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Well, the electrician came out this morning and everything checked out. Water pressure switch, temperature limit switch, vent pressure switch and vacuum switch all seemed to be ok. We let it try to cycle through startup multiple times. One cycle (out of about 20) the heater almost fired. Not...

I just opened the vent and used a shop vac to clean out. Mostly just dead insects. I also got the shop vac into every place I could. Definitely some mouse droppings around the heater. I will have the electrician check for continuity on the pressure switch next.

Thank you, Paul! The heater is an H150. It is installed inside a pool shed and is vented through the roof.

Thanks for suggesting this. I just switched out the pressure switch, but the new one did not fix the problem, so I think I can rule out that device. The pressure gauge that I switched is the one on the top of the water filter. It wasn't zero'ing out when the pump was off, so I thought maybe...

Hi all, Novice repair person here. My Hayward spa heater (installed 2018) is not heating the water and is displaying this LO code. I have read every troubleshooting guide and watched every video I could find. My diagnostics included: 1. Cleaned the filters, even ran the pump without the...

Hi, I am hoping that someone may have a solution to this problem. I have a wired connection, model HLBASE, and my firmware needs updating. I have never updated the firmware, so I am a few versions behind. I have followed all steps on this forum and on the Hayward website. My problem is that...