Everything else seems to be working fine but my heater. It fires up and is running - I can hear the gas running through the lines from in the house and the exhaust from the heater is hot - all the typical telltale signs. But the water isn't heated at all.
There is water through the heater - there's no external bypass. The manual has troubleshooting for it won't fire - but it fires! So i'm really scratching my head.
Anyone have any suggestions on this?