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Samsung DMR78AHS dishwasher runs nonstop and do not enters drying cycle


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4 replies to this topic

#1 multi_greg

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Posted 22 January 2012 - 10:57 PM

At first, Samsung DMR78AHS dishwasher stopped during the washing cycle and displayed HE error code (Heating Element). Prior, I also noticed it wasn’t washing or drying well. Then my plumber discovered that the dishwasher never was properly installed (thank you Lowe’s!): The discharge hose was fished directly through the subfloor and attached to a P-trap down in the basement. My plumber thinks the dishwasher continuously drained water, thus exposing the heating element causing it to probably burn-out overtime... Is that possible?

After this discovery, I properly connected the discharge hose to the sink per the installation instruction to see what that would do but didn’t replace the heating element. The dishwasher would now work and no longer displays HE error code but would never enter into the drying cycle: The countdown timer freezes at the 22 minutes mark and seemed would continue washing forever if I didn’t manually stop the cycle.

I would love to make this thing work and use it a little longer if worth the time/$ to fix it! Where to start? What should I begin to test/replace? Heating element? PC Board?

Thanks.

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#2 john63

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Posted 22 January 2012 - 11:07 PM

Check the continuity of the HEATING ELEMENT with a test meter---if "open" replace the HEATING ELEMENT.

If "good"---it's very likely that the HEATER RELAY---located on the right side of the dishwasher at floor level---has failed.

During the DRY CYCLE---there should be 120 volts AC coming from the HEATER RELAY---to the element.

Most HEATING ELEMENT or HEATER RELAY failures occurred in homes that had a "Tankless/Instant Water Heater".

Other possibles are:

1) One of the DOOR SWITCHES FAILED
2) MAIN BOARD (very rare)
To eliminate:

Musty odor

L-O-N-G cycle times

Dingy/yellowing whites

Suds error message

Slow spin speeds

Intermittent water leaks (from rear of washer)

And other annoying symptoms which vary brand-to brand.

Read below:

The *correct* amount of HE (High Efficiency) detergent that should be used in any front load or agitatorless top load washer with tub sizes 3.0 cu ft and larger is as follows:

HE: (2) Tablespoons Per Wash Load

HE 2X: (1) Tablespoon

HE 3X: (1) Teaspoon

Perform a TUB CLEAN CYCLE every (4) months.

Use: "Tide Washing Machine Cleaner"

#3 multi_greg

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Posted 23 January 2012 - 08:42 AM

Thanks for the help.
A couple more questions:
What does a HEATER RELAY looks like?
What does a DOOR SWITCH looks like and where is it located?

#4 multi_greg

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Posted 23 January 2012 - 09:07 AM

What does a HEATER RELAY looks like?
What does a DOOR SWITCH looks like and where is it located?


Are these parts the correct parts?
Dishwasher Door Latch - DD34-00002B ==> http://www.repaircli...400002B/1603323
Dishwasher Power Relay - 3501-000260 ==> http://www.repaircli...1000260/2028620

Edited by Samurai Appliance Repair Man, 23 January 2012 - 09:35 AM.
Deleted images from competing parts vendor. Added part links.


#5 Samurai Appliance Repair Man

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Posted 23 January 2012 - 09:37 AM

And forget about the heating element ==> http://www.repaircli...Number=DMR78AHS

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Recent blog entries on this topic

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Tips for troubleshooting a Samsung dishwasher with an HE (heating element) error

By Samurai Appliance Repair Man in Samurai Appliance Repair Man's Blog, on 23 January 2012 - 09:47 AM

This problem could manifest as the dishwasher running nonstop and not entering the drying cycle. Academy Fellow john63 points us in the right direction:


Check the continuity of the HEATING ELEMENT with a test meter---if...

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