Smoke hovers over dual stacks but does not puff up (whistle works fine with smoke) I turned all volumes down, and turned smoke on/off. I did not hear the fan motor engage. The engine was running fine just the no smoke just came up. I've had engine since October 2020. I suspect the fan motor is shot or not get voltage to turn on. Is there a way to pull smoke unit out and test voltage and motor resistance? I've replaced smoke units in diesel engines, but never a steam engine.
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Possible causes are: bad fan motor, stuck impeller, broken wire on smoke motor., or possibly a board problem. You’ll need to pull the shell to investigate…..smoke unit is boiler mounted, so not hard to get at…..
Pat
Thanks, Is there a procedure on how to pull the shell ?
I also noticed that while engine is running the amber lights on the outside of the lighted 4014 on top of the boiler are flashing, (not sure if that's diagnostic indicator)
@Doug Bo posted:I also noticed that while engine is running the amber lights on the outside of the lighted 4014 on top of the boiler are flashing, (not sure if that's diagnostic indicator)
That’s not a diagnostic indicator, that’s the 5V being lugged down by increased load. More than likely smoke motor related……
Pat
I managed to get shell off and smoke unit out of boiler. I ohmed out blower motor and it showed resistance. I hooked up a 1.5 volt battery to it and it spun. I'm beginning to think it's not getting voltage to spin. Would that be the circuit board it's plugged into has an issue? If so how do you get a part number for it? ( I checked MTH's web site and that's not easy to find) Any help would be appreciated.
Did some one plug smoke fan into the wrong connector plug? Is the solder joint at molex plug good (under heatshrink). G
The shell has never been off engine until now so the plug is in its original connector (red) As far as the solder joint, you can't see it since there's another board on the underside (both boards are meshed together-probably to save space) I was looking on MTH's web site and I think the board is a boiler board( AE000E32) but is shown as 2 separate boards, the one in my engine is one board( one meshed to the other)
The unit has Whistle steam and normal smoke. The smoke unit """""normally""""" has a red plug to the heat element, and a green plug to the smoke fan. The Markers on white or yellow plug. Again may not be case depending on how they assembled the wire harness.
Are the markers flashing or flickering? Big difference.
As far as boards can either have a single boiler board for both smoke units, or they use a second longer board for the whistle steam. There are no meshed boards like PS-32. They may be co located on a bracket, but clearly 2 separate boards.
The 2020 units seem to be notorious for poorly assembled wiring harnesses.
A Slight tug on the wires to the molex plug that goes to smoke fan may result in a wire coming out of heat shrink due to poor or broken solder joint. If smoke fluid over filled the smoke fan may be saturated and failed.
I would thoroughly examine harness and plugs first. Before I buy a new board. G
Markers are flickering. There is a longer board for whistle smoke, but only 1 boiler board (see attached 
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