Applicable Systems
Lochinvar Knight Boiler (SMART SYSTEM Control)
Symptoms
The boiler reports a fill valve fault. The automatic fill or makeup water valve is not operating.
Possible Causes
- Fill valve solenoid coil failure
- Valve seat contaminated or worn
- Fill valve pressure regulator misadjusted
Troubleshooting Steps
- Step 1: Test the fill valve solenoid coil
Coil shows correct resistance - Step 2: Inspect the valve seat
Seat is clean and seals correctly - Step 3: Verify the pressure regulator setting
Setting maintains correct system pressure
How to Reset
To reset: Repair or replace the fill valve, then clear the alarm.
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Source: Lochinvar Boiler Manual, Lochinvar Corporation
Category: Boiler
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