Hi guys, sorry you're having heater problems

You may be able to find the 'service dude's ' troubleshooting manual on line (sorry, I don't have one) and follow the tests through the 'ladder'

BB, a new heat exchanger is less expensive than a whole new heater! Look into finding one and I'll give you some help with installing it (also, were you running the pool using "heater eaters" A/K/A a trichlor feeder in the past?)