How to Fix the Hayward Heater IF Code [SOLVED]

The Hayward heater LO code indicates a fault in the temperature limit switch, vent pressure switch, or water pressure switch. To fix it, ensure the pump is on, is wired and connected well, the water flow is above the required minimum pressure, the filters are clean. Replace defective switches.. The LO code on a Hayward heater means Limit Open, where one of the limit switches is not closing to complete the circuit. To clear the LO code, fix or replace the wiring on the limit switches and any other issues with your heater's limit switch, and you may need to do a backwash to clear out any obstructions.

Are you experiencing a LO code on your Hayward H-Series pool heater? If so, give this video a watch for a few basic tips on how to work through the issue you.. Learn what to check and how to resolve issues when the 'LO' code is displayed on your heater.. Hayward Insights provides expert advice, tips, and industry updates to help pool owners and enthusiasts with their swimming pool experience. Gain insight. Support. Resources. Pool Financing;