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Hello, click here for the manual please
Turn on 3 hot taps and the shower set to hot all at once, tell me if you can get the water heater to fire.
(thats an indirect test for hard water scale build up in the heat exchanger)
We can go from there
Thanks, ***** ***** case the thermostat most likely needs to be replaced...you can get the exact same model from http://www.shortyshvac.com
Then you can install it wire for wire yourself... be sure to unplug or turn off the power to you furnace first.
Please rate my work, in exchange I will hold the question open for any follow up that you might require
So far it sounds like the heat exchanger needs to be cleaned with white vinegar, have you done that before....here is a video on another brand but it shows you what is involved, click here.
I have a dentist appointment now, I will follow up with you in a few hours when I get back.