Vokera Linea Plus AG Fault codes & diagnostics

15 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

Combi Natural Gas 30 kW 2000-2010 Discontinued
GC Number 47-094-31

Replaced by: Linea One

Download the Vokera Linea Plus AG manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Severity at a glance

Each cell = one fault code. Hover to identify.
2 Emergency 12 High 1 Medium
Versions & GC numbers

Which version do you have?

The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.

GC number Appliance (register name) Produced
47-094-31 Linea Plus AG 2000–2010
Just want the most common Vokera Linea Plus AG faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 15 documented codes

Tap any card for details

01

Your boiler has tried to light itself but failed, meaning it has temporarily shut down for safety and won't provide heating or hot water.

High DIY-safe £120-350

What to check first

  1. Check if other gas appliances, like a cooker, are working to ensure gas is reaching the property.
  2. Turn the mode selector dial to the 'OFF/RESET' position, wait for five seconds, then turn it back to the original position.
  3. If it is freezing outside, check that your white plastic condensate pipe has not frozen solid.

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • PCB (Control Board)

Related codes

Full explanation for 01
02

Your boiler has switched itself off because it has become too hot, usually because water isn't moving through the system properly.

High DIY-safe £120-£350

What to check first

  1. Turn the boiler off and wait at least 30 minutes for it to cool down.
  2. Check that your radiator valves are open and your system pressure is between 1 and 1.5 bar.
  3. Turn the control knob to the 'Reset' position, hold for a few seconds, then move it back to the 'ON' position.

Parts commonly replaced

  • Circulation pump
  • Overheat thermostat
  • Main heat exchanger (de-scale)

Related codes

Full explanation for 02
03

Your boiler has detected a problem safely clearing waste gases through the flue pipe, which has caused the system to shut down for safety.

High DIY-safe £150-350

What to check first

  1. Locate the mode selector switch on the front control panel.
  2. Move the switch to the 'OFF/RESET' position and wait for approximately 10 seconds.
  3. Move the switch back to either the 'Hot Water Only' or 'Heating and Hot Water' position to attempt a restart.

Parts commonly replaced

  • Fan assembly
  • Air pressure switch
  • Venturi tube

Related codes

Full explanation for 03
04

Your boiler has stopped working because the water pressure is too low for it to run safely.

High DIY-safe £0-120

What to check first

  1. Locate the filling loop (the flexible silver hose) under the boiler.
  2. Slowly open the valve or valves on the loop until you hear water moving.
  3. Watch the pressure gauge until it reaches between 1 and 1.5 bar, then close the valves completely.
  4. Turn the control dial to the 'Reset' position and then back to your original setting.

Parts commonly replaced

  • Filling loop
  • Expansion vessel
  • Pressure relief valve

Related codes

Full explanation for 04
05

Your boiler has experienced a lockout due to a failure to ignite or a flame being lost during operation.

High DIY-safe £100-280

What to check first

  1. Locate the mode selector switch on the front panel.
  2. Turn the switch to the 'OFF/RESET' position and wait for a few seconds.
  3. Turn the switch back to either 'Hot Water' or 'Heating and Hot Water' mode to restart the boiler.

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Printed Circuit Board (PCB)

Related codes

Full explanation for 05
06

Your boiler is struggling to accurately measure the temperature of your hot water, which usually means it cannot provide consistent heat when you turn on the taps.

Medium Engineer only £90-160

Parts commonly replaced

  • DHW NTC Thermistor
  • Wiring harness connectors

Related codes

Full explanation for 06
07

Your boiler has detected that a key temperature sensor has failed or disconnected, which is preventing the system from heating up safely.

High Engineer only £90-160

Parts commonly replaced

  • Primary NTC thermistor
  • Thermistor wiring harness

Related codes

Full explanation for 07
08

Your boiler has switched itself off because its internal burner has become too hot to operate safely.

High DIY-safe £100-280

What to check first

  1. Turn the mode selector switch to the 'OFF/RESET' position.
  2. Wait for approximately 30 seconds.
  3. Turn the switch back to either the 'Hot Water Only' or 'Heating and Hot Water' position.
  4. Ensure your radiator valves are open and the system pressure is between 1 and 1.5 bar.

Parts commonly replaced

  • Overheat Thermostat
  • Circulation Pump
  • Main Heat Exchanger

Related codes

Full explanation for 08
09

Your boiler has detected an internal electronic malfunction and has safely shut down to prevent any further issues.

High Engineer only £150-350

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Wiring harness

Related codes

Full explanation for 09
10

Your boiler has detected an internal electronic error within its control system that prevents it from operating safely.

High Engineer only £150-350

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

Full explanation for 10
A1

Your boiler has failed to light because it is not detecting a flame, meaning your heating and hot water have stopped working.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Printed Circuit Board
Full explanation for A1
A2

Your boiler is not working because it has detected an issue with the air flowing into or the gases flowing out of the unit, which has caused it to shut down for safety.

High Engineer only £120-250

Parts commonly replaced

  • Flue fan
  • Air pressure switch
  • Venturi
Full explanation for A2
A3

Your boiler is not venting exhaust gases properly, which prevents it from firing up to ensure your safety.

Emergency Engineer only £150-300

Parts commonly replaced

  • Flue fan
  • Air pressure switch
  • Venturi tube
Full explanation for A3
A4

Your boiler has detected that the flue gases are not being cleared away as they should be, causing it to shut down for safety.

Emergency Engineer only £150-300

Parts commonly replaced

  • Flue fan
  • Air pressure switch
  • Venturi
Full explanation for A4
C1

Your boiler has stopped working because it cannot detect that the flame is lighting or staying on as it should.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Printed Circuit Board (PCB)
Full explanation for C1
Status & diagnostic codes

1 operating states & engineer diagnostics

Not faults — these are normal operating states. Tap to expand.

CO Diagnostic Your boiler has been accidentally switched into a special testing mode used by engineers to check exhaust fumes, rather than operating normally to heat your home.