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Dayton 3UH62 furnace house blower not working.
Blower motor was going out on our furnace, ordered a matching Protech motor as a replacement along with a new run capacitor. Finished it up last night and went to test it. Exhaust blower kicks on then the burners light. The house blower never kicks on, which I assume triggers a high temp limit shutting the burners off. The green OK light on the board is flashing in a three blink pattern, I am assuming this is a fault code for a temp limit but cannot find the definitions for the codes. Any ideas on A reason the new motor is not turning on?
Thanks Eric.
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Comments
The board has a timer to start fan after a call for heat.
But first:
Are you sure of the motor connections on the board?
Probably a white common which must be OK if motor runs now.
3 or 4 speeds......you would use 2 (heat & cool)....
the other 1 or 2 would park on unused leads/speeds.
(The cap leads are probably brown and obvious connections)
If that is all right then you may have a bad fan control board.
Remove all the fan motor wires from the board so all the writing may be seen. Picture of that please, I am not familiar with that board so I need help.
Also a picture of the wiring diagram that shows the board connections.
Thanks
We can't see the designation on the board.
If a motor lead is connected to the heat terminal on the board and the fan doesn't run, it's probably a bad relay in the board, OR, is there another control mounted below the board with some wires and a dial?
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
Most older Rheem furnaces have a seperate TDR for heat.
The best explanation I could offer is that the old motor was overheating the heat relay as the motor stalled and drew locked rotor current until the motor overload opened.
This heat damage may be visible on the back side of the board where the relay is soldered onto the PCB.
Nest question for Wallies: can you run the fan constantly in the heat mode if using a Nest Tstat and conventional furnace??
> Is the time delay relay in the board, or mounted below the board?
> Most older Rheem furnaces have a seperate TDR for heat.
>
Here is a picture of everything.
Not sure why my picture ended up in the next comment down?
> It is frustrating for repair people to find one problem and suddenly there are two bad parts.
> The best explanation I could offer is that the old motor was overheating the heat relay as the motor stalled and drew locked rotor current until the motor overload opened.
> This heat damage may be visible on the back side of the board where the relay is soldered onto the PCB.
>
> Nest question for Wallies: can you run the fan constantly in the heat mode if using a Nest Tstat and conventional furnace??
I’ll pull the board off and have a look at the back
Congratulations
There should be a Rheem distributor in your area.
Or Ruud. They're pretty much the same. Just give the model and serial numbers so they can cross reference.
Good job!