First time posting here, but I've benefited from other postings on several occasions. I have two questions:
1) The heat exchanger on my grandmother's heater must've corroded over the winter and was leaking pretty bad. It was ten years old, so pool pro recommended replacing the whole heater. He wasn't going to have time til early June to install the new one, so I did it myself. Hooked everything up without a problem, but when the heater went to fire (it's a Hayward H250) the LO error code displayed. I knew this meant inadequate water flow from the previous unit. Looked a few things up and discovered the old heater wanted a minimum of 20 GPM, new one wants a minimum of 25 GPM. The manual mentions that the water pressure switch has an adjustment to allow for variations in altitude. I loosened the adjustment a bit, and now the heater fires just fine. My question - is making this adjustment going to hurt the heater at all? And if so, what alternate solution could I use?
2) My sister has a Sta-Rite SR333NA heater for her pool. Last year I had to replace the blower as some mice took up residence in there over the winter. Same thing happened this year (with the mice), but having a different problem. Heater turns on, blower starts, then Service Heater LED lights as well as AFS LED on the control board. Ordered a new air flow switch, but it won't be in til next week some time. To be sure that is the only problem, I jumpered the two wires attached to the air flow switch together. When I did that, the heater turns on, Heating LED blinks for about ten seconds, (blower does not start at all), then Service Heater LED lights. No LED's on the control board are lit, and the LED on the ICM blinks three times. I replaced the control board - it arrived very quickly thanks to Amazon Prime - but the same thing happens. I did some research and had my brother-in-law test the voltage on the ICM, he said it checked out fine. (he isn't terribly handy, so I might re-test the voltage to be sure) Any ideas what the problem could be? Again, pool pro is coming to check it out, but he's already booked through early June and I'd really like to get this fixed ASAP.
Thanks for any advice!