What does the Lo code on a hot water heater mean?

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Service Light On: LO Code LO Code:“Limit Open” Verify pump is running and adequate water is flowing through heater. LO Code is normal when the pump is turned off. Step 1: Inspect Water Pressure Switch wiring and ensure Wire Harness terminals are securely fastened to the spade terminals on the Water Pressure Switch. Step 2: Step 3:

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