Replacing Circuit Board on MasterBuilt smoker

[dsk]

Either as tallbm indicated the wire connector went bad, or the relay contacts finally went bad, heated up, and the heat conducted to the connected wiring. The blue/white wire order makes no difference as they are just connected together on the board, and also supply power to the transformer used for the electronics.

Good to see MB changed over to switching the hot with the relay, rather than the neutral as was the case in earlier models.

 

[mbk]

Hi there and welcome Mark!

Yeah I see that burnt smooth black wire at the lower circuit board. I couldn't tell if the little plastic box component it plugs into was swollen up and showing burn signs either. If the little plastic box component seems fine then it may be that you can get away with changing the wire connector on that black wire and hooking back up and see if it works.

My hunch is that if the black wire is burnt up then there was looseness with the wire and the connector, or the connector and the black plastic box component. So much so it causes resistance and that causes major heating up. Enough to melt plastic insulation or that little black plastic box component.

If you switch the connector and it all works then you are good to go!
If the circuit board or that black box component on the board itself are burnt up then you will have one hell of a time finding a replacement part. If you are a circuit board hardware kind of guy you might be able to replace that component but I've only seen 1-2 people savvy enough to do so (I'm not one of them lol).

The other option (better option actually) is to do the simple rewire and buy a ready to go PID controller and turn that golf cart of an MES into a Ferrari :D
The PID controller runs like $160 BUT it really is a whole different smoker and one that performs like similar electric smokers with PID controllers but they cost over $1,000!!!

So for $160 and no more effort than you plan to apply already, you can have a smoker that hits and holds dead on with temps and you can keep running through anything short of it being hit by a car lol.

Here is the simple rewire guide for using a PID controller. Simple = cut the ends off 4 wires in your picture and then wire nut to make 2 whole wires. At that point the MES plug will feed power to the heating element keeping the high temp safety switch in the mix while bypassing ALL other stock MES electronics that tend to fail.

MES Rewire Simple Guide - No Back Removal Needed!!!

Lately I've seen a number of posts about guys wanting to rewire their MES. I had wanted to post a quick and simple guide for those out there that are curious or those that simply need to rewire but need a little assistance. Well here goes. Disclaimer: When messing with electrical equipment...

www.smokingmeatforums.com

I hope this info helps and ask all questions you have :D

Thanks, ɓtallbm !
I'll try the burnt wire connector fix this weekend..I'm not ready to turn it into a cold smoker yet,
Mark k

 

[mbk]

Thanks, ɓtallbm !
I'll try the burnt wire connector fix this weekend..I'm not ready to turn it into a cold smoker yet,
Mark k

Well..I tried the burnt wire fix to no avail.

I found a twice used 30" digital masterbuilt on 'market place ' for $140.
It came with a cover, couple pair rubber/silicon gloves, a set of those bear claw looking meat rippers and a magnetic bbq'ing time and temp chart with everything but squirrel and ground hog on it that i put on the garage fridge. That magnetic chart is gonna be a god send as I get older...I fear.
Anyway , btallbm, I appreciate your response and will put my old box up till I decide what I'm gonna do with it.

 

[tallbm]

Well..I tried the burnt wire fix to no avail.

I found a twice used 30" digital masterbuilt on 'market place ' for $140.
It came with a cover, couple pair rubber/silicon gloves, a set of those bear claw looking meat rippers and a magnetic bbq'ing time and temp chart with everything but squirrel and ground hog on it that i put on the garage fridge. That magnetic chart is gonna be a god send as I get older...I fear.
Anyway , btallbm, I appreciate your response and will put my old box up till I decide what I'm gonna do with it.

It seems like that component on the board may have burned up along with the end of your wire.
It is unlikely you will find a replacement circuit board so your option now is to do the simple rewire and use a PID controller. As mentioned already, that will turn your busted MES30 into an amazing whole new animal if/when you are ready.

