Question about Whirlpool RBS305PR Electric Single Oven
Posted by Anonymous on
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Posted on Jan 02, 2017
This seems to be a common problem with these ovens. The oven got too hot and the tco (Thermo cut off)tripped. This will have to be replaced. It is located behind the control board.
Posted on Aug 25, 2007
The first time we used our Whirlpool oven the same thing happened - no power and yet the circuit breaker was not blown. I called Whirlpool, and they sent out a technician to check it out as it was still under warranty. He said the temperature was off (too hot) by 20F - he adjusted. He also replaced the blower. What he did not tell me was that the thermal fuse had blown, and he replaced it - this was the REAL cause for the failure. I got the impression that he did not want to let me in on the secret. He did not note on the paperwork that he replaced the thermal fuse. Last week I decided to run the oven through the self-cleaning cycle (the oven is now 8-1/2 yrs old) - I don't believe that we cleaned the oven but a couple of times since the first time that it was "repaired." I used the default 3-1/2 hour setting. Everything appeared to be fine - the oven went through the cleaning cycle with no apparent problems. The display now read "cool down" - I went to bed thinking everything was okay. I got up the next morning only to find out that the power was out. I called Whirlpool and demanded that they repair the unit again as they clearly never fixed it correctly in the first place. They offered me 15% off on a new oven - WHOOPEE! I asked to speak with the supervisor - he did not budge either. I was upset, and I told him that I would NEVER purchase a Whirlpool appliance again! I decided to tear into the oven to see if I could detect anything wrong. I pulled out the front panel - everything looked okay. I then noticed the "thermal fuse" - I did not know what it was called at the time, but it looked familiar. I checked voltage on either side of the fuse and found the voltage to be zero on the downstream side of the fuse. I pulled it out and read the information on the device: Microtemp 110C. I called a local appliance repair shop - they told me that it would cost $50 to purchase a new fuse! I told them that seemed very high. I ended up stopping at Radio Shack. They have thermal fuses in various temperature and voltage ranges. I got a 144C 10A fuse and carefully soldered the connectors to it and replaced the protective plastic sleeve. I actually bypassed the thermal fuse in order to use the oven before I found the replacement fuse. While it is a good idea to have a protection device for the slim chance that an oven may malfunction by overheating, it is not a necessity for the functionality of the oven. Hopefully, the thermal fuse will not fail during my next attempt to self-clean the oven. I do have a concern about the 10 amp rating, but I'm sure that it will work fine.
Posted on Apr 15, 2009
SOURCE: oven won't heat
There is a design problem with certain model Whirlpool ranges where the thermal fuse blows during self-cleaning (auto-clean). This may be because of inadequate insulation, causing the outer panel to overheat. When the thermal fuse is replaced, the range will work, but it will blow the next time auto-clean is done. To safely work around the problem, the thermal fuse may be replaced with a thermostat, which will reset itself once the oven has partially cooled off. If the part number of the thermal fuse is 9759243, it will blow at 120 deg C (248 deg F). This can be replaced to a Selco Part# SES-L250 thermostat. The terminals are perpendicular (90 degress), so they have to be bent to 30 degrees for the wires to fit behind the back panel.
Selco part# SES-L250 specs:
3/4 in. disc
open on-rise (normally closed)
open (cut-out): 250 deg F
close (cut-in): 220 deg F
temperature differential: 40 deg F
Available: Selco distributors: http://www.selcoproducts.com/distributors.php
and online at
Allied Electronics http://www.alliedelec.com
If the Selco SES-L250 'surface mount' thermostat is not available, an 'airstream type' thermostat can be used with a few differences:
1) I recommend to replace it to a 240 or 230 deg F thermostat. The reason for the lower cut-out temperature is that an 'airstream mount' thermostat will not be flush with the back panel, as is the original 250 deg F 'surface mount' one, so it may cut-out at a higher (unsafe) temperature.
2) I recommend to add Heat-sink compound between the thermostat and the sheet metal. This is used for computer processors and is available at computer and electronic component stores.
3) An 'airstream type' thermostat is thicker than the original 'surface mount' one, so longer screws will have to be obtained. The sheet metal tabs on the thermostat will bend slightly when installing.
4) The terminals are perpendicular (90 degress), so they have to be bent to 30 degrees for the wires to fit behind the back panel.
Recommended 'airstream type' thermostats:
General Electric LS2-240
Posted on Nov 03, 2009
Check out this tip that I wrote about this problem...
Posted on Apr 28, 2010
Tips for a great answer:
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Seems like you found out the hard way what I wrote about in this tip...
Check it out it also contains some thing to try on how to unlock that oven..
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Asker's Testimonial " Wish I had read this first. I never would have used the self cleaning option. Thanks for the info!! " - amymrocks
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