Vokera Linea Max Fault codes & diagnostics

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

Combi Natural Gas 35 kW 1999-2010 Discontinued

Replaced by: Linea HE

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

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Severity at a glance

Each cell = one fault code. Hover to identify.
1 Emergency 19 High
Just want the most common Vokera Linea Max faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 20 documented codes

Tap any card for details

01

Your boiler has failed to light the gas burner, which means you will not have any heating or hot water at the moment.

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. Press the 'Reset' button and hold it for a few seconds to try and restart the ignition sequence.
  3. Verify that your gas meter has credit if you use a pre-payment meter.

Parts commonly replaced

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

Related codes

Full explanation for 01
02

Your boiler has sensed it is getting too hot, usually because the water inside isn't moving around the system correctly.

High DIY-safe £120-350

What to check first

  1. Check that your radiator valves and the boiler isolation valves are fully open
  2. Ensure your system water pressure is between 1 and 1.5 bar on the pressure gauge
  3. Wait for the boiler to cool down completely, then turn the control knob to the 'Reset' position for a few seconds

Parts commonly replaced

  • Circulation Pump
  • Overheat Thermostat
  • Main Heat Exchanger

Related codes

Full explanation for 02
03

Your boiler is struggling to clear exhaust fumes safely, which has caused it to shut down for protection.

High Engineer only £150-£450

Parts commonly replaced

  • Fan assembly
  • Air pressure switch
  • Ventuuri tube

Related codes

Full explanation for 03
04

Your boiler has detected that the water pressure is too low or your water isn't moving through the system properly to operate safely.

High DIY-safe £60-220

What to check first

  1. Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.
  2. If the pressure is low, use the filling loop valves under the boiler to top it up until the needle reaches 1.2 bar.
  3. Turn the mode selector switch to the 'OFF/RESET' position and then back to 'ON' to clear the fault.

Parts commonly replaced

  • Filling loop
  • Flow switch
  • Circulation pump
  • Pressure sensor

Related codes

Full explanation for 04
05

Your boiler's internal computer has developed a fault and is unable to communicate correctly with the rest of the system.

High Engineer only £280-£450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Wiring Harness

Related codes

Full explanation for 05
06

Your boiler has failed to ignite or has lost its flame, and it needs to be manually reset to try and spark back into life.

High DIY-safe £80-250

What to check first

  1. Locate the mode selector switch on the front panel.
  2. Turn the dial to the 'OFF/RESET' position and wait for 5-10 seconds.
  3. Turn the dial back to the 'Heating' or 'Hot Water' position and check if the boiler fires up.

Parts commonly replaced

  • Ignition Electrode
  • Spark Leads
  • Gas Valve

Related codes

Full explanation for 06
07

Your boiler has lost its ability to measure the temperature of the water leaving the unit, usually due to a faulty internal sensor or a loose wire.

High Engineer only £90-160

Parts commonly replaced

  • Flow NTC Thermistor
  • Wiring Harness Connection

Related codes

Full explanation for 07
08

Your boiler's internal computer parts are having trouble communicating with each other, meaning the system cannot safely start up.

High Engineer only £180-450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Communication wiring harness
  • Display board

Related codes

Full explanation for 08
10

Your boiler is failing to light the gas or cannot stay lit, meaning you currently have no heating or hot water.

High DIY-safe £125-£350

What to check first

  1. Check if other gas appliances, like a hob, are working to ensure gas is being supplied to the home.
  2. Ensure your gas meter has credit if you are on a pre-payment meter.
  3. Press the 'Reset' button on the front of the boiler once to see if the system restarts.

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Flame Sensing Lead
  • Printed Circuit Board (PCB)

Related codes

Full explanation for 10
12

Your boiler is struggling to push water around your heating system, so it has safely shut down to prevent damage.

High Engineer only £180-350

Parts commonly replaced

  • Circulating pump
  • Flow switch
  • Diverter valve

Related codes

Full explanation for 12
Showing 11–20 of 20
13

Your boiler is struggling to manage the water pressure in the system, which can cause it to stop working safely to prevent internal leaks.

High Engineer only £150-250

Parts commonly replaced

  • Expansion vessel
  • Pressure relief valve
  • Flexible pipework

Related codes

Full explanation for 13
14

Your boiler has stopped working because it can no longer accurately measure the temperature of the water flowing through your heating system.

High Engineer only £120-£200

Parts commonly replaced

  • NTC Flow Thermistor
  • Wiring harness

Related codes

Full explanation for 14
15

Your boiler is struggling to detect the temperature of your hot water, which means it has stopped providing hot water to your taps and shower.

High Engineer only £120-220

Parts commonly replaced

  • DHW NTC thermistor
  • Wiring harness

Related codes

Full explanation for 15
16

Your boiler is having trouble controlling the flow of hot water through your radiators, which means it has stopped heating to prevent potential damage.

High Engineer only £150-250

Parts commonly replaced

  • Diverter valve actuator
  • Diverter valve cartridge

Related codes

Full explanation for 16
17

Your boiler is struggling to detect the flow of water returning from your radiators, which prevents it from heating your home properly.

High Engineer only £150-250

Parts commonly replaced

  • Return NTC thermistor
  • Wiring harness
  • PCB

Related codes

Full explanation for 17
18

Your boiler has detected that the water pressure inside the system is dangerously high, causing a pressure relief valve to activate to prevent damage.

Emergency Engineer only £120-250

Parts commonly replaced

  • Pressure Relief Valve
  • Pressure Gauge
  • Expansion Vessel
Full explanation for 18
20

Your boiler has sensed it is getting too hot and has automatically shut down to prevent damage or safety issues.

High DIY-safe £100-280

What to check first

  1. Check that all radiator valves are fully open to allow water to circulate.
  2. Ensure there is enough pressure in the system by checking the gauge is between 1 and 1.5 bar.
  3. Gently press the 'Reset' button on the control panel once the boiler has cooled down.

Parts commonly replaced

  • Overheat Thermostat (Limit Statutory)
  • Circulation Pump
  • Thermistor (NTC Sensor)

Related codes

Full explanation for 20
23

Your boiler has built up too much internal water pressure and is releasing it through a safety valve to prevent damage.

High DIY-safe £120-280

What to check first

  1. Check that the filling loop valves are fully closed and not letting in more water
  2. Bleed water from a radiator to reduce the system pressure to between 1.0 and 1.5 bar
  3. Check the external copper discharge pipe for signs of dripping
  4. If the pressure continues to rise or the valve leaks, call a Gas Safe engineer

Parts commonly replaced

  • Expansion Vessel
  • Pressure Relief Valve (PRV)
  • Filling Loop

Related codes

Full explanation for 23
24

Your boiler has detected that the water pressure inside the system is too low and has switched itself off as a safety precaution.

High DIY-safe £0-120

What to check first

  1. Locate the filling loop (the flexible silver hose) underneath or near the boiler
  2. Slowly open the one or two taps/valves until you hear water entering
  3. Watch the pressure gauge until it reaches between 1 and 1.5 bar, then close the valves tightly

Parts commonly replaced

  • Filling loop
  • Pressure sensor
  • Expansion vessel
Full explanation for 24
30

Your boiler has failed to light the flame, so it has purposefully shut down to prevent gas from building up inside.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • PCB

Related codes

Full explanation for 30
Status & diagnostic codes

1 operating states & engineer diagnostics

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

25 Status Your boiler has detected that it is getting too cold and is running automatically for a short time to prevent the internal pipes from freezing.