Common Boiler Error Codes

Key Takeaways

Boiler error codes communicate specific issues which helps aiding in troubleshooting.
Low water pressure, ignition failures, and water circulation problems are common issues found within boilers.
Different brands like Worcester Bosch, Baxi, Vaillant, Viessmann, and Ideal have unique error codes indicating various problems.
Complex issues, especially with gas components, require a certified technician for safe and effective resolution.
- If you’re in Bedford, Milton Keynes, or Cambridgeshire, we are GAS registered technicians and can help replace & upgrade your boiler.

Ever seen those cryptic codes flashing on your boiler and wondered what they mean? They’re error codes, and they’re crucial for figuring out what’s wrong with your heating system.

What Does a Boiler Fault Code Mean?

Boiler fault codes are like a secret language your boiler uses to communicate specific issues. Knowing what they mean helps in troubleshooting.

Think of a boiler fault code as a quick way for your boiler to communicate with you. Each code is unique and pinpoints a specific issue, making it easier to address the problem efficiently.

The Most Common Boiler Error Codes

When it comes to boilers, a few issues pop up more often than others. These common faults are usually indicated by specific error codes, and knowing them can help you understand the condition of your boiler better.

Low Water Pressure (E.g., E118 for Baxi, F1 for Ideal)

A classic issue in many boilers, low water pressure can cause your heating system to underperform or even shut down. It’s often indicated by a specific error code and usually requires repressurising the system.

Ignition Failures (E.g., EA for Worcester Bosch, E133 for Baxi)

If your boiler fails to ignite, it can leave you without heating or hot water. This could be due to a range of issues, from electrical faults to problems with the gas supply.

Water Circulation Problems (E.g., E256 in Vaillant)

If water isn’t circulating properly in your boiler, it could be due to a pump issue or blockages in the system. This can lead to uneven heating or no heating.

white boiler on the wall with copper piping

Brand Specific Boiler Error Codes

Worcester Bosch Error Codes

EA: Ignition failures or flame issues
E9: Heat exchanger overheating
F28: Communication issues
C6: Boiler running too fast or slow
D1: Sensor wet or damaged

Baxi Error Codes

E117: High water pressure
E118: Low water pressure
E135: Ignition lockout
E133: Ignition failure
E28: Sensor troubles

Vaillant Fault Codes

F27: Gas supply or ignition problems
F75: Sensor failure in detecting the pump
E256: Lack of water circulation
F28: Ignition problems
F62: Gas valve delays

Viessmann Boiler Error Codes

5C, 5D, 5E, 5F: Control mode communication faults
10: Outdoor temperature sensor short-circuited
18 and D1: Outdoor temperature sensor cable broken
A4: Burner blocked, issues in the internal circulation pump
20: Supply temperature sensor problem

Ideal Boiler Fault Codes

F1: Low water pressure
LF: Boiler failed to ignite
LC & L2: Ignition lockout
F2: Flame detection problems
F4: Temperature sensor issues

Signs you need a new boiler

When to Call a Professional

While some issues can be addressed by re-pressurising the system or resetting the boiler, more complex problems, especially those involving gas components, require the attention of a certified technician. PJH Co. provides an expert service to effectively diagnose and repair such issues.

PJH Co. is your go-to expert for resolving boiler errors, ensuring a smooth and efficient heating system. We decode these error codes and fix the issue effectively, bringing warmth back to your home.

Contact us today to book a service.