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Boilers can show error codes from time to time. Some problems are easy to fix and you can carry out a few simple steps to do it yourself, while others need to be sorted out by a Gas Safe registered engineer. This article will help you determine whether there’s a problem with your boiler, gas supply or heating system and how to resolve it.

Most error codes will appear on the facia display as either two or three numbers, preceded by the letter ‘E’.

Here is a list of some of the most common error codes, and the recommended action to take. If the error code persists or does not indicate an issue you can fix yourself, please call Plus Heat on 0808 164 2892 and we can arrange for one of our Gas Safe engineers to visit.

Common Error Codes

E110, E125, and E131

• Boiler: Generic
• Recommendation: Bleed radiators & reset

These 3 separate boiler error codes indicate overheating. To resolve this, bleed your radiators of air and reset the boiler. The error code should then disappear. E110, E125, and E131 error codes signify potential overheating issues in boilers. To resolve this, immediately turn off the boiler and bleed radiators to release trapped air, optimising water circulation.

Check the pump for malfunctions, verify the thermostat's accuracy, and reset the boiler. If problems persist, consult your boiler's manual for specific instructions or seek professional assistance to prevent damage and ensure safe, efficient heating.

E119

• Boiler: Generic
• Recommendation: Top up boiler pressure

This error code signifies low water pressure. Add water into the system until the pressure gauge indicates a healthy water level, normally between 1 & 2 bar. If you are having to do this more than once every 2 months or if you can see signs of a leak, call out an engineer.

E133

• Boiler: Generic
• Recommendation: Reset boiler

This error code means the boiler has failed to ignite. Check if there is a gas supply to other appliances (i.e. Hob) and that the gas meter is turned on (and is in credit), then reset the boiler. If there is a rumbling sound or if the error code persists, call an engineer.

E117

• Boiler - Baxi
• Recommendations - requires a Gas Safe registered engineer

The "E117" boiler error code, often seen in Baxi boilers, indicates that the water pressure is too high. To resolve this issue, bleed the radiators to reduce excess pressure. Ensure the boiler is off while doing this. If the pressure remains too high, consult a professional heating engineer to inspect and address any potential problems with the boiler's pressure relief valve or other components.

LC & L2

• Boiler: Ideal
• Recommendation: Reset boiler

These error codes signify an ignition lockout, usually caused by the boiler switching off. If you are on a prepayment meter check whether that has recently run out of credit, or check the settings on your thermostat. In either of these cases, when you have resolved the issue a simple reset of the boiler should see your boiler working again.

F1

• Boiler: Ideal
• Recommendation: Top up boiler pressure

This error code signifies low water pressure. Add water into the system until the pressure gauge indicates a healthy water level, normally between 1 & 2 bar. If you are having to do this more than once every 2 months or if you can see signs of a leak, call out an engineer.

LF

• Boiler: Ideal
• Recommendation: Reset boiler

This error code means the boiler has failed to ignite. Check if there is a gas supply to other appliances (i.e. Hob) and that the gas meter is turned on (and is in credit), then reset the boiler. If there is a rumbling sound or if the LF code persists, call out an engineer.

EA 227

• Boiler: Worcester Bosch
• Recommendation: Reset boiler

These error codes signify an ignition lockout, usually caused by the boiler switching off. If you are on a prepayment meter check whether that has recently run out of credit, or check the settings on your thermostat. In either of these cases, when you have resolved the issue a simple reset of the boiler should see your boiler working again.

E118

• Boiler: Baxi
• Recommendation: Top up boiler pressure

This error code signifies low water pressure. Add water into the system until the pressure gauge indicates a healthy water level, normally between 1 & 2 bar. If you have to do this more than once every 2 months or if you can see signs of a leak, call out an engineer.

E135

• Boiler: Baxi
• Recommendation: Reset boiler

These error codes signify an ignition lockout, usually caused by the boiler switching off. If you are on a prepayment meter check whether that has recently run out of credit, or check the settings on your thermostat. In either of these cases, when you have resolved the issue a simple reset of the boiler should see your boiler working again.

E256

• Boiler: Vaillant
• Recommendations - require a Gas Safe registered engineer.

This error suggests a lack of water circulation. Ensure that the system's pump is functioning correctly and check for blockages in the pipes. To fix the E256 error on a Vaillant boiler, check the circulation pump for issues, clear blockages, bleed radiators, and ensure valves are fully open. Verify system pressure and reset the boiler. If the problem persists, consult a qualified engineer for professional assistance.

