GE GTD580SMF7ES CSM Tripping

[slow1]

Hello,
About a week ago my dishwasher just stopped mid wash. The display went black and the buttons didn't respond. I was able to get into service mode, there was no error light lit up. I exited out and it seemed to be run through a cycle fine after that.
The next time I ran it it did it again. Blank display non responsive buttons. I pulled the kick plate and looked for any leaking water and it appears dry  everywhere that I can see.
I entered service mode again and ran it through some tests.
First I tested the fill - no issues
Then I tested drain - no issues
Next I filled it back up and ran the circulation pump - no issues
Then I tested the heater - worked fine
Detergent module - no issues

After running through all the tests I reran them again. Now I'm getting issues.
Test fill - no problem
Circulation pump - no problem
Heater - I heard a couple clicks and it goes blank again. I dropped the control board down and it's blinking 7 times indicating the CSM is tripped.
Try again
(still full of water) Circulation pump - no issue
Drain pump - failed. CSM tripped again.
Reset
Test heater - failed again, CSM
Reset
Test circulation pump - all good
Test detergent module - all good
Test drain pump - Failed CSM
Reset
Unplugged the drain pump
test drain pump - seems ok
While still testing the drain pump I opened the door and plugged the pump back in and closed the door. Pump kicks on fine and drains the dishwasher. 
Next I unplugged the heater from the board and try to test. The board blinks 4 times like the door is open, but does not fail.
I plugged it back in and retested it and it failed.
Then I checked the continuity of the heating element from the plug. Getting 16 ohms. Should be ok right?
Reset
Then I refilled with water and retested the drain pump and it failed again.
Reset
Unplug the drain pump and test it again - Now it's failing the CSM

I found training bulletin on the CSM and kind of followed it without replacing any parts. Link to CSM training document

I'm at a loss for what else to check. Every time it failed it was a CSM error on the board and it was randomly related to the heater or the drain pump. Is it the main board that needs replaced?
Thanks

[dab147315]

Found this post so take it for what it is worth! These are two different Technicians posting to each other.
(Tech 1) 7 flashes on light is the current sense module., Something is reading to ground. GE had a snag of bad heating elements. I can never get a reading to ground but replacing element fixed every one with the 7 flashes. (Tech 2)  I was in GE training they told us replace board and heating element, only way to check heater ground fault with meager if ever buy would go with fluke 1800 series with maximum 1000 vdc.

[dab147315]

GDT580SMF7ES           Also think this is your correct model number.

[slow1]

GDT580SMF7ES           Also think this is your correct model number.

You are correct. Oops.

[slow1]

Found this post so take it for what it is worth! These are two different Technicians posting to each other.
(Tech 1) 7 flashes on light is the current sense module., Something is reading to ground. GE had a snag of bad heating elements. I can never get a reading to ground but replacing element fixed every one with the 7 flashes. (Tech 2)  I was in GE training they told us replace board and heating element, only way to check heater ground fault with meager if ever buy would go with fluke 1800 series with maximum 1000 vdc.

Thanks for the info.   
Maybe I'll try the changing the heating element first.

[slow1]

I went ahead and replaced the heating element. When I removed the old one one of the nuts was not very tight allowing a tiny amount of water through. The old element has some rust right at the connection. After replacing the element it has gone through 1 full cycle without issue. Hopefully it means it's fixed.    Thanks again for the help 

[dab147315]

Good Job.

[slow1]

Well I'm back again. It made it 6 months running just fine, but now it's not heating again. I checked the heating element and it's showing about 16 ohms and still looks good. Then I tried to check for power going to the element.  I then put it in test mode, set it to heat and tested from one element prong to the other and got 0V. Next I checked the thermostat and got 0 ohms, should be OK. Next I tried again by unplugging the element from the board and testing from the pins on the board and again got 0V.

Is it safe to say the board is toast?

[schleven]

Well I'm back again. It made it 6 months running just fine, but now it's not heating again. I checked the heating element and it's showing about 16 ohms and still looks good. Then I tried to check for power going to the element.  I then put it in test mode, set it to heat and tested from one element prong to the other and got 0V. Next I checked the thermostat and got 0 ohms, should be OK. Next I tried again by unplugging the element from the board and testing from the pins on the board and again got 0V.

Is it safe to say the board is toast?

No!  We see lots of those with no heat.  Always a bad flood sensor... WD21X10519.


It wont even work in test mode if that sensor in the flood switch is bad.  no way to test the sensor that I know of, but I would change it first.  Every one of those I have seen with no heat and a good element has been the flood switch.

[slow1]

OK, good to know. If the flood sensor is bad will it still allow you to fill water in test mode?

[schleven]

Yes. The flood sensor has two purposes. It measures the level of the water and it also has a temperature sensor in it.

[slow1]

I see, that makes sense. That just saved me a few bucks. Thanks  

[dab147315]

Let us know how you made out with this repair.

[slow1]

Let us know how you made out with this repair.

Will do. The part should be here today. Hopefully I'll have time to put it in before I have to go to work.

[slow1]

I managed to install it and run it through the test mode. Like magic it makes heat again. 
I'll try running it througha full cycle tomorrow.

Many thanks to schleven for saving me a bunch of time and money. I would have replaced the board and been pretty frustrated when it didn't fix it. 

[slow1]

I've run it several more times and everything is working as it should.
Thanks again! 

[pnwdrew]

Well I'm back again. It made it 6 months running just fine, but now it's not heating again. I checked the heating element and it's showing about 16 ohms and still looks good. Then I tried to check for power going to the element.  I then put it in test mode, set it to heat and tested from one element prong to the other and got 0V. Next I checked the thermostat and got 0 ohms, should be OK. Next I tried again by unplugging the element from the board and testing from the pins on the board and again got 0V.

Is it safe to say the board is toast?

No!  We see lots of those with no heat.  Always a bad flood sensor... WD21X10519.


It wont even work in test mode if that sensor in the flood switch is bad.  no way to test the sensor that I know of, but I would change it first.  Every one of those I have seen with no heat and a good element has been the flood switch.

Holy crap... you may have just solved a problem I spent 2 hours on today after replacing pcb thinking it had a bad relay. Didn't know that a bad thermistor would stop test mode from energizing the element.
Thanks!