Applicable Systems
Greenstar GB162
Symptoms
The boiler reports a flue blockage. The flue gas path is restricted or blocked.
Possible Causes
- Flue terminal blocked externally
- Flue liner damaged or collapsed
- Flue pressure sensing tube blocked or leaking
Troubleshooting Steps
- Step 1: Inspect the flue terminal for external blockage
Terminal is clear - Step 2: Check the flue liner for damage
Liner is intact and clear - Step 3: Verify the flue pressure sensing tube
Tube is clear and not leaking
How to Reset
To reset: Clear the flue blockage, then reset the boiler.
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Source: Worcester Bosch Boiler Manual, Worcester Bosch Group
Category: Home Boiler
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