler has detected that the water pressure inside the central heating system is too low.

What to try first

Locate the filling loop valves attached to your boiler or pipework underneath it.Open both valves slowly to allow mains water into the system, watching the pressure gauge on the boiler.Stop filling when the needle reaches between 1.0 and 1.5 bar, then firmly close both valves.

Parts
Water pressure transducer, Pressure sensor cable
Full guide for E041
02
E040 High DIY-safe

Your boiler has detected that the water pressure inside the system has dropped too low for it to operate safely.

What to try first

Locate the filling loop valves connected to your boiler.Open the valves slowly to allow water into the system until the pressure gauge reads between 1 and 1.5 bar.Close both valves tightly and reset the boiler.

Est. cost
£80-180
Parts
Water pressure sensor, Pressure transducer
Full guide for E040
03
E041 High DIY-safe

Your boiler has detected that the water pressure inside the system is too low to operate safely and efficiently.

What to try first

Locate the filling loop valves connected to your boiler or heating system.Open the valves gradually to allow mains water into the system, watching the pressure gauge.Stop filling when the pressure needle reaches between 1.0 and 1.5 bar, then firmly close both valves.

Parts
Water pressure sensor, Filling loop
Full guide for E041
04
E010 High DIY-safe

Your boiler has stopped working because it failed to ignite, meaning you currently have no heating or hot water.

What to try first

Check if your gas supply is working by testing another gas appliance like a hob.Locate the reset button on your Vokera boiler and hold it down for 3 to 5 seconds.Check that your pre-paid gas meter has credit if applicable.

Est. cost
£150-300
Parts
Ignition electrode, Gas valve, Printed Circuit Board (PCB)
Full guide for E010
05
E040 High DIY-safe

Your boiler has detected that the water pressure inside the system is too low to run safely and efficiently.

What to try first

Locate the filling loop connected to your boiler or check your user manual for repressurising instructions.Open the valves slowly to let water into the system until the pressure gauge reads between 1.0 and 1.5 bar.Close the valves tightly and reset the boiler using the reset button.

Est. cost
£90-180
Parts
Water pressure sensor, Filling loop
Full guide for E040
06
E010 High Engineer

Your boiler has stopped working because it tried to start up several times but failed to detect a safe flame.

Est. cost
£150-300
Parts
Ignition electrode, Gas valve, Printed Circuit Board (PCB)
Full guide for E010

on the Vokera Unica MAX System

Water pressure transducerPressure sensor cableWater pressure sensorPressure transducerFilling loopIgnition electrode

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

Avoid the next call-out bill

Monthly cover means no unexpected bills when your boiler breaks down.

Approved partner
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Get a quote →

Affiliate links. We may earn a commission at no extra cost to you.

See the full 54-code list for the Vokera Unica MAX System