BoilerFaultCodes.com

Chaffoteaux Celtic 2 24 Rsc Fault Codes

Regular Natural Gas 24 kW Discontinued

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

2
Your boiler is struggling to keep the flame lit steadily, causing it to quickly turn off and on again, which means you currently have no reliable heating or hot water.
Gas Safe engineer required · £150-300
2a
Your boiler is making loud noises because the water pressure inside your heating system has dropped too low to operate correctly.
May be DIY safe · £0-90
2b
Your boiler is struggling to circulate water, which is causing a loud noise because the internal pump has stopped working.
Gas Safe engineer required · £150-250

All 47 fault codes

Code Severity Plain English
1 Medium Your boiler is struggling to circulate water properly through your radiators, causing it to run noisily because the water flow is restricted.
2 High Your boiler is struggling to keep the flame lit steadily, causing it to quickly turn off and on again, which means you currently have no reliable heating or hot water.
2a High Your boiler is making loud noises because the water pressure inside your heating system has dropped too low to operate correctly.
2b High Your boiler is struggling to circulate water, which is causing a loud noise because the internal pump has stopped working.
3 Medium Your boiler is struggling to circulate water properly because a mesh filter inside the system is clogged with debris, which is causing an unusual rattling or banging noise.
4 Medium Your boiler is making loud noises because a filter in your pipework is likely blocked or restricted, preventing water from flowing properly.
5 High Your boiler has detected that the water pressure inside the system has dropped too low to operate safely, or a valve is stuck open causing water to bypass the heating system.
5.i Medium Your boiler is struggling to deliver hot water because the internal mechanism that detects water flow is sticking.
5.ii Medium Your boiler is struggling to provide hot water because the incoming mains water supply pressure is too low for the system to detect or operate correctly.
5.iii Medium Your boiler is struggling to heat your tap water because a filter inside the unit where water enters has become clogged with debris.
5.iv High Your boiler is struggling to provide hot water properly because an internal component inside the burner area was incorrectly installed or replaced.
5.v High Your boiler has stopped providing hot water because a sensor is no longer correctly reading the water temperature.
5.vi High Your boiler is failing to switch on the components required to produce hot water, meaning you currently have no hot tap supply.
5.vii High Your boiler is struggling to detect a stable water flow when you turn on the hot tap, causing it to rapidly turn on and off.
5.viii High Your boiler is struggling to get enough gas from the supply to heat your water properly.
6 Emergency Your boiler is receiving too much fuel, causing it to run loudly and inefficiently, which suggests an issue with the gas valve or pressure settings.
6.i High Your boiler has stopped heating because it is not detecting enough water flowing through the system, which is a safety mechanism to prevent it from overheating.
6.ii High Your boiler is failing to start because the internal pump, which is responsible for moving water through your heating system, is stuck or blocked.
6.iii High Your boiler is failing to ignite because it cannot detect enough water pressure to run safely.
6.iv High Your boiler is failing to light the burner because it cannot detect that water is moving through the system to provide heating or hot water.
6.v High Your boiler has stopped heating your home because it is struggling to read the temperature correctly, causing it to shut down to prevent overheating.
7 Medium Your boiler is struggling to pump water efficiently because the flow is being restricted, causing it to make loud noises.
7.i High Your boiler has detected that the water pressure inside your heating system has become too high, causing a safety valve to release water to prevent damage.
7.ii Emergency Your boiler's internal pressure relief system has been triggered, meaning water is leaking out of a safety pipe outside your home because the pressure inside the system has become too high.
7.iii High Your boiler has built up too much internal pressure, causing a safety valve to release water to prevent damage.
7.iv High Your boiler is leaking internally, which is causing pressure to build up and trigger a safety drain to prevent damage.
8 High Your boiler has detected that the water inside the unit is getting too hot, so it has safely shut itself down to prevent damage.
8.i Medium Your boiler is struggling because there is trapped air circulating inside, which is causing the internal pump to make a loud, grinding, or rattling noise.
8.ii High Your boiler is struggling because trapped air is preventing water from circulating properly, which is making the pump sound noisy and preventing heating.
8.iii Medium Your boiler's water circulation system has become clogged with internal sludge or debris, making the pump struggle and create a grinding or rattling noise.
8.iv Medium Your boiler is struggling to circulate water because a internal mesh filter is clogged with debris, causing the pump to run loudly.
9 High Your boiler is overheating because it can't move the hot water away fast enough, causing it to shut down to prevent damage.
9.i High Your boiler is shutting down because it cannot circulate water properly, likely due to a buildup of debris blocking the internal flow.
9.ii High Your boiler is overheating because water isn't flowing through it properly, so it has safely shut itself down to prevent damage.
9.iii High Your boiler is overheating because it is burning too much gas, which has caused it to stop working to avoid potential damage.
10 Medium Your boiler is struggling to maintain a steady temperature, causing it to turn on and off rapidly instead of staying on consistently.
10.i Medium Your boiler is struggling to keep the water flowing at a steady rate, causing it to constantly turn on and off as it fails to regulate the temperature properly.
10.ii High Your boiler is struggling to maintain a steady temperature and is rapidly turning itself on and off because a internal safety sensor is incorrectly reporting that the system is overheating.
10.iii Medium Your boiler is struggling to maintain a steady temperature, causing it to turn on and off rapidly because water isn't moving through your heating system correctly.
10.iv High Your boiler is struggling to move heat away efficiently and is turning itself on and off rapidly to prevent overheating due to a blockage inside.
11 High Your boiler has detected a persistent fault in its internal control system that is forcing the air extraction fan to run constantly, which prevents the boiler from heating your home safely.
12 High Your boiler has lost the correct water pressure needed to run efficiently and will not provide heating or hot water until this is corrected.
13 High Your boiler is picking up excess water pressure, which suggests water is leaking internally into the heating system where it shouldn't be.
BURNER WILL NOT LIGHT - WITH PUMP RUNNING High Your boiler is trying to run but failing to start the flame, meaning you have no heating or hot water despite hearing the internal pump working.
PILOT GOES OUT WHEN GAS KNOB IS RELEASED High Your boiler is failing to stay lit because it cannot detect that a flame is present, causing it to automatically shut off the gas supply for your safety.
PILOT WILL NOT LIGHT High Your boiler is failing to ignite because internal air is preventing the gas from reaching the burner correctly.
PUMP NOT RUNNING High Your boiler's water pump is failing to start, which means the system cannot circulate hot water to your radiators or taps.

Chaffoteaux Celtic 2 24 Rsc 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.