BoilerFaultCodes.com

Chaffoteaux Britony Duo 55 Fault Codes

Combi Natural Gas 24 kW Discontinued

This boiler uses indicator light combinations

Note which lights are on, off, or flashing and at what speed. Match the combination to the table below. Do not reset until you have noted the pattern. How to read fault codes →

Most common fault codes

8.1
Your boiler is failing to ignite its pilot flame, which means it cannot start the heating process needed for your hot water or radiators.
Gas Safe engineer required · £120-250
8.2
Your boiler is struggling to keep its pilot light lit, which is preventing the system from heating your water or home.
Gas Safe engineer required · £120-250
8.3
Your boiler is failing to keep its small starter flame lit, which prevents the main burner from igniting and stops your hot water and heating from working.
Gas Safe engineer required · £120-250

All 30 fault codes

Code Severity Plain English
8.1 High Your boiler is failing to ignite its pilot flame, which means it cannot start the heating process needed for your hot water or radiators.
8.2 High Your boiler is struggling to keep its pilot light lit, which is preventing the system from heating your water or home.
8.3 High Your boiler is failing to keep its small starter flame lit, which prevents the main burner from igniting and stops your hot water and heating from working.
8.4 High Your boiler is failing to keep its small pilot flame lit, which prevents the main burner from igniting and stops your heating and hot water from working.
8.4.1 High Your boiler is failing to ignite the flame required to produce heat or hot water.
8.4.2 High Your boiler is struggling to keep the burner alight when you turn on the hot water tap, causing the water to run cold.
8.5 High Your boiler is failing to ignite the flame needed to provide heating and hot water.
8.6 Medium Your boiler is struggling to operate because the manual gas control knob is stuck or physically jammed, preventing it from turning smoothly.
8.7 Medium Your boiler is struggling to reach the temperature it needs to provide hot water or heating effectively.
8.8 High The main gas control dial is stuck or difficult to turn, which means you cannot reliably switch your heating or hot water on or off.
8.9 Emergency Your boiler is not burning fuel correctly, which is causing soot to build up and indicates a dangerous risk of carbon monoxide production.
8.10 Emergency Your boiler's burner is failing to switch off even when it should, which can cause excessive heat or pressure build-up.
8.11 Emergency Your boiler is burning gas incorrectly, which is creating dangerous soot and could lead to carbon monoxide leaking into your home.
8.12 High Your boiler has detected that the water pressure inside the system has dropped too low, which prevents it from igniting and heating your home.
8.13 Medium Your boiler is struggling because there is air trapped inside the system or water is struggling to flow through it properly, causing rattling or banging sounds.
8.14 High Your boiler's air-moving fan is struggling or rattling, which could lead to your heating or hot water cutting out.
8.15 High Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
BUBNEB STAYS ON High Your boiler is failing to ignite properly because debris or trapped air is interfering with the gas or water flow, meaning your heating and hot water will not work.
EXPLOSIVE IGNITION Emergency Your boiler is struggling to light smoothly, causing a small 'pop' or bang sound when it tries to start instead of igniting quietly.
GAS CONTROL TAP STIFF (USER’S) Medium The dial you use to turn your boiler on or off has become extremely difficult to move, which likely means the internal lubricant has dried out or the knob was not put back on correctly after previous work.
HEATING BODY NOISE High Your boiler is making loud banging or kettling noises because of internal debris buildup, incorrect gas settings, or restricted water circulation.
INSUFFICIENT WATER FLOW High Your boiler is struggling to detect enough water flowing through it to safely turn on your hot water taps.
LOW WATER TEMPERATURE High Your boiler is not heating the water effectively because it is having trouble regulating the flow of gas or detecting the water movement required to trigger the heating process.
MAIN BURNER DOES NOT LIGHT High Your boiler is failing to ignite the flame needed to heat your water or home, meaning you currently have no heating or hot water.
PILOT FLAME DOES NOT LIGHT High Your boiler is failing to ignite because it cannot start the small pilot flame required to trigger the main burner.
PILOT WILL NOT STAY ALIGHT High Your boiler is failing to keep its small starter flame lit, which prevents the main system from firing up to provide you with heating or hot water.
POOR PILOT FLAME Emergency The small pilot flame that acts as a signal to ignite your boiler is too weak or flickering, so the system is shutting down for safety to prevent gas from escaping unburnt.
Red indicator - Lock out / flame failure High Your boiler has failed to light the flame properly and has automatically shut itself off for safety.
UNSTABLE FLAMES Emergency Your boiler is struggling to keep a steady flame, which suggests either moisture is trapped in the gas supply or the system cannot breathe properly through its exhaust.
YELLOW FLAMES / SOOT FORMED Emergency Your boiler is not burning fuel cleanly, which can create dangerous gases, so you should stop using it immediately.

Chaffoteaux Britony Duo 55 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.