Vokera Mynute HE boiler

If your Vokera Mynute HE boiler is locking out intermittently or showing fault codes like A10, A73, or A71, it’s likely caused by a common design issue involving the flue collector and return thermistor.

Let’s break down what’s happening and how it can be fixed.

 Common Issue: Boiler Locking Out or Working Intermittently

If you’re noticing that your Vokera boiler is either:

• Locking out frequently

• Displaying one of the following fault codes:

• A10

• A73

• A71

…then you’re probably dealing with condensation leaks from a cracked flue collector.

 What’s Causing It?

At the top of the heat exchanger in this boiler, there’s a green plastic flue collector. This push-fit part connects to the heat exchanger and routes to the flue system.

Over time, these flue collectors can develop cracks. When they do:

• Condensation starts to drip from the collector.

• These drips fall directly onto the return thermistor located just below.

• As a result, the thermistor gives off false readings, leading to intermittent operation or full lockout.

 The Fix

To fully resolve the issue:

• Replace the flue collector with a new unit.

• Replace the return thermistor, which may have already been damaged due to prolonged exposure to moisture.

This is a common repair that our engineers handle regularly, especially during colder months when condensation issues are more likely.

 Why Use Certificates4UK Ltd?

We’re specialists in diagnosing and repairing all major boiler brands, including Vokera, across Surrey and London. With over 17 years of experience, our engineers know the quickest and most cost-effective ways to get your heating back up and running.

 Gas Safe Registered

 Fast Diagnosis and Repair

 Honest Service — No Pushy Sales

 How to Book

Booking is easy — just choose the method that suits you:

•  Online: 

•  Call: 07869 520044 or +44 7596 076700

•  Email: info@certificates4uk.co.uk or certificates4uk@gmail.com

 Questions? Need a Quote?

We’re happy to help!

No hard sales — just honest advice and reliable service. Let us know what you need, and we’ll guide you every step of the way.

Eliza Żmuda Digital & Operations Manager

Digital & Operations Manager at Certificates4UK. Responsible for website management, digital marketing, customer enquiries, and booking coordination.

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