We have a brand new pool last September. had pool company winterize pool, and open it up this spring. they wouldn't touch the heater as part of the opening which I didn't find out about until after the fact. Told me I could just turn it on as the home owner. Turned heater on, it comes on fine, gas is on, it starts to heat up, you feel the hot exhaust, it runs for between 10 and 20 minutes max, and then the "service heater" light comes on.
Spent the past week trying everything I could think of to get it work. The manual indicates this could be a low flow issue, so I've tried what little I can think of to ensure proper flow. Today I took apart the 3 stage filter entirely, washed out all the filters, washed the sand and silt out of the bottom, etc. to see if that would help, no luck at all.
It's a Pentair MasterTemp Pool and Spa Heater, worked great last year for the 2 months we had it on, not sure if there is any pool opening heater maintenance I've missed along the way? The pool company has called a certified natural gas installer to come and look at it, it's a holiday in Canada this weekend, so won't see him until at least Tuesday if we're lucky, was really hoping to enjoy the pool over the long weekend.
Only other thing that's different this year over last is that the gauge on the filter is showing zero, and it did show pressure last year. The pool guy commented on it (after I pointed it out) and confirmed he didn't think it was working and likely needed to be replaced. When I cleaned the filter and put it back together. I had the release valve open until the water filled the filter and then closed it, so I know there is water in the filter, but wondering if maybe there isn't enough overall pressure in the system, which could explain why the pressure valve is showing zero, and why the heater is giving the "service heater" error, one of the symptoms that can cause this is low flow.
any thoughts on other things I can check, try out, look further in to? let me know, appreciate any insights anyone might have.
Enjoy the weekend,