F27

• Boiler - Valiant
• Recommendations – requires a Gas Safe registered engineer.

The "F27" boiler error code, commonly seen in Vaillant boilers, points to a problem with the gas supply or ignition. To resolve it, first ensure the gas supply is uninterrupted. If the issue persists, consult a qualified heating engineer to investigate and rectify any issues with gas pressure, ignition components, or the gas valve, ensuring the boiler operates safely and efficiently.

F75

• Boiler - Valiant
• Recommendations -

This often indicates a sensor issue, where the boiler's sensor fails to detect the pump's operation. Your boiler's manual lists all fault codes, assisting engineers in diagnostics and offering users insights for booking repair visits. For specific error resolution, refer to the manual or the manufacturer's website for guidance and practical tips.

E20

• Boiler - (Glow-worm):
• Recommendations - top up water pressure if required

An E20 error typically points to a lack of water pressure. Check the system's pressure gauge and top up the pressure if necessary. To resolve the "E20" boiler error code, indicating low water pressure in a Glow-worm boiler, start by checking the pressure gauge, which should ideally read between 1 to 2 bar. If it's too low, carefully top up the system with water to achieve the correct pressure.

Inspect the system for visible leaks, and if any are found, address them promptly. After ensuring the pressure is within the recommended range and fixing any leaks, reset the boiler to clear the error code. However, if the issue persists or is challenging to resolve, it's advisable to seek the expertise of a qualified heating engineer who can conduct a thorough examination and perform necessary repairs.

F28

Boiler - Worcester Bosch
F28 indicates a lack of communication between the boiler and its main components. You may need to reset the boiler. The "F28" boiler error code, commonly seen in Worcester Bosch boilers, often indicates a communication issue between the boiler and its primary components. To resolve it, try resetting the boiler. If the error persists, contact a qualified heating engineer to diagnose and rectify the problem, ensuring that your boiler operates smoothly and efficiently.

A01

Boiler - Alpha

The "A01" boiler error code, found in Alpha boilers, typically points to an ignition failure. Check for gas supply issues and the condition of the ignition electrodes. First, ensure the gas supply is uninterrupted. Check the condition of the ignition electrodes and clean or replace them if necessary.

If the issue persists, or if there are underlying problems with the gas supply, it's advisable to seek assistance from a qualified heating engineer to ensure the safe and efficient operation of the boiler.

It's important to remember that while these error codes and recommendations can be a helpful starting point for troubleshooting boiler issues, if the problem persists or if you are unsure about any aspect of your boiler's functioning, it's always wise to seek the expertise of a qualified engineer. Regular boiler maintenance and servicing can help prevent many of these issues, ensuring your heating system runs smoothly and efficiently.

l2 on Boiler

• Boiler - Ideal Logic Boiler
• What does L2 mean on a boiler?

The "l2" error code on a boiler typically indicates an ignition failure, meaning the boiler has tried to ignite the burner but was unsuccessful, leading to a system shutdown for safety.

Common Causes:

• Gas Supply Issues: Interrupted or inadequate gas supply.
• Ignition Electrode Fault: Dirty, damaged, or misaligned electrode.
• Flame Detection Problems: Faulty or dirty flame sensor.
• Blocked Flue or Vent: Obstructed airflow affecting combustion.
• Low Gas Pressure: Insufficient gas pressure from the supply line.

To resolve the "l2" error code, you can take several steps. First, check the gas supply to ensure all valves are open and the gas meter is functioning correctly. Next, inspect the ignition electrode for any signs of dirt, damage, or misalignment, and clean or adjust it if necessary. Similarly, clean the flame sensor gently to ensure it can properly detect the flame. Additionally, check the flue and venting system for any obstructions and remove them if needed.

If these steps do not resolve the issue, it is advisable to consult a certified heating engineer who can conduct a thorough inspection and perform any necessary repairs or replacements.

Error code 118 

• Boiler: Ariston 
• Recommendation: Repressurise your boiler to the correct level and then reset it.

Error code 118 in the Ariston boiler signifies a water pressure fault within the boiler system. This typically occurs when the water pressure drops below the necessary operating level, causing the boiler to shut down to prevent damage or inefficiency.

