If your Baxi boiler is displaying the E168 error code, it usually means the boiler has detected a fault but cannot identify a specific cause. Unlike many boiler fault codes that point to one particular issue, E168 is a general fault code that often appears when there is a problem with the boiler’s electronics, power supply, or internal components.
This guide explains what the Baxi E168 error code means, the most common causes, how to troubleshoot the issue, and when to contact a qualified heating engineer.
Estimated reading time: 5 minutes
What Does the Baxi E168 Error Code Mean?
The Baxi E168 error code is a generic fault warning. It indicates that the boiler has detected an issue somewhere within the system but cannot assign it to a specific fault code.
In many cases, E168 appears after another fault has occurred and been reset. The boiler may lose track of the original fault and display E168 instead.
Because this error can have several causes, a proper diagnosis is often required to identify the underlying problem.
Common Causes of a Baxi E168 Error Code
Several faults can trigger the E168 error code.
1. Previous Boiler Faults
In some cases, the Baxi E168 error code appears after another fault code has been cleared. This happens when the boiler detects a previous issue but is unable to identify the exact fault after a reset.
Common fault codes that may appear before E168 include:
E119 – Low water pressure
E125 – Circulation fault or overheating issue
E133 – Ignition failure
E20 – Temperature sensor fault
If your boiler displayed another fault code before showing E168, resolving the original problem may also clear the E168 error.
2. Power Supply Problems
Baxi boilers require a stable electrical supply to operate correctly.
Voltage fluctuations, power interruptions, or wiring problems can trigger the E168 fault code. These issues may occur intermittently, making them difficult to identify without specialist testing equipment.
3. Faulty Boiler Components
Several internal components can cause E168 if they fail or operate incorrectly.
Common examples include:
- Gas valve
- Fan assembly
- Pump
- Ignition electrodes
- Wiring harness
- Diverter valve
A faulty component may prevent the boiler from operating correctly and trigger the fault code.
4. PCB Failure
The Printed Circuit Board (PCB) is the control centre of the boiler.
If the PCB develops a fault, it may send incorrect signals to other components and generate an E168 error code. PCB issues usually require professional diagnosis and replacement.
Symptoms of a Baxi E168 Fault
Alongside the E168 code, you may notice:
- Boiler lockout
- No heating
- No hot water
- Intermittent operation
- Unexpected shutdowns
- Other fault codes appearing before E168
These symptoms can vary depending on the underlying cause.
How to Fix a Baxi E168 Error Code
Time needed:Â 1 minute.
- Step 1: Check for Previous Fault Codes
If your boiler displayed another fault code before showing E168, investigate the original error first. The E168 fault is often linked to an earlier issue that has not been fully resolved.
- Step 2: Reset the Boiler
Try resetting the boiler using the manufacturer’s instructions. A simple reset may clear a temporary fault caused by a power interruption or system glitch.
Avoid repeatedly resetting the boiler if the error continues to return. - Step 3: Check the Power Supply
Ensure the boiler has a stable electrical supply. Check for tripped breakers, loose connections, or recent power cuts that may have affected the boiler.
If you suspect voltage problems, contact a qualified electrician. - Step 4: Arrange a Professional Inspection
If the fault persists, a qualified heating engineer should inspect the boiler. Professional testing can identify faulty components, wiring issues, or PCB failures that may be causing the E168 error.
When Should You Call a Heating Engineer?
You should contact a qualified engineer if:
- The E168 fault returns after resetting
- The boiler repeatedly shuts down
- Heating and hot water are unavailable
- Other fault codes continue to appear
- You suspect an internal component failure
Because E168 can involve electrical and gas-related components, professional diagnosis is strongly recommended.
Does E168 Mean You Need a New Boiler?
Not necessarily.
Many E168 faults are caused by repairable issues such as faulty sensors, wiring faults, or power supply problems. However, if the boiler is older and requires major component replacements, it may be worth considering the cost of repair versus replacement.
A heating engineer can advise on the most cost-effective solution.
Can Annual Servicing Help Prevent E168 Faults?
Regular boiler servicing can help identify worn components before they fail.
During an annual service, an engineer can:
- Inspect electrical connections
- Check boiler controls
- Test safety devices
- Identify early signs of component failure
Routine maintenance helps improve reliability and reduce the risk of unexpected breakdowns.
Conclusion
The Baxi E168 error code is a general fault warning that can be caused by previous error codes, electrical supply problems, faulty components, or PCB issues. While a simple reset may occasionally resolve the problem, recurring E168 faults usually require professional diagnosis.
If the fault persists, contact a qualified heating engineer to identify and repair the underlying cause before it leads to further boiler problems.
FAQ’s
The E168 error code is a general boiler fault that indicates the system has detected a problem but cannot identify a specific cause.
Yes. You can try resetting the boiler once. If the fault returns, further investigation is required.
Common causes include previous fault codes, unstable power supplies, faulty boiler components, damaged wiring, or PCB failures.
The fault itself is a warning code. However, because it can involve electrical or gas-related components, it should be diagnosed by a qualified engineer.
No. Many E168 faults can be repaired. Boiler replacement is usually only considered if the appliance is old or repair costs are uneconomical.
