Vokera Linea 24 Fault codes & diagnostics

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

Combi Natural Gas 24 kW 1998 onwards Discontinued
GC Number 47-094-27
Download the Vokera Linea 24 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.
8 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
47-094-27 Linea Linea 24 1998–present
Just want the most common Vokera Linea 24 faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 9 documented codes

Tap any card for details

01

Your boiler is unable to light the flame needed to heat your water and home.

High DIY-safe £100-280

What to check first

  1. Check if other gas appliances, like a hob, are working to confirm gas supply
  2. Ensure your prepaid gas meter (if applicable) has credit
  3. Rotate the mode selector switch to the 'Reset' position for a few seconds, then back to its original setting

Parts commonly replaced

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

Related codes

Full explanation for 01
02

Your boiler has shut down because it has detected it is getting too hot, triggering a safety switch to prevent damage.

High DIY-safe £90-180

What to check first

  1. Check that your radiator valves are open to allow water to flow.
  2. Ensure your system pressure is between 1.0 and 1.5 bar on the pressure gauge.
  3. Wait for the boiler to cool down and try turning the mode selector switch to 'Reset'.

Parts commonly replaced

  • Limit Thermostat
  • Circulation Pump
  • Heat Exchanger (Descaling)

Related codes

Full explanation for 02
03

Your boiler has detected an issue with how it is getting rid of exhaust fumes, which has caused it to shut down for safety.

High Engineer only £100-£240

Parts commonly replaced

  • Differential Air Pressure Switch
  • Fan
  • Venturi Tube

Related codes

Full explanation for 03
04

Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.

High DIY-safe £0-120

What to check first

  1. Locate the filling loop (usually a silver flexible hose) underneath or near the boiler.
  2. Open the small valves on the filling loop slowly until you hear water entering the system.
  3. Watch the pressure gauge and close the valves tightly once the needle reaches 1.5 bar.

Parts commonly replaced

  • Filling loop
  • Pressure sensor
  • Expansion vessel

Related codes

Full explanation for 04
05

Your boiler has detected a problem with the flame ignition or detection system and has safely shut itself down to prevent a gas buildup.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Flame rectification probe
  • PCB
  • Gas valve

Related codes

Full explanation for 05
06

Your boiler's temperature sensor for hot water has stopped working correctly, meaning your taps and showers may not get warm or could stay cold.

Medium Engineer only £90-160

Parts commonly replaced

  • Domestic Hot Water (DHW) NTC Thermistor
  • Wiring harness connection

Related codes

Full explanation for 06
07

Your boiler has shut down because a sensor detected that the water inside has become far too hot.

High DIY-safe £100-£220

What to check first

  1. Turn the boiler off at the electrical switch or dial.
  2. Ensure all radiator valves are fully open to allow heat to dissipate.
  3. Wait 20 minutes for the system to cool, then turn the boiler back on and rotate the mode selector to the 'reset' position.

Parts commonly replaced

  • Primary NTC Thermistor
  • Circulation Pump
  • Limit Thermostat

Related codes

Full explanation for 07
C1

Your boiler's internal computer has flagged a critical error that prevents it from starting up reliably.

High Engineer only £250-450

Parts commonly replaced

  • Main PCB (Printed Circuit Board)
Full explanation for C1
L2

Your boiler has stopped working because it cannot sense a flame, meaning it is locked out for safety reasons.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • PCB

Related codes

Full explanation for L2
Status & diagnostic codes

5 operating states & engineer diagnostics

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

CO Diagnostic Your boiler is currently running a self-diagnostic test or combustion check and does not have a functional fault. JP6 Diagnostic Your boiler's internal setting that helps provide instant hot water has been switched off or is not being recognised. JP8 Diagnostic Your boiler has lost its internal configuration settings, meaning it has forgotten whether it should be running on natural gas or LPG, or is experiencing a communication fault with its control settings. JP9 Diagnostic Your boiler's internal settings have become confused due to a misplaced internal electronic pin, which is preventing the heating system from switching on correctly. L1 Status Your boiler has detected an internal issue and is preventing itself from igniting to stay safe.