Modern boilers are clever pieces of equipment, but when something goes wrong they tend to communicate through a mix of lights, flashing symbols, or boiler error codes. While these codes can look intimidating, many of them point to simple issues that you can diagnose at home before calling in a Gas Safe engineer. In areas like Bordon, Whitehill, Liphook, Alton, Farnham and the surrounding GU35, GU34 and GU9 districts, we regularly help homeowners reset minor faults that could have been resolved quickly with a few guided checks.
What boiler error codes actually mean
Boiler manufacturers use letters and numbers to identify specific faults. Codes like F22, E1, or ignition-related warnings usually relate to water pressure, sensor readings, or failed flame detection. Not all boiler error codes require professional attention; many are simply the boiler protecting itself until something is corrected.
Quick checks you can do now
Before diving deeper into individual faults, here are some safe, easy things you can check right away.
- Is the boiler switched on and receiving power?
- Is your room thermostat set high enough?
- Are your radiators or pipes unusually cold?
- Has your smart meter run out of credit?
- Do you see any visible leaks or dripping?
These simple checks alone can resolve a surprising number of issues in homes across Bordon and nearby towns.
Understanding boiler error codes
Here is a more detailed look at the most common examples and what you can safely do about them.
F22: Low water pressure
F22 is one of the most common boiler error codes and almost always means your system pressure has dropped too low. Most boilers operate best around 1.0–1.5 bar. Low pressure can occur after radiator bleeding, small evaporation losses, or a minor weep from a valve.
Try this:
- Check the pressure gauge on the front of your boiler.
- If it is below 1 bar, locate the filling loop (usually two small valves beneath the boiler).
- Open both valves slowly until the gauge reaches around 1.2 bar.
- Close both valves firmly.
- Press the reset button if required.
If the pressure keeps dropping, you may have a leak that needs a professional to trace — a common callout for homes in GU35 and GU9.
E1 or E119: General fault or lack of water
E1 codes can appear for several reasons, but a very frequent cause is the same low-pressure issue described above. If topping up the system restores operation, you can continue using the boiler normally. If the E1 code returns regularly, airflow sensors or thermistors may be involved and should be checked by a Gas Safe engineer.
Ignition failure or flame detection issues
Ignition-related faults often show as “IGN”, “E133”, “L2”, or a flame symbol that will not stop flashing. These usually indicate that the boiler tried to ignite several times but could not confirm the flame.
Safe steps you can try:
- Check your gas supply is on. If you have a gas hob, see if it lights.
- Ensure the external gas isolation valve (near your meter) is open.
- If you have a prepayment meter, confirm you still have credit.
- Reset the boiler once after confirming the above.
If there is no gas at all, your supplier may be experiencing a network issue. If the boiler repeatedly fails to ignite, stop resetting it and call a professional — ignition faults can relate to electrodes, burners, or internal components that require specialist tools.
Overheating warnings and sensor errors
Overheat codes usually appear when the boiler detects temperatures that are too high for safe operation. This can occur if a pump is not circulating water properly, if there is an airlock, or if sludge has built up inside radiators.
A simple checklist you can run through:
- Are your radiators all warm or are some completely cold?
- Are any radiators hot at the top but cold at the bottom?
- Is the boiler making unusual kettling or whistling sounds?
- Is the pressure too high (above 2.5 bar)?
Bleeding radiators can release trapped air and help restore circulation. However, if your pump is struggling or your system is heavily sludged, you will need an engineer to diagnose the cause. We see this frequently in older properties around Liphook and Alton.
Frozen condensate pipe warnings
In winter, one of the most common reasons boilers stop working is a frozen condensate pipe. This often triggers generic fault codes or ignition failures. The pipe usually runs outside and is fairly easy to locate.
You can try:
- Pouring warm (not boiling) water over the visible section of the pipe.
- Gently wrapping it with a hot water bottle or warm towel.
- Resetting the boiler after thawing.
Once it is flowing, the boiler should restart. If the pipe freezes frequently, upgrading insulation can prevent future issues.
How to safely reset your boiler
Most boilers have a simple reset button. Press it once and wait for the system to complete its ignition sequence. Avoid repeatedly pressing reset because persistent faults need proper investigation to stay safe and avoid damage.
When it is time to call a professional
There is a limit to what a homeowner can safely fix, and anything beyond basic pressure checks, thermostat adjustments, or frozen pipe clearance should be handled by a qualified Gas Safe engineer. Persistent boiler error codes usually indicate sensor or component faults that require professional tools and testing.
Next steps
If you need help resolving a recurring boiler fault, reach out to us at https://www.embassygas.com/book