dishwasher tripping dedicated circuit but not others...


  #1  
Old 02-18-14, 07:41 AM
F
Member
Thread Starter
Join Date: Aug 2013
Posts: 39
Upvotes: 0
Received 0 Upvotes on 0 Posts
dishwasher tripping dedicated circuit but not others...

In the process of a kitchen remodel. I have a dedicated 20 amp circuit for the dishwasher and a dedicated 20 amp circuit for the garbage disposal, both under my sink. They are protected by AFCI breakers. I plugged in our (6 year old) dishwasher that had been sitting outside for a while to its circuit and as soon as it started it tripped the circuit. Tried again and same thing. I plugged it into the garbage disposal's circuit and the same thing happened. I then took an extension cord and plugged the dishwasher into one of the kitchen small appliance circuits (20 amp, GFCI breaker) and it works fine.

I plugged a shop vac into the dishwasher circuit and it worked fine, as did the garbage disposal on both circuits.

I then swapped out the AFCI breaker on the dishwasher circuit with a GFCI thinking that was the problem and the same thing kept happening.

Any idea whats going on and/or how I should proceed figuring this out?
 
  #2  
Old 02-18-14, 07:54 AM
W
Member
Join Date: Feb 2006
Location: USA
Posts: 6,396
Received 63 Upvotes on 55 Posts
Dish Washer

I plugged in our (6 year old) dishwasher that had been sitting outside for a while
Look for moisture damage/short in the dish washer circuitry.
 
  #3  
Old 02-18-14, 07:57 AM
CasualJoe's Avatar
Member
Join Date: Jan 2010
Location: United States
Posts: 9,872
Received 185 Upvotes on 166 Posts
This is just a guess, but I believe the AFCI breaker is seeing some arcing at the motor switch. I don't believe either the disposer or dishwasher are required to be on a AFCI circuit, I'd change them both to regular breakers.
 
  #4  
Old 02-18-14, 06:46 PM
F
Member
Thread Starter
Join Date: Aug 2013
Posts: 39
Upvotes: 0
Received 0 Upvotes on 0 Posts
ultimately I will put it on a regular breaker if I have to. I am just curious why it would be tripping the GFCI as well on its own circuit, but runs on the small appliance GFCI circuit.
 
  #5  
Old 02-18-14, 10:51 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 65,076
Received 3,976 Upvotes on 3,569 Posts
If it trips one GFCI it should trip the other one.

A typical problem that would cause a GFI to trip with a dishwasher is a defective heating element. It would be a good idea to check the element with an ohmmeter before putting the dishwasher on a regular circuit. You would need to disconnect the wires to the heating element and check from the terminals to ground. No continuity should be seen.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: