
How to Reset a 'BLOCK' code
, 7 min reading time
, 7 min reading time
Seeing a ‘BLOCK’ error on your WES E-Compact, Trianco Greenflame, Bioflame, or Greenflame boiler? Learn what it means, how to read the code, and how to reset it safely.
If your boiler is displaying ‘BLOCK’, it does not mean there is a physical blockage. Instead, it indicates that the boiler has entered an error state and has shut down as a safety measure.
To the right of the ‘BLOCK’ message, you will see an error code (e.g., Er12). This code is crucial in diagnosing the issue. Below is a comprehensive guide to these error codes, their meanings, and how to resolve them.
You should always speak with your manufacturer-approved service engineer before making any changes or remedying issues with your boiler. If in doubt, please call us on 01772 284 626
How to Read & Reset ‘BLOCK’ Errors
📌 First, identify the error code displayed next to ‘BLOCK’.
📌 Follow the steps below to troubleshoot and clear the issue.
📌 To reset an error, press and hold the power on/off button for three seconds unless otherwise stated.
Er01& Er04 – Water Safety Thermostat Activated
✅ Issue: Overheating detected by the safety thermostat.
Er05 – Exhaust Over-Temperature
✅ Issue: The exhaust gases are too hot, which could indicate airflow issues.
🔧 Fix:
Er09 – Low Water Pressure
✅ Issue: The system is detecting insufficient pressure.
🔧 Fix:
Er10 – High Water Pressure
✅ Issue: The system pressure is too high.
🔧 Fix:
Er12 – Failed Ignition
✅ Issue: The boiler failed to ignite properly.
🔧 Fix:
Er13 – Accidental Extinguishing (Low Exhaust Temperature)
✅ Issue: The boiler flame went out due to low exhaust temperature.
🔧 Fix:
Er15 – Loss of Voltage (Power Cut)
✅ Issue: The boiler often detected a loss of power after a power cut.
🔧 Fix:
Er18 – Lack of Pellets
✅ Issue: The pellet sensor detected a lack of fuel in the hopper.
🔧 Fix:
Er34 – Low Vacuum Pressure
✅ Issue: The system is detecting insufficient vacuum pressure.
🔧 Fix:
🚨 If an error persists after troubleshooting, it may require expert diagnosis. Contact a professional engineer to inspect and repair your boiler.
🔧 Need Professional Help?
📞 Book a boiler engineer
Key Takeaways
✔️ ‘BLOCK’ does not mean a physical blockage, but an error state.
✔️ The error code next to ‘BLOCK’ tells you what’s wrong.
✔️ Check for fuel supply, pressure issues, and overheating causes before restarting.
✔️ Persistent errors may require new parts or professional servicing.
Need Spare Parts?
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🚀 Need an Expert Engineer?
🔧 Book a service with Tisigo
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