What It Means
Air Flow Switch Open
Likely Causes
- Blocked combustion air inlet screen
- Inducer motor failed or not spinning
- Air flow switch itself has failed
Next Checks
- Inspect and clear combustion air inlet — remove any debris or insect nests
- Pull inducer compartment cover and listen for inducer motor — it should be audible during startup
- Check AFS pressure tubing for kinks or disconnection
- Test AFS switch continuity — should close when inducer runs
Verify Before Repair
SplashLens is a field reference, not a repair guarantee. Confirm the visible code, exact model, and current manufacturer procedure before replacing parts, bypassing safeties, or quoting a customer.
SplashLens is independent and is not affiliated with Sta-Rite or other equipment manufacturers.
Use SplashLens At The Pad
Manual error-code lookup works after the app has loaded once. AI scan features require internet and should be treated as a second set of eyes.