If you encounter error code 118, the first step is to check the pressure gauge on your boiler. Ideal water pressure is usually between 1.0 and 1.5 bar. If the pressure is below this range, you may need to re-pressurise the system. This can often be done by adding water via the filling loop until the pressure gauge indicates a sufficient level. Additionally, it's wise to inspect for any visible leaks in the system that might be causing the pressure drop.

In some cases, error code 118 can be resolved by simply resetting the boiler after addressing the pressure issue. If the problem persists despite taking these steps, it might indicate a more complex issue such as a faulty pressure sensor or a more significant leak, requiring professional assistance. Regular maintenance and monitoring of your boiler’s pressure can help prevent such issues and ensure smooth operation.

Error code 118

• Boiler - Eco-Impact Boiler
  Recommendations - Adjust the water pressure in your boiler to resolve the error.

The eco compact boiler error 118 typically indicates a low water pressure issue within the boiler system. This error is common in many modern boilers and usually means that the water pressure has dropped below the minimum threshold required for the boiler to operate safely. Low water pressure can be caused by various factors, including leaks in the system, recent bleeding of radiators, or issues with the pressure relief valve

Error Code: E25

• Boiler - µþ²¹³æ¾±Ìý
• Recommendations - Reset the boiler for resolution.

Error code Baxi E25 indicates a problem with ignition, often triggered by the boiler shutting down unexpectedly. Check your prepayment meter for credit or thermostat settings. Once resolved, a simple reset of the boiler should restore functionality. If the problem persists this might be due to underlying serious problems your boiler is facing. It might indicate a fault within your boiler. 

Error Code T17

• Boiler - µþ²¹³æ¾±Ìý
• Recommendations - Check sensor connections and reset the boiler.

The Baxi boiler T17 error code indicates a fault related to the heating return sensor. This issue typically arises when the sensor is either short-circuited or disconnected. It can affect the boiler's ability to accurately monitor and manage the temperature of the returning water, potentially leading to inefficient operation or system shutdown.

To resolve this issue, the first step is to attempt a boiler reset, which may clear the error if it's a temporary glitch. If the problem persists, it is advisable to check the connections to the return sensor for any loose or damaged wires. Ensuring the system's water pressure is within the recommended range can also help, as low pressure can sometimes cause related issues.

Error 16 Eca Boilers

• Boiler - ECA Boilers
  Recommendations - Check for leakages and reset the boiler

Error 16 on ECA boilers often signals a fan failure or an issue with the air pressure switch, which prevents the boiler from properly starting. This error indicates that the boiler's fan may not be working properly, or that there is an obstruction in the flue or air intake. These issues may cause the boiler to lock out for safety concerns. Users should first check for any obvious blockages around the flue or air intake, and make sure the boiler is properly ventilated. If no obstructions are discovered, restarting the boiler may temporarily remedy the problem, but it is critical to contact a competent professional to investigate and repair the underlying cause to avoid future occurrences.

Error Code 133

• Boiler - Main Eco Impact
  Recommendations - Ensure there is sufficient gas supply and reset the boiler

Error number 133 on a Main Eco Compact boiler often indicates an ignition failure, which can occur when the boiler fails to ignite or maintain a flame. A clogged flue, a low gas supply, or a problem with the gas valve are all possible causes of this issue. It is critical to first verify the gas supply to ensure it is adequate and continuous. In addition, check the chimney for any obstructions that could be preventing optimum ventilation. After correcting these probable concerns, a simple boiler reset frequently addresses the problem, allowing the system to function normally again.

Error Code 118

Boiler - Potterton
Recommendations Repressurize the system and reset the boiler

The Potterton 118 error code indicates a problem with the heating system, typically related to a loss of water pressure within the boiler. This error can prevent the boiler from functioning correctly and is often accompanied by a drop in performance or complete shutdown. Homeowners should first check the boiler's pressure gauge to ensure it is within the recommended range, usually between 1 and 1.5 bar. If the pressure is too low, the system may need to be repressurized. Additionally, it is essential to inspect the system for any visible leaks or other potential issues that could be causing the pressure drop. Once any underlying problems are resolved, a simple reset of the boiler should restore normal operation.

Also Read -

• Plumbing and Drainage Comparison
• How Do Thermostatic Radiator Valves Work?
• Do You Need a Boiler Cover?
• How to flush a central heating system combi boiler?
• Why is my boiler leaking water
• How to repressurise a boiler 
• How long does it take to fit a boiler?
• How to connect a wireless thermostat to a boiler?