Baxi Boiler E20 Fault Code Explained

When your Baxi boiler shows an E20 fault code, it's telling you there's an issue with your central heating temperature sensor. This sensor, attached to your boiler's flow pipe, monitors temperature to prevent overheating or underheating problems. While it could be caused by low water pressure or electrical issues, the most common culprit is a faulty temperature sensor or NTC thermistor. You can try a quick reset by turning the selector switch to "R" for 5 seconds, but if that doesn't work, you'll need a Gas Safe registered engineer to diagnose and fix the problem. Let's explore what else might be triggering this error on your system.

Key Takeaways

• E20 fault code indicates a problem with the central heating NTC thermometer, which monitors temperature in the boiler's flow pipe.
• The fault usually occurs due to faulty temperature sensors, disconnected wiring, or failed NTC thermistor resistance readings.
• Initial troubleshooting involves resetting the boiler by turning the selector switch to "R" position for 5 seconds.
• If reset fails, a Gas Safe registered engineer should inspect the system using specialised equipment to check sensor resistance.
• Regular maintenance can prevent E20 faults and ensures efficient operation while maintaining crucial safety features of the boiler.

What Does The E20 Fault Code On A Baxi Boiler Mean?

When your Baxi boiler displays an E20 fault code, it's signalling a problem with the central heating NTC (Negative Temperature Coefficient) thermometer.

You'll find this important NTC sensor attached to your boiler's flow pipe, where it works hard to keep your heating system running safely and efficiently.

Think of your NTC sensor as a watchful guardian – it's constantly monitoring your water temperature to prevent any overheating or underheating issues.

When something's not quite right with this sensor, your boiler will automatically shut down as a safety measure.

It's just like how your car's check engine light warns you before bigger problems develop.

While it might be frustrating to lose your heating temporarily, this boiler safety feature is actually protecting your system from potential damage.

What Causes The E20 Fault Code?

Looking beneath the surface, several key issues can trigger the E20 fault code on your Baxi boiler. Let's break down these common culprits that might be causing trouble in your home's heating system.

Component	Problem	Impact
Temperature Sensor	Faulty or disconnected	Incorrect readings
Water System	Low pressure or blockages	Poor flow
NTC Thermistor	Failed resistance readings	Temperature confusion
Electrical System	Loose wiring connections	System malfunction

You'll often find that temperature sensor issues are the most common cause, where either the primary sensor or NTC thermistor isn't working correctly. Electrical faults, like loose connections or damaged wiring, can also throw your boiler into confusion. Sometimes, it's as simple as low water pressure or a blockage in your system's pipework causing the E20 code to appear.

How Do You Fix The E20 Error Code On A Baxi Boiler?

After identifying what's causing your Baxi boiler's E20 fault code, you'll want to take specific steps to resolve the issue.

As your local boiler maintenance experts, we recommend starting with a simple reset – just turn the selector switch to "R" and hold it for 5 seconds.

If that doesn't do the trick, don't worry! While sensor troubleshooting might seem tempting, it's best to leave this one to the professionals.

Since the E20 code often indicates a faulty NTC thermistor, you'll need a Gas Safe registered engineer to properly diagnose and fix the problem.

We'll use specialised equipment to check the sensor's resistance and replace it if necessary.

Get Your Baxi Boiler E20 Problem Repaired By A Professional

Don't let a faulty boiler disrupt your comfort.

Our Gas Safe registered engineers are ready to diagnose and repair your Baxi boiler's E20 fault quickly and professionally.

Book your repair appointment now through our simple online booking system – schedule your engineer visit today.

Same-day appointments are often available for emergency situations.