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My oven heats to 350 perfectly as measured by oven thermometer.

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After that, it'll only heat...
My oven heats to 350 perfectly as measured by oven thermometer. After that, it'll only heat to 369 when set to 400, 380 when set to 450, etc. Heats fine to 350, but lower heat when set higher. Have replaced the probe and eoc already.
Submitted: 8 years ago.Category: Appliance
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Answered in 2 minutes by:
7/1/2009
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
Tom Johnston
Tom Johnston, Home Appliance Technician
Category: Appliance
Satisfied Customers: 8,007
Experience: 20 years experience
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What is the make and model# XXXXX
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Customer reply replied 8 years ago
Frigidaire FEFL79DCA
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
Do you have the manual for your unit?
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Customer reply replied 8 years ago

I have the service data sheet that was on the rear of the unit, as well as the wiring schematic and the entire parts list.

Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
Some of the computers need to be calibrated i'am trying to find out if yours is one of them.I'am having a hard time finding a manual for your unit.
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Customer reply replied 8 years ago
The unit has worked fine for 3 1/2 years and has just been doing this for a few weeks now. When I replaced the electronic control unit, it is doing the same thing. I could see the need to calibrate if it was heating to a few degrees off the desired temp. But it is about a good 30 degrees off when bumped to higher temps and only gets to 369 when set to 450.
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
When did you replace the oven temp sensor?
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Customer reply replied 8 years ago
Couple weeks ago. It was part number 37 on the Body section of the Parts List. Replaced part 20 on the backguard diagram (EOC) three days ago. The electronic control has been problematic in other Frigidaire models according to info on the Internet.
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago

OVEN CALIBRATION

Set the electronic oven control for normal baking at 350°F. Obtain an average oven

temperature after a minimum of 5 cycles. Press STOP/CLEAR to end bake mode.

TEMPERATURE ADJUSTMENT

1. Set EOC to bake at 550°F.

2. Within 5 seconds of setting 550°F, press and hold the bake pad for approximately

15 seconds until a single beep is heard (longer may cause F11 shorted keypad

alarm).

3. Calibration offset should appear in the display.

4. Use the slew keys to adjust the oven temperature up or down 35°F in 5°F

increments.

5. Once the desired (-35° to 35°) offset has been applied, press STOP/CLEAR.

Note: Changing calibration affects normal Bake mode. The adjustments made will not

change the Self-Cleaning cycle temperature.

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Customer reply replied 8 years ago
I understand this line of thinking, but why all of a sudden would this be happening after 3 1/2 years of normal operation?
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
When you replace the computer it needs to be calibrated.
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Customer reply replied 8 years ago
Well, ok then. When I set it to 350, it heats to 348. So setting the offset 2 degrees higher will make it heat 29 degrees hotter at 400 setting?
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
Just follow the instructions i sent.
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Customer reply replied 8 years ago
I'll do it.
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
Ok just remember the manufacturer allows a 10% difference in the temp +/-
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Customer reply replied 8 years ago
Just programmed a 5 degree offset. I have it set to 400 degrees. Will let you know if it gets there. Normally it sits at about 369 when set to 400.
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
ok
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Customer reply replied 8 years ago

Set to 400. Oven beeped like it was at 400, but internal temp says 370.

 

Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
Thats less than 10% you just need to find a happy medium.
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Customer reply replied 8 years ago

Ok, at 450, I get an internal temp of 383, which is greater than 10%. So, when I set the offset does it change the oven temp? Or does it just change the way the temp reads?

 

Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
It changes the temp how many times are you letting it cycle before you take the reading
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Customer reply replied 8 years ago
minimum of 2 cycles, but I still have it set at 450 and the temp is at 383. It has been at least 5-7 cycles at this point.
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
Well maybe you got a faulty board.
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Customer reply replied 8 years ago
hmmm. that would mean the original board was bad too then.
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
Why did you change the board because of the temp?
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Customer reply replied 8 years ago
couple of reasons....first the temp issue. seems that up to 350, all is good. incrementally going upward in temp, there is an increase in difference between the desired temp and actual temp. second is that I hear a lot more clicking when setting the temp at 500 and it sits at 385. it's like it knows it isn't at 500, but something is limiting the heating at the higher temps. i don't see any other temp sensors or anything in the parts list, so I went with the electronics.
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
All there is is the tempsensor and the board.
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Customer reply replied 8 years ago
It would be nice if I had a code or something ya know? Could it be the element?
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
Do both elements come on for preheat?
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Customer reply replied 8 years ago

I'll check. Should they?

 

Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
Yes
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Customer reply replied 8 years ago
I turned it off and opened the door to cool it down. Then I'll set it to 400 again and check.
Customer reply replied 8 years ago
Well I assume that the top should glow orange just like the bake element when preheating?
Customer reply replied 8 years ago
Okay Tom, the top element works, but only on broil. It does not glow on preheat or on the clean cycles.
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
Thats the problem you need to check all the wireing for the broil element.
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Customer reply replied 8 years ago
Ok Tom, all the wiring looks good. I turned on and measured 240 across the bake element leads and nothing across the broil leads. Even on clean, the same. But on broil, the top element comes on. That tells me that the wiring to both the top and bottom elements is good because when voltage is applied to both, they work. Now the two elements are tied together by an orange wire coming off the "L2 Out" from the electronic control. Seems that voltage to both isn't being applied when called for (preheat). Common sense would maybe say its the eco I just replaced or the top element. Am I thinking right?
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
Does your tester have a ohms setting on it?
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Customer reply replied 8 years ago

Yes

 

Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
Do you know how to check for continuity?
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Customer reply replied 8 years ago
not really
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
On the ohms setting is there the number 20k?
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Customer reply replied 8 years ago
yep
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
Set it to that touch the leads together what happens?
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Customer reply replied 8 years ago
I get zero
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
The wire that goes from the broil element to the board.Disconnect one end and test it what do you read?
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Customer reply replied 8 years ago
unplugged the blue wire that comes off the board to the broil element and got zero. there's another wire that comes off the board to both the broil element and the bake element. It is orange.
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
Is it a single wire if it is we know it is fine?
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Customer reply replied 8 years ago
the blue one i tested was single right from the board to one side of the element. Result was zero. The side of the broil is orange that is spliced together withone side of the bake.
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
Ok set the meter to 120 volts take the blue wire put one lead in it when it is removed from the element.Touch the other lead to the metal on the stove turn it on do you get voltage.
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Customer reply replied 8 years ago
not to sound stupid, but you want the oven on now?
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
Yes to test the blue wire for power.It needs to be disconnected from the element to test it.
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Customer reply replied 8 years ago
Okay, I turned the oven to pre-heat with the blue wire disc'd from the element. It does not get any juice at the end I disc'd from the element or at the control unit.
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
You have a bad control board.
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Customer reply replied 8 years ago
Something else. When I reconnect the blue wire and turn the oven on now, I get 120V at all 4 points on the elements, but still the temp is low at 400 degrees. Is the blue wire some sort of communicator with the control unit? Cause it is getting juice now and not glowing....
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
Each wire has to get 120 volts the blue one is not.
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Customer reply replied 8 years ago
And the element would not have anything to do with it? Just asking so I can go back to the folks that I ordered the new control unit from and have them send another on out.
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
The element works we know that when you put in broil it glows.The control board is bad.
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Customer reply replied 8 years ago
and finally, when everything is connected together again and I turn the oven on, i get 120 volts on the blue wire at the element and at the board. I presume that the 120V is coming from the orange wire on the other side cause when I measure at the element where the blue wire connects, i read 120V. Is this normal?
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
The voltage is comming from the other wire.
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Customer reply replied 8 years ago
Okay, I'll accept that then. Thanks for your time and prompt replies.
Appliance Technician: Tom Johnston, Home Appliance Technician replied 8 years ago
You are welcome.
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Satisfied Customers: 8,007
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