Mr. Heater Tech Help..Again

[Blade]

Well I got my NEW transformer, put it in and still no green LED light. I guess this has to be the board now? This unit is brand new and doesn't work..I will call Mr. Heater Monday..I have a black wire going to the transformer and one going to the board, I have them both hooked up to the Lead, HOT, is this right. Then the other 3 white wires going to the white or return, common. I have no 24 volts on the R & W screws on the board. Any help would be great..I am not becoming a Mr. Heater fan.....Blade...Big Maxx 75

 

[Junkman]

When I got my Mr. Heater, I also had problems, and they sent me a replacement board, since mine was cracked in shipping. Make sure that you have it properly hooked up, and that the grounds are good, if there are any. If it still doesn't work, then tell them to send you one of everything that it might need to be replaced, or to send you a replacement heater. They will send the parts. Like anything mechanical, you can get one out of the box that is a problem. I was at a friends place today, and they were assembling snow blowers. Everyone that they opened the box, needed some adjustment after it was assembled. Same for the chain saws. That is one reason buy local and to have it installed professionally. It then becomes their headache.

 

[fireman]

Sounds like you have it wired correctly Black = load, White = neutral. My first question would be: Did you turn the power back on after replacing the transformer? If so, check for voltage into the transformer, then out of the transformer. If that checks out, it's the circuit board. The way the boxes are treated by United Package Smashers, it's amazing they arrive at all. Fortuantely, mine arrived fine and has worked flawlessly for 2 years.

 

[Blade]

My question would be why is there black, Hot into the transformer which then goes to the board by a blue and also a yellow wire and then there is another black, Hot wire that goes directly to the board from the direct hot wire... Why is this?... I would think you wouldn't have two 120 hot to the board.

 

[fireman]

I would think you wouldn't have two 120 hot to the board.

You don't. The blue wire from the transformer is 24 volts. Your ignitor,safety switches and thermostat all run on the 24V circuit. The 120V wire that goes to the circuit board and supplies power for the combustion air blower and the fan motor which.

 

[Blade]

Thanks, that helps....

 

[larry4406]

Unrelated but maybe useful. I had a Power Vent hot water heater that would not fire up. LED trouble lights always came up and couldn't figure it out. Turns out electrician had the neutral and black backwards on the outlet and the controller for the water heater sensed the backwards polarity and stopped. Corrected the plug wiring and worked fine.