BoilerFaultCodes.com

Remeha Avanta 18V Fault Codes

System Natural Gas 18 kW Discontinued

Replaced by: Remeha Avanta Plus

The fault code is already on your display

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

Most common fault codes

8
Your boiler has temporarily stopped because it is struggling to move heat away from its internal parts, causing it to overheat slightly even when running at its lowest setting.
Gas Safe engineer required · £120-250
9
Your boiler has switched itself off because a safety switch or external control device connected to the system is preventing it from running.
Gas Safe engineer required · £120-250
b9
Your boiler has shut down because it is overheating or detecting that water isn't flowing through the system properly, so it is taking a short break to prevent damage.
Gas Safe engineer required · £120-250

All 64 fault codes

Code Severity Plain English
0 Low Your boiler is perfectly healthy and is currently sitting in standby mode, waiting for a signal from your thermostat to provide heating or hot water.
1 Low Your boiler is currently running its internal fan to clear air from the system before or after a burn cycle, which is a normal part of its operation.
2 Low Your boiler is currently just going through its normal startup sequence to light the flame.
3 Low Your boiler is perfectly fine, it is simply waiting for your room thermostat to reach the temperature you have requested.
4 Low Your boiler is currently busy warming up water for your taps, so it is temporarily delaying your heating until that process finishes.
5 Low Your boiler is perfectly safe and is simply taking a short, scheduled break before restarting itself automatically.
6 Low Your boiler is currently in standby mode because your room thermostat is telling it that the house is already warm enough.
7 Low Your boiler is continuing to circulate water after heating your hot water tank, which is a normal operation to ensure heat is transferred efficiently.
8 High Your boiler has temporarily stopped because it is struggling to move heat away from its internal parts, causing it to overheat slightly even when running at its lowest setting.
9 High Your boiler has switched itself off because a safety switch or external control device connected to the system is preventing it from running.
b5 Low Your boiler is simply taking a short, scheduled break because the water in your radiators has already reached the temperature set on the dial.
b8 Low Your boiler has temporarily paused heating because the water inside is already warmer than the temperature you have requested.
b9 High Your boiler has shut down because it is overheating or detecting that water isn't flowing through the system properly, so it is taking a short break to prevent damage.
E High Your boiler has lost its specific configuration settings and needs to be manually reprogrammed by a professional to function correctly.
E0 High Your boiler has lost the ability to read the water temperature, so it has shut down as a precaution to prevent overheating.
é0 High Your boiler has lost the ability to accurately measure the water temperature, so it has shut down to prevent potential overheating.
E01 High Your boiler is trying to start up, but it cannot successfully light the internal flame after several attempts, so it has shut down for safety.
E1 High Your boiler has detected an issue with the water circulation and has safely shut down, requiring a specific reset procedure to clear the fault.
é1 High Your boiler has switched itself off because it has detected that the water inside is getting too hot, likely due to low water pressure or trapped air in your radiators.
E02 High Your boiler has automatically shut down because it has detected that its internal water temperature has become dangerously hot.
E2 High Your boiler has detected that it is not heating the water effectively, often caused by trapped air in the system or a temporary lockout that requires a reset.
é2 High Your boiler has detected that hot water is flowing in the wrong direction or is blocked, which usually means the system lacks enough water or has trapped air preventing a proper flow.
E03 Emergency Your boiler has detected that the exhaust gases are getting too hot and has safely shut itself down to prevent damage or overheating.
E3 High Your boiler has detected an internal electrical fault with a temperature sensor, which has caused it to shut down for safety reasons.
é3 High Your boiler has detected an internal electrical safety fault or a problem with its 'brain' and has shut down to prevent damage or operation in an unsafe state.
E04 High Your boiler has failed to light after several attempts and has locked itself out for safety reasons.
E4 High Your boiler has stopped working because it can no longer accurately measure the temperature inside its internal heating component.
é4 High Your boiler has failed to light the flame after several attempts and has switched itself off to prevent a build-up of unburnt gas.
E05 High Your boiler's internal computer is experiencing a software or hardware failure and has shut down as a safety precaution to prevent incorrect operation.
E5 High Your boiler is failing to light the flame or keep it running, so it has safely locked itself off to prevent gas from escaping.
