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I had the same problem as many people on here. Thermal fuse kept popping. I put a ammeter in line

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Old 05-16-2018, 11:11 PM
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Talking Solution to Thermal Fuse keeps blowing
Model Number: GU3200XTXY0   Brand: Whirlpool   Age: 5 - 10 years   

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I had the same problem as many people on here. Thermal fuse kept popping.
I put a ammeter in line with the fuse and ran normal cycle. The draw was 2 amps reading it on a digital meter. That's Way under the 10 amps that the fuse says it's rated for.

I inspected every connection I could find; door switch, motor connection, power cord to junction box in DW. All were perfect. I am running an extension cord to the DW because the outlet is way back behind a large refrigerator. I know that can be an issue.

After not finding the cause, I decided to try something. I bought an in-line fuse holder (Bussmann HMK SFE $6.00 at Home Depot) and then a few fuses (Bussmann AGC 10A $1.50 for 5) They were 150/250 V and 10 amps. I bough a few 5 amp fuses as well, just to see what would happen.

I spliced in the fuse holder where the thermal fuse would be and installed a 5 amp fuse. You just twist and pull to put the fuse in. I tried the 5 amp first. It blew! So my 2 amp reading was off but a digital meter does not read quick spikes very well.

A 10 amp has been working fine for a week now.

So unless my DW is running VERY hot, and I see no evidence of that, the fuse was blowing due to the current and yet a 10 amp fuse is not blowing any more.

I think the factory thermal fuse wears out and starts blowing at much less that 10 amps.

I'll try this for a while and see what happens. If I destroy the circuit board It will be my fault.

Read more: Dishwasher keeps blowing thermal fuse on control baord
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