Frigidaire 154227805 Temp Assure Thermostat

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Part Number:	AP2108958
MFG Part Number:	154227805
Made by:	Frigidaire

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COMMENT: Part numbers 154227808 and 154227805 are open circuit switches. They will not have continuity unless you heat test them to see if they are working. I was given bad information on these two switches when I was testing them when they were cold out of the washer, so I ordered two new switches only to find that they had no continuity either. Then I decided to temperature check my old ones by boiling a pan of water, removing it from the hot burner, and then holding the switch to the side of the pan with the meter probes attached. When the switches heated up, they both activated and then I had continuity. I am not an electrician, but I believe this to be called an open circuit since I had to use heat to activate the switch. There are a number of places on the internet giving incorrect information on these two switches, and I am not happy about the fact that I could not get correct information before I ordered the two new switches to ultimately find out that my old switches were working properly. On the other hand, part number 154290204 thermostat switch IS a closed circuit switch, will and should show continuity when tested cold. I hope this helps someone else along the way who is having the same problem. My problem with the washer is it stops after wash cycle (7 o'clock) and the rinse cycle (10 o'clock) when the high temp wash and rinse cycle option is selected, however the machine cycles thru perfectly when high temp selections are not activated. I have tested temp switch 154290204 and it has continuity, my heating element has continuity, and 154227805 and 154227808 open up when subjected to temperature test. I am still looking for where to go from here! I have seen where replacing the timer (very expensive part) did not solve the exact same problem as I have so, I have been hesitant to experiment with that part. Any other ideas of what I can check? Thanks!

Jim for Model Number FDB750RCC0

Answer Jim, The first thing that you want to do is to check the water supply temperature coming into the unit. On high temp wash the water temperature has to rise to 140 degrees as a minimum. If the water temp coming into the unit is too cold then it will not reach desired temperature ant will sit there trying to get to higher temp. You should have no less than 120 degree temp but ideally around 125 to 130 is best.

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I have a Frigidaire dishwasher and it gets stuck before going to dry cycle. I have tried turning off the heated wash, heated rinse and heated dry and it finishes the wash cycle. Does this mean that the this is the thermostat? I have looked at a list of the parts and confused which thermostat and where it is located since there appears to be three, one on the tub, resettable thermostat p/n 154290204, and two on the door, temp assure thermostat p/n 154227805 and thermostat 154227808. Any help will be appreciated. Looking at the wiring diagram, it looks like one for the heating element, one for the high temp wash and one for the high temp rinse. Is this correct, and which one is which (part nuber wise). Any help would be greatly appreciated. Thanks, Geoff Thanks

Geoff W for Model Number FDB635RBB0

Answer Hello Geoff, You would want to check the continuity of the High limit thermostat 154290204 which is located on under the left side of tub. If it is reading open then you would need to replace the high limit thermostat. The hi limit thermostat should only be open in circumstances of the temperature rising above 200 degrees. It will reset at 100 degrees. There are 2 other thermostats on the unit. The Boost rinse thermostat and the Boost wash thermostat. These two thermostats are open thermostats until they reach temp. The Boost wash thermostat 154227805 will close at 117 plus or minus 5 degrees. The Boost rinse thermostat 154227808 will close at 122 degrees. To test to make sure that they are working properly you would want to put into hot water that is above 125 degrees and check continuity to make sure that they close. You can test this with a multi-meter TJMA-DMT3. Here is a link on how to use a multi-meter. http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html

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Following up to my question above... Yes, I am getting 120 V AC to the thermostat. The heater measures about 13.5 ohms. I confirmed that it does heat during the dry cycle by opening the door and measuring with a digital thermometer. Touching directly to the element gave a reading over 200 F. I ended up replacing the thermostat (even though I think the old part was OK) and it didn't fix the issue. Today I ran the high temp cycle and placed the digital thermometer touching next to where the thermostat is mounted to see how hot it got and it only reached about 110 F. I believe the thermostat needs to hit about 124 F to close. Still confused. Any other suggestions?

Mike

Answer Hello Mike. If the heater and the thermostat are working properly, and the water is hot at the sink before starting the cycle, then the timer 154412901 may be bad and will need to be replaced. Hope this helps.

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