Applicable Systems
Lochinvar Knight Boiler (SMART SYSTEM Control)
Symptoms
The boiler reports an induced draft fan fault. The combustion air induction fan is not operating.
Possible Causes
- Fan motor burned out
- Fan blade damaged or obstructed
- Air pressure switch not proving fan operation
Troubleshooting Steps
- Step 1: Test the fan motor operation
Motor runs at full speed - Step 2: Inspect fan blades for damage
Blades are intact and clear - Step 3: Verify the air pressure switch operation
Switch proves fan operation
How to Reset
To reset: Repair or replace the fan, then clear the alarm.
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Source: Lochinvar Boiler Manual, Lochinvar Corporation
Category: Boiler
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