plumbing london

worcester boiler fault 21

Is your Worcester boiler flashing fault code 21? Don't worry, we've got the solution to get your boiler back up and running in no time!


Are you plagued by the dreaded Worcester boiler fault 21? Don’t let this pesky issue ruin your day! In this article, we’ll dive into some troubleshooting tips to help you get your boiler up and running smoothly again in no time. Say goodbye to cold showers and chilly nights – we’ve got you covered!

Troubleshooting the Pesky Worcester Boiler Fault 21

When your Worcester boiler displays fault code 21, it typically indicates a problem with the flame detection sensor. This sensor is responsible for ensuring that the boiler’s flame is burning correctly. One common issue that can trigger fault 21 is a dirty or faulty sensor. To troubleshoot this problem, try cleaning the sensor with a soft brush or cloth. If cleaning the sensor doesn’t solve the issue, you may need to replace it with a new one.

Another potential cause of Worcester boiler fault 21 is a lack of gas supply to the boiler. Check to make sure that the gas valve is open and that there are no obstructions in the gas line. If you’re still experiencing issues, it’s possible that the gas valve itself may be faulty and in need of replacement. In some cases, faulty wiring or a malfunctioning control board can also trigger fault 21. If you suspect these issues, it’s best to consult a professional heating engineer to diagnose and fix the problem.

If all else fails and you’re still grappling with Worcester boiler fault 21, it may be time to call in the experts. A qualified heating engineer will have the knowledge and expertise to pinpoint the root cause of the issue and implement the necessary repairs. Don’t let a faulty boiler dampen your spirits – with the right help, you’ll have your heating system back in tip-top shape before you know it!

Don’t Let Worcester Boiler Fault 21 Ruin Your Day!

In conclusion, Worcester boiler fault 21 may be a nuisance, but it’s certainly not insurmountable. By following these troubleshooting tips and seeking professional help when needed, you’ll be able to tackle this pesky issue head-on and get your boiler back to its reliable self. Remember, a warm and cozy home is just a few steps away – don’t let fault 21 stand in your way!


So there you have it – a comprehensive guide to troubleshooting the troublesome Worcester boiler fault 21. With a little patience and some handy tips, you’ll soon bid adieu to cold showers and shivers. Keep calm and carry on – before you know it, your boiler will be back to keeping you warm and toasty all winter long.

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