My old control board in my Mr. Heater Big Maxx (MHU45NG) had a problem, and one of the connectors and terminals fried. I just put that control board in about a year ago. So, after replacing it again, and reconnecting everything, It is not lighting. It doesn't show any call for heat, but also isn't showing any errors. The fan will run if the thermostat is turned up, but the gas and ignitor never come on. Any ideas?
SOURCE: Blower runs, Ignitor glows, no 24V at gas valve, no click....
Check the two wires coming directly off the transformer. They will be connected to the board the line voltage will be black and white and the 24voltage will be something like blue and red undo from board and check to see if you have 24 volts there. If not your transformer is bad 10 dollar part. Take it to Heating and Air parts house to replace. Let me know ken
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