For now it seems you are going to be up and running :D

Something to consider. Rather than rewire the busted MES30, you might be able to find a free or super cheap MES40 for sale used. Wash it out and do the rewire + PID controller conversion and have a size upgrade in addition to the performance upgrade. Many MES30 guys upgrade to an MES40 when they get the chance, but there are some who stick to the MES30.

Just some food for thought since the PID and rewire cost is the same no matter if it's an MES30 or MES40. I always say the best electric smoker you can get is a free or super cheap busted/used one that you rewire and slap a PID on :D

 

[gayatripr]

I have Masterbuilt 30” Digital electric Smoker. The electric panel was on fire and I need to replacement. I need the connectors referenced. Where supposed to be wiring, I will appreciate

 

[gayatripr]

Does anyone have the diagram for this power circuit?

 

[normanaj]

Does anyone have the diagram for this power circuit?

tallbm may be able to help you out with that.

 

[gayatripr]

Does anyone have the diagram for this power circuit?

How we can handle this situation?

 

[dr k]

Does anyone have the diagram for this power circuit?

It didn't come with a wiring diagram? Did you takes pictures of the old board before disconnecting the wires and removing it? It has two black cube relays so does this Mes 30 have a top broiler heating element? Any inside pictures of the smoker? Take pictures of the back of the smoker model and serial number plate. We can't help you without more pictures and information but MB should have diagrams even if they no longer carry this board. This thread was started July 16, 2021and has three different or so fixes in it and you may want to start a new thread because I had to read the whole thing to make sure I wasn't missing any pictures or information. MB should have the diagram you need.

 

[gayatripr]

It didn't come with a wiring diagram? Did you takes pictures of the old board before disconnecting the wires and removing it? It has two black cube relays so does this Mes 30 have a top broiler heating element? Any inside pictures of the smoker? Take pictures of the back of the smoker model and serial number plate. We can't help you without more pictures and information but MB should have diagrams even if they no longer carry this board. This thread was started July 16, 2021and has three different or so fixes in it and you may want to start a new thread because I had to read the whole thing to make sure I wasn't missing any pictures or information. MB should have the diagram you need.

The old board was burned so I don’t have info to rewired the new one

 

[normanaj]

Here's some wiring diagrams from an internet search:

masterbuilt electric smoker wiring diagrams at DuckDuckGo

DuckDuckGo. Privacy, Simplified.

duckduckgo.com

Probably could be a little more refined by model number but I would think there all pretty much the same?

 

[gayatripr]

tallbm may be able to help you out with that.

Le me know thanks

 

[tallbm]

Does anyone have the diagram for this power circuit?

Hi there and welcome.

I do not have a diagram. Who did you buy it from? Maybe they have a wiring guide.

The board you have has extra connectors and 2 relays like it manages 2 heating elements.
I have an idea on how it should be wired but I don't have facts on how it should be wired and I have never handled one of those circuit boards to see where all the connectors and the circuit board paths are all configured up.

I looked online and could not find any wiring diagrams for the board you had even though I could find a number of them available to buy.

Here is an example of a board that only has 1 relay (black box that says Hongfa on it).

The image above is a circuit board that manages only the main heating element that cooks the food in the MES.
The braided blue wire in the image above goes from this board to one prong of the heating element.
The smooth white wire comes from the plug cord.

The braided red wire goes from this circuit board to the OTHER prong of the heating element.
The smooth black wire comes from the plug cord.
The black box (says Hongfa) is the relay switch which cuts the power on/off to the heating element and is told to cut power on/off by the controller sensing the temp in the smoker and trying to hit and maintain the set temp that was entered into the controller.


Your circuit board has 2 Hongfa relays and an extra prong left of the yellow square box on the board. So again, I have an idea no how this may be wired up but I don't have enough knowledge of your unit (does it have 2 elements? what are the 2 elements?) and I have never directly fooled with one of these boards before.

I hope this info helps get you a little further and maybe someone else with some direct experience can chime in to move things forward.