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GDT635HSM0SS GE Dishwasher with not light on upper control

Nomar06

Premium Member
Joined
Apr 25, 2022
Messages
9
Location
Charlotte
Model Number
GDT635HSM0SS
Brand
GE
Age
1-5 years
Hoping to get some help on my dishwasher issues.

Originally the dishwasher would turn on and work as properly when it wanted to. After a week or two of it working whenever it wanted it finally quit working for a few days straight. No lights on the upper controls and not tripping breaker.

Called a repair guy and he diagnosed and said I had to replace the lower control board and possibly the upper control board. He couldn’t get the boards until possibly June so cancelled the work.

I started my online research and pulled the lower board and saw the led constantly blinking fast.

I bought the lower board WD21X25733 and replaced it. Same issue….no lights on upper controls and no operation. Led on new lower board had the same constantly blinking fast.

I bought the upper control WD21X25724 board and it came in today. I replaced it and still no operation, no light on upper control and same led blinking fast on lower board.


Any help would be appreciated!

Something random….I saw a separate blinking green led at the back of the dishwasher, on the bottom. It is towards the back of the machine. Basically behind the water inlet but towards the back. That led blinks slowly and eventually turns itself off. No idea what that is and doesn’t show up in the manuals.
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
130,200
Location
Redmond, Oregon
Hi, Those are the correct UI board and machine control board for your model.

I posted the service manual in post #6 here:
Then look at post #11
The manual says on page 48--->UI Diagnostics
No display or LED's will light(excluding model GDF510).
1. Check for 120 Volts AC entering the main control.
If no volts are found, check the home breaker.
2. Attempt to enter Consumer Error Mode. If LED's light, the CSM is tripped. Consult On the Main Control Board CSM section of this service guide to diagnose and repair.
3. Check the door harness connections.

If you still can't resolve it, You will need to have a authorized GE come out at 1-800-432-2737 to see what's going on. Only authorized GE techs have a diagnostic device that plugs into the machine control board to see the REAL problem.

Jake
 

Forko

Premium Member
Joined
Mar 25, 2022
Messages
22
Location
California
Let me know if you find anything thing out, I’m waiting for my 3rd replacement UI board and having the same issue.
 

Nomar06

Premium Member
Joined
Apr 25, 2022
Messages
9
Location
Charlotte
Bought a multimeter and started probing away. Main power to the lower board ok, power to the door latch ok, door latch has its own little board and seems to work ok, power seems to get to the upper control board but still nothing lights up when I plug it it…..and this is the new upper board.

Not sure what else to do other than call a GE Tech(which I don’t think the wife wants to wait anymore, been almost 3 weeks now) or go buy a new unit.
 

Nomar06

Premium Member
Joined
Apr 25, 2022
Messages
9
Location
Charlotte
Is there any correlation from the door latch to the upper control board?

Say the door latch is bad, would it cause the upper control board not to have anything light up on it?

I’m guessing no but just grasping at straws now, lol
 

Forko

Premium Member
Joined
Mar 25, 2022
Messages
22
Location
California
I hot swapped the boards and when the old one works the new one doesn’t. I plug in the old one and it works. Weird!. The new one does not.
 

Nomar06

Premium Member
Joined
Apr 25, 2022
Messages
9
Location
Charlotte
Well, I put all the original parts all back and put back every single nut and screw back.

Currently running a wash cycle. No idea why it started working again.

Maybe being unplugged for about an hour reset something???? No clue.
 

Forko

Premium Member
Joined
Mar 25, 2022
Messages
22
Location
California
Mine would work for about 8 hours (powered on time) and die again. Hopefully yours works!
 

Nomar06

Premium Member
Joined
Apr 25, 2022
Messages
9
Location
Charlotte
Looks like this is not a DIY friendly repair from what I gather.

I had a friend from out of state try and help me out since he repairs some appliances. He sent me a service bulletin on quite a few GE dishwashers that have similar issues. Seems to be a “specialist” repair since you have to upgrade the software in the unit.
 

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Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
130,200
Location
Redmond, Oregon
@Nomar06 That service bulletin applies to the older GE models, your model is not listed there. You have the newer GE model.

You will likely need to contact GE at 1-800-432-2737 to have GE come out and see what's going on, Authorized GE techs have a diagnostics tool that plugs into the machine control board port and get to the root cause.

Jake
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
130,200
Location
Redmond, Oregon
It’s on the list…last one on the plastic tub section.
Nope, look again yours is GDT635H_M

The one on the list is GDT635H_J

Jake
 

Forko

Premium Member
Joined
Mar 25, 2022
Messages
22
Location
California
Any luck on the repair? I’m still waiting for the replacement to the replacement of the replacement to the replacement of the UI board lol
 

Nomar06

Premium Member
Joined
Apr 25, 2022
Messages
9
Location
Charlotte
Any luck on the repair? I’m still waiting for the replacement to the replacement of the replacement to the replacement of the UI board lol

Waiting for the parts the GE repair guy ordered.

I ended up returning the ones I bought.
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
130,200
Location
Redmond, Oregon
That is very odd, I don't know what else would be causing that problem.

You will need to contact GE at 1-800-432-2737 to have GE come out and see what's going on, Authorized GE techs have a diagnostics tool that plugs into the machine control to get to the root cause.

Jake
 

Nomar06

Premium Member
Joined
Apr 25, 2022
Messages
9
Location
Charlotte
When the GE tech came out he said they would replace the 2 boards(upper and lower) and also do some updates.

Maybe the updates is the issue why we can’t get things fixed on our own?



Still waiting on the parts to come in.
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
130,200
Location
Redmond, Oregon
When the GE tech came out he said they would replace the 2 boards(upper and lower) and also do some updates.
That could be possible, but usually the new boards come with the new updates already on them.

Jake
 
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