Turn on the heater.Īnother cause for the Hayward pool heater LO failure code appearing on your screen is a water pressure switch fault. Now, run the pump after shutting down the drain outlet valve.Set the lever to FILTER to stop the pump. Slide the lever to the RINSE position, start the pump, and rinse for 15-30 seconds.Rinse for 1 to 2 minutes, or until the fluid in the sight glass is clear. The valve of the return and suction lines need to be open. Switch the lever to the BACKWASH position. Take off the pump’s cover to clear the filter basket. Close the suction and return lines’ valves. In case the elements are too worn out to be reused, replace them and put the filter back together. In case you have a sand filter, follow the instructions below to backwash it. With your garden hose, wash all the dirt and debris you can out of them. Typically, your filter should have 4 elements. To clean your DE filter you need to open it up and take out the elements from the tube. Cleaning a cartridge filter is relatively harder. In my experience, sand filters and DE filters are the most common. Your filter is either a sand filter, DE filter, or cartridge filter. If you get this error code, chances are your heater has nothing wrong with it except a dirty filter which is easily solvable. The number one cause of low water pressure is a dirty and clogged pool filter. We will now take an in-depth look at what causes your heater to display LO error code. But actually, the heater does turn on and gets power but enters a lockout mode that stops the heater from responding. When this occurs you may mistake it as your Hayward pool heater not turning on. So, basically, the LO code means that your heater doesn’t have sufficient water flow. The reason why the limit string opens is a low water flow rate. The LO error code means that the limit string is open. How do I know if my flow switch is bad?.Where is the pressure switch on a Hayward pool heater?.How do you adjust the pressure switch on a Hayward pool heater?.Read our guide on how to fix the LO code on the Hayward heater to get your heater running ASAP. The possible causes behind this error message are- a dirty pool filter, water pressure switch fault, vent pressure switch fault, temperature limit switch fault, and exhaust gas temperature limit fault. If your heater or heat pump is displaying an error code on its display, or the heater does not appear to be On after you have confirmed the breaker is On, you should contact a Hayward Authorized Service Center( HASC ) for help.The Hayward heater LO code is one of the most common Hayward heater error codes.Some of the most common error codes are, IF – ignition failure, LO – A pressure switch problem, and AO – a vacuum switch problem. Usually, the heater will display an error code on its display when sensing a problem. The heater/heat pump is detecting a problem. Inspect the breaker for the heater and make sure it is On. The cable connecting your heater to the Omni controller has been unplugged or damaged..Some other reasons why your heater or heat pump is not working, while displaying a “Heating” status. We will send you instructions on how to place your heater into BO mode. If you would like assistance with placing your heater into BO mode, send an email to In the email, include your Gas heater or Heat pump’s model number, the serial number, and a picture of the heater’s display.If you believe your heater is not in BO mode, check your gas heater or heat pump manual for instructions on how to place your heater into BO mode. Most heaters will display the letters BO on the heaters display to indicate it is in Bypass operation mode.One of the most common reasons why the heater is not running while displaying the status as “Heating”, is because the heater is not in Bypass Operation mode. If the heater status is displaying “Heating” the heater is actively heating.
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