HAYWARD UNIVERSAL H-SERIES LOW-NOX Error Code
| CONF | DIAGNOSIS | PART MATCH | ACTION |
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90%
CONF
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Water Pressure Switch
The 'LO' code indicates the safety circuit for water flow is open. This switch uses a diaphragm to sense back-pressure from the pump; if the diaphragm ruptures or the internal microswitch fails due to corrosion, the heater cannot confirm water flow and will prevent ignition to protect the heat exchanger.
SKU: FDXLPSW1930
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CHECK PRICE |
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10%
CONF
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High Limit Switch Kit
The 'LO' error path in H-Series circuitry sometimes involves the high-limit thermostats. If these thermal discs trip or lose continuity due to scale buildup on the heat exchanger, they break the safety loop, resulting in a limit-related fault code.
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CHECK PRICE |
DIY Repair Guide
Watch exactly how to replace the Water Pressure Switch.