Applicable Systems
Greenstar GB162
Symptoms
The boiler reports a fan fault. The combustion air fan is not operating correctly.
Possible Causes
- Fan motor burned out
- Fan blade damaged or obstructed
- Fan speed sensor fault or air pressure switch failure
Troubleshooting Steps
- Step 1: Test the fan motor for operation
Motor runs at the correct speed - Step 2: Inspect the fan blade for damage or obstruction
Blades are clean and intact - Step 3: Verify the air pressure switch operation
Switch detects fan operation correctly
How to Reset
To reset: Repair or replace the fan, then clear the alarm.
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Source: Worcester Bosch Boiler Manual, Worcester Bosch Group
Category: Home Boiler
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