I have the same problem. Heater power goes on and it reads temp 126. I can adjust setting up or down. There is no service lights on, it just will not start.
If you have your book on this you can look for your thermistor or temp sensor. On your unit this is a piece that screws into the water header and has two wires coming from it. I beleve that the wires unplug from the unit but you may have to follow them back to the board. Make sure that all your power is off when you do this as it will open the system up and if it comes on everything will get wet. The temp sensor is just reading to high and the heater won't call for heat. Once this is replaced this should solv your problem. Good luck.
Part of the ignition system is bad. It is probably the ignitor, if you change it shut main gas supply to unit. Also, shut the power to the heater and turn it back on after repair
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