ddeem Posted May 20, 2016 Report Share Posted May 20, 2016 I have a Hayward H250 Natural gas heater and I just replaced the bypass assembly to the newer model as the old one broke. I am now getting the LO code. * Filter is Clean * I have let the pump run for 2-3 minutes to reset the heater ** Only concern is maybe the red and blue wire going to the back of the water pressure switch. I can not find a picture. The heater worked before installing the new bypass kit but it would ping and make loud noises due to the broken bypass part. Any help would be great Daniel Quote Link to comment Share on other sites More sharing options...
Bugman1400 Posted May 24, 2016 Report Share Posted May 24, 2016 In addition to the pressure switch, there is also the HI Limit switches that are on that same housing. Check to see that you didn't pull a wire off or one of the switch terminals. Quote Link to comment Share on other sites More sharing options...
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