é5 High Your boiler is failing to light the flame or keep it running, so it has stopped working to keep your home safe.
E06 High Your boiler has detected a failure within its own brain, meaning it has safely shut itself down to prevent unpredictable operation.
E6 Emergency Your boiler is detecting a flame when it should be turned off, which indicates a serious internal safety fault.
é6 Emergency Your boiler has detected a flame firing when it shouldn't be, which is a safety concern that prevents the system from operating to protect your home.
E07 High Your boiler has detected that the water inside the system has become dangerously hot and has shut itself down to prevent damage or overheating.
E7 Medium Your boiler has detected air in the system or a circulation issue and has safely shut itself down to prevent damage.
é7 High Your boiler has detected that the water pressure inside the system is far too low to function safely.
E08 High Your boiler is shutting down because it cannot move the water around the system fast enough to keep it from overheating.
E8 High Your boiler has detected a problem with the internal fan unit, which is responsible for safely venting fumes outside, and as a safety precaution, it has stopped working to prevent unsafe operation.
E09 High Your boiler is overheating because water isn't moving through the system fast enough to transfer heat away from the burner.
E9 High Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage.
E10 High Your boiler has stopped working because the water pressure inside the heating system has dropped too low.
E11 High Your boiler's computer is experiencing an internal error and cannot operate safely, so it has shut itself down to prevent further damage.
E12 High Your boiler has automatically turned itself off because it has detected dangerously high temperatures inside the unit to prevent potential damage.
E13 High Your boiler has detected a faulty reading from its internal safety monitoring system, so it has safely shut down to prevent any potential overheating.
E14 High Your boiler is confused because its temperature measurement sensors have been installed in the wrong places or have become disconnected.
E15 High Your boiler has detected that the exhaust gases leaving the unit are dangerously hot, so it has safely shut itself down to prevent damage.
E16 High Your boiler has detected a faulty connection to the sensor that monitors the temperature of the exhaust fumes, causing it to shut down for safety reasons.
E31 High Your boiler has lost the ability to monitor the temperature of your hot water, which means it will stop providing hot water until the faulty sensor is replaced.
E32 High Your boiler's temperature monitoring system for the water returning to the unit has stopped working correctly, so the boiler has shut down to prevent potential overheating.
E34 High Your boiler is struggling to push air through the system correctly, so it has safely shut itself down to prevent an unsafe combustion issue.
E36 High Your boiler has failed to stay lit and has now locked itself out as a safety precaution, meaning you currently have no heating or hot water.
E37 High Your boiler has lost the ability for its internal computer boards to talk to each other, preventing it from starting safely.
E38 High Your boiler has lost the ability for its internal computer to 'talk' to its safety sensors, so it has shut down to keep you safe.
E39 High Your boiler has detected an external safety signal, such as a cold protection device or an add-on safety switch, that is preventing it from firing up.
E40 High Your boiler has detected an internal fault within its heat recovery system, which means it has safely shut itself down to prevent potential damage.
E41 Medium Your boiler is struggling to accurately measure the temperature of the water being heated for your taps and showers.
E42 High Your boiler is struggling to move water around your heating system effectively, which is causing it to shut down to prevent overheating.
E43 High Your boiler’s internal computer chip has encountered a memory error and cannot safely manage the system, meaning it has shut down to protect itself.
E44 High The boiler's internal computer has detected a contradiction in its settings, meaning it cannot safely start up and needs a professional to recalibrate the software.
e45 High Your boiler has lost its configured settings and needs to be manually reprogrammed by a professional to function correctly again.
f[ xx Low Your boiler is simply performing a routine system check or displaying its internal software version, which is a normal operation and not a fault.
OT ERROR Medium Your boiler's external temperature sensor and frost protection thermostat are sending conflicting signals to your heating controller.
p[ xx Low Your boiler is currently running a routine internal setup or air-clearing cycle and is operating normally.

Remeha Avanta 18V is discontinued — time for a new one?

Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.

UK's #1 online installer
Boxt
Fixed-price online quotes. Next-day installation.
Get a free quote →
Heatable
Instant online boiler quotes from £1,499.
Get a free quote →
iHeat
Fast installation. Price match guarantee.
Get a free quote →

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