BoilerFaultCodesThe 6 most common faults
01
Block 60 High Engineer
Your boiler’s internal computer has lost its correct settings for how much power it should be using, causing it to stop运行 to prevent damage.
Full guide for Block 6002
Block 80 High Engineer
Your boiler has detected that the exhaust gases are becoming dangerously hot and has shut itself down to prevent internal damage.
Full guide for Block 8003
Block 81 High Engineer
Your boiler has stopped working because it cannot detect a safety component that monitors exhaust fumes, which prevents it from firing up.
Full guide for Block 8104
Block 82 High Engineer
Your boiler has detected an electrical fault in its safety monitoring system and has automatically shut down to keep you safe.
Full guide for Block 8205
Block 85 High Engineer
Your boiler is struggling to detect the water flowing through it, so it has paused operation to run an automatic air-removal process to clear any trapped bubbles.
Full guide for Block 8506
Error 00 High Engineer
Your boiler is failing to light the internal burner correctly, meaning it cannot produce heat or hot water.
Full guide for Error 00on the Atag E Range
Control PCBGas ValveHeat exchangerFlue gas temperature sensorBurner assemblyFlue gas sensor
Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.
Call a Gas Safe engineer if…
- You can smell gas or see signs of a leak
- The Atag shows an Emergency or High severity code
- The boiler keeps locking out after repeated resets
- You've tried the DIY checks and the fault hasn't cleared
- There's visible water leaking from the boiler
- The flame is yellow or orange instead of blue