Worcester A21 Error Code - What is it and How to fix! 

In this video we cover the meaning behind the A21 Error code on your Worcester Bosch thermostat and ways you can fix it yourself.
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Chapters:
0:00 - Introduction
0:12 - Understanding the A21 Error Code
0:21 - Possible Causes and Solutions: Battery and Distance Issues
1:06 - Possible Causes and Solutions: RF Signal Interference
1:25 - Possible Causes and Solutions: Resetting the Thermostat and Boiler
1:55 - When to Call for Professional Help
2:16 - Conclusion and Next Steps

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