Remeha Avanta 18V Fault codes & diagnostics

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

RegularSystem Natural GasLPG 18 kW 2007-2015 Discontinued

Replaced by: Quinta Ace

Download the Remeha Avanta 18V 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 12 High 1 Medium 6 Low
Just want the most common Remeha Avanta 18V faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 20 documented codes

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code9

Your boiler has switched itself off because an external safety device, such as a thermostat or pressure switch, has detected an issue and broken the electrical circuit.

High DIY-safe £80-200

What to check first

  1. Check if your room thermostat or programmer is set too low or has run out of batteries
  2. If you have underfloor heating, check if the floor has overheated and tripped the safety limit
  3. Reset the boiler by pressing the reset button for two seconds

Parts commonly replaced

  • External Limit Thermostat
  • Gas Pressure Switch
  • Wiring harness or connector

Related codes

Full explanation for code9
é 10

Your boiler has detected trapped air or a water flow issue and is running a temporary automatic process to clear it before attempting to heat up again.

Medium Engineer only £100-200

Parts commonly replaced

  • Central heating pump
  • System pressure sensor

Related codes

Full explanation for é 10
é 13

Your boiler has detected a critical internal fault linked to the main heating component and has safely shut itself down to prevent damage.

High Engineer only £300-600

Parts commonly replaced

  • Heat exchanger
  • Safety fuse
  • Thermal overheat sensor

Related codes

Full explanation for é 13
é0

Your boiler is perfectly healthy and is simply waiting for a signal from your thermostat to turn on the heating or hot water.

Low DIY-safe

What to check first

  1. Check your room thermostat is set to a higher temperature than the current room temperature
  2. Ensure your heating timer or programmer is set to 'On'
  3. If the boiler still does not fire, check your hot water tap or cylinder settings
Full explanation for é0
é1

Your boiler is currently going through its safety check phase before it attempts to light, which is a normal part of the startup process.

Low Engineer only

Parts commonly replaced

  • Air pressure switch
  • Fan
  • Printed Circuit Board

Related codes

Full explanation for é1
E2

Your boiler is struggling to ignite or keep the flame burning, and it is now trying to clear itself out before attempting to start again.

High DIY-safe £100-350

What to check first

  1. Check if other gas appliances, like a hob, are working to ensure there is a gas supply.
  2. If you have a prepaid meter, check that you have enough credit.
  3. Press the Reset button once to see if the boiler restarts.

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Flame sensing cable

Related codes

Full explanation for E2
é2

Your boiler has failed to light the flame needed to produce heat or hot water.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Ignition transformer

Related codes

Full explanation for é2
e3

Your boiler has detected an electrical safety issue where the power supply is not properly grounded or the internal control board has failed.

High Engineer only £100-£350

Parts commonly replaced

  • Control Unit (PCB)
  • Wiring Harness
  • Earth Connection/Ionisation Probe

Related codes

Full explanation for e3
é4

Your boiler has tried to light itself several times but has failed, likely because there is no gas supply or the ignition part is dirty or broken.

High DIY-safe £100-280

What to check first

  1. Check if other gas appliances in your home, like a hob, are working to ensure gas is reaching the property.
  2. If you have a prepayment meter, check that you have remaining credit and the valve is open.
  3. Press the Reset button on the boiler control panel for one to two seconds.

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • PCB (Printed Circuit Board)

Related codes

Full explanation for é4
Showing 11–20 of 20
é5

Your boiler is currently in a mandatory waiting period, meaning it is simply resting before it tries to restart itself.

Low Engineer only

Related codes

Full explanation for é5
é6

Your boiler is currently running its internal water circulation pump longer than expected after finishing a heating or hot water cycle, but this is usually just a system status notification rather than a breakdown.

Low Engineer only £80-150

Parts commonly replaced

  • Central heating pump
  • PCB

Related codes

Full explanation for é6
é7

Your boiler has detected that there is not enough water inside the system to operate safely, or the internal pump is struggling to move the water around.

High DIY-safe £120-250

What to check first

  1. Check your system pressure gauge; if it is below 1 bar, top up the water using your boiler's filling loop until it reads between 1 and 1.5 bar.
  2. Ensure all radiator valves and your isolation valves underneath the boiler are fully open.
  3. Turn the boiler off at the fused spur for 30 seconds, then switch it back on to reset the fault.

Parts commonly replaced

  • Circulating pump
  • Pressure sensor
  • Water pressure switch

Related codes

Full explanation for é7
é8

Your boiler has detected that the internal fan responsible for venting exhaust gases safely is either not spinning or communicating properly, so it has shut down to keep your home safe.

High Engineer only £180-350

Parts commonly replaced

  • Fan assembly
  • Wiring harness
  • Printed Circuit Board (PCB)

Related codes

Full explanation for é8
é11

Your boiler has detected that hot combustion gases are leaking into the internal casing, which is a serious safety concern that prevents the appliance from operating correctly.

Emergency Engineer only £180-350

Parts commonly replaced

  • Burner door seal
  • Heat exchanger seal
  • Flue seal

Related codes

Full explanation for é11
é43

Your boiler has detected that some of its internal settings have drifted outside of their safe operating limits, and it has stopped working as a precaution.

High Engineer only £120-250

Parts commonly replaced

  • Main PCB

Related codes

Full explanation for é43
é44

Your boiler has detected an internal software or settings error, which is preventing the system from starting up safely.

High Engineer only £120-250

Parts commonly replaced

  • Control board
  • Parameter key

Related codes

Full explanation for é44
ÿ5

Your boiler has temporarily paused heating because it has already reached the temperature you set, but it is currently waiting for a timed safety delay to finish before restarting.

Low Engineer only

Parts commonly replaced

  • None (this is an operational status, not a fault)
Full explanation for ÿ5
ÿ8

Your boiler's internal cooling and exhaust fan is unable to turn off, which is preventing the boiler from completing its safety cycle and stopping it from providing heat or hot water.

High Engineer only £180-350

Parts commonly replaced

  • Fan assembly
  • Printed Circuit Board (PCB)

Related codes

Full explanation for ÿ8
ÿ9

Your boiler has shut itself down because it cannot move water around the system fast enough, causing it to overheat rapidly.

High DIY-safe £120-250

What to check first

  1. Check that all your radiators have their thermostatic valves fully open
  2. Ensure your system pressure is set correctly, typically between 1.0 and 1.5 bar on the gauge
  3. Check that the external pump isolation valves have not been accidentally closed

Parts commonly replaced

  • Central heating pump
  • Plate-to-plate heat exchanger
  • NTC sensors

Related codes

Full explanation for ÿ9
Status & diagnostic codes

1 operating states & engineer diagnostics

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

OT ERROR Status Your boiler is staying on constantly because a safety sensor thinks the pipes are freezing, causing it to ignore your thermostat controls.