When I turn on the oven it heats up to the required temperature but then sometimes - not always - it cools right down to about 100degrees for no reasons. The light stays on and the fan keeps going so I don't know that it has done this until I check the food and it is not cooked. Please help, it's driving me mad as I now have to keep checking it every 5 mins or so. I have tried re setting it, using the timer, not using the timer etc. but nothing seems to work.
Have same problem, I am repairing our 648HM double oven. Top oven overheats. I am an electronics engineer. I found that top oven fan has failed, this is the first thing to replace. The grill element also failed which maybe due to the overheating oven. NIGEL
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Typically an oven beeps when the interior temperature macthes the temperature where you set the dial. This is an audible signal to that fact and particularly helpful when you need to pre-heat the oven. For example it you want to cook something at 350 degrees, you set the dial at 350. When your oven reaches that temperature it beeps to let you know. Some cooking directions tell you to preheat your oven. In that case, when you set the dial to 350 and wait for the beep...you know you are safe to start your cooking process because the oven is now pre-heated to the temperature you set. If your recipe requires a pre-heated oven, and you don't wait for the beep, your taking a guess at what temperature you're cooking your food. Additionally, if you want to know what the internal temperature of oven is and your oven is heated...you simply turn you dial setting and listen for the beep. Again, if you set your oven at 350 and you want to know how hot your oven is... slowly turn the dial setting. If the oven beeps at 275 then that's how hot your oven has gotten. To let it finish heating to 350 just reset the dial and wait for the beep.
The thermostat is the cause of the problem, normally the the only cure is to replace the oven thermostat,completely, or alternatively, compensate by setting a lower temperature when cooking.
this will work o/k if it is always the same variation in temperature across the range .
Oven temp exceeds 590 w/ unlocked door
High resistance or interference in oven temperature sensor. Replace oven temperature sensor
F2 Note: Also see fan thermal switches
Indicates that oven is over temperature in one of the following modes within either a cooking or clean mode of operation. · Control senses oven temperature above 650 degrees F with the door circuit in the unlock mode. · Control senses oven temperature above 935 degrees F with the door in the locked mode. · Stalled cooling fan or airflow problem.
· Look for welded relay contacts. (Heating elements on in off mode). · Look for open thermal switch in lock motor circuit. Switch is normally closed and will open if area overheats due to fan not operating. Look for cause - fan thermal switch not closing, fan stalled, etc. · Look for high resistance in the oven temperature sensor circuit due to high contact resistance (poor terminal crimp, deformed terminals, loose connection) or intermittent solder joint on control or intermittent oven temperature sensor. · Look for electrical noise interference in the oven temperature sensor circuit (Ham radio, cordless phone, etc.).
When you first use your Oven, the Oven will need to "settle". That is, it needs to burn off production residues and dust. The metal used in the Oven will also expand slightly when first used. You will experience some crackling and a strong smell. This is perfectly normal and we advice you anticipate this "settling" prior to use. Using an empty Oven, select Function 4 and set a temperature of 250°, allow the Oven to "settle" for hour, turn to function 3 and heat for a further 1/2 hour. Multifunction Oven Function Selections
2. Defrost - This function activates the fan only, (no heat is used) to allow controlled and hygienic defrosting. 3. Conventional cooking - Normal or traditional cooking functions using the top and bottom elements. When using this function set the thermostat between 50 - 250°C. When the desired temperature is reached the yellow light will go out and then alternate between lit and unlit as the temperature is controlled. 4. Fan-Forced cooking - This selection is best for multilevel cooking as the heat generated by the central element is circulated around the Oven, creating an even heat environment. You will need to set the thermostat dial between 50-250°C for this function. 5. Center Griller - For best results set the thermostat to MAX. The door may remain closed or completely open. 6. Large Griller - For best results set the thermostat to MAX. The door may remain closed or completely open. 7. Fan Griller - This function combines the grill element with fan assistance and is used in conjunction with the thermostat. The Oven door must remain CLOSED during cooking. The thermostat dial should be set between 50-250°C for this function. 8. Fan-assisted Baking or Patisserie Setting - Combines the concealed bottom element with fan assistance and is used in conjunction with the thermostat. The Oven door must remain CLOSED during cooking.
Advanced Oven Features Cavity Cooling The Oven has an advanced cavity cooling system. A cylindrical fan is mounted on the rear outside frame of the Oven. This fan assists the movement of air through the Oven cavity keeping it cool. In addition to reducing the temperature in the Oven cavity, the air is blown out around the Oven door handle which keeps the door handle cool. The cooