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Dacor Double Wall Oven MCD230R Thermal Switch

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Dacor double oven. model # MCD230R Serial # VA0201937.  Thermal Switch for the lower oven keeps failing.  This is a small disc thermostat that does have a reset button.  Located between the upper and lower oven by the door lock assm.  This is the second time in 6 months it has gone bad for me.  Customer says that is has been reset or replaced "numerous" times before by other serv co.   Cabinet recirculating fans operating when oven reaches temp.  Only happens on lower oven.  Never had prob with upper oven.  Last failure was after self clean of lower oven.   Was able to bake once then stopped working.

 

Thanks in advance for any thoughts on this one.

 

 

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What is the temp threshold for the fuse? Is the lower oven not cycling properly and getting too hot? If so, Temp sensor or board could be malfunctioning due to self clean cycle.

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Dacor wall ovens use reverse air flow that goes through the door.  A common problem with the thermal fuse blowing is people broiling with the door cracked open, which interrupts the air flow.  Inquire about this.  

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... Thermal Switch for the lower oven keeps failing. 

...  Last failure was after self clean of lower oven.  

Dacor wiring diagram shows 250F

Dacor parts list # 62775

current replacement parts stamped   62775   220F

Some ovens, after many years of use, may have "stressed" insulation

and can no longer keep all of the heat inside the Oven

more than "normal" radiate out and reach the Thermal Hi-limit.

http://www.repairclinic.com/referral.asp?R=154&N=1036105

High-Limit-Thermostat-62775-00907428.jpg

 

“My Rules”:

Rule #1) Don't ever use Self-Clean on any Oven.

Rule #2) If you're thinking about using Self-Clean, see rule #1.

Self-Clean uses nearly 1000F for 3 hours or more. burnin.gif

That can wreak havoc on Electronic Controllers and Connections.

 

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I don't have access to Dacor service but nuisance tripping of the thermal cutouts is an issue with other manufacturers as well.  I know Wolf had a service kit for their units that basically consisted of small washers that were used as spacers between the tco and chassis.  As long as the cooling fans are working and providing sufficient air flow, doors are sealing properly, and oven temperatures are within proper tolerance, you might try a spacer or two.

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Dacor ovens keep the outside of the ovens cooler than any other brand. Cool, Ambient air is pulled in through the

door at the bottom by the cooling fan then across the controls, down the back of the machine the exits at the bottom

front of the range. If the oven door is left open... the cooling fan will pull the hot air out of the oven cell right across the High Limit Cut-out and electronic controls.If the rear of the range is damaged...this could restrict air flow causing the High Limit Cut-out to trip.

The High Limit Cut-outs are generally accessed from the front and through the upper air vent.

The High Limit Cut-Outs are rated from 240 ̊- 275 ̊ F depending on the model, and are manually resettable.

Never just reset a Hi-limit... there must be a reason the Hi-Limit tripped.

Did the customer open-door broil? No Dacor Products are approved for open-door broiling.

Attached air flow pattern.

post-83029-0-21592500-1376422532_thumb.j

I once saw a Dacor installed on a yacht that kept having problems because it installed directly floor level and the air flow was reduced. They never believed me when I told them that was the problem, after two years they finally put a vent in the floor going into the motor room below and had no further challenge with the oven.

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Sorry here's a better picture.post-83029-0-66173500-1376422958_thumb.j

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Thanks for all the replies

 

I will inquire about the broiling with the door open.  I assume that the oven is cycling properly as this is an ongoing problem and the customer never has complained about baking.

 

The thermo is not mounted on the cabinet. It's mounted on a vertical bracket so that it sits in the open.

 

Parts # 62775 220F is the part that I replaced.

 

Question.  If the replacement therm is rated at 220F but the diagram calls for 250F. Can or should I put it a 250F therm.

Could I use part # 82987.

High-Limit-Thermostat-82987-00624949.jpg

Edited by appliancecare

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will it mount OK ?

Can you check to see what is installed in the upper Oven ?

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Yes I believe it would mount fine.

 

Upper oven uses the same as the lower.  Part# 62775  220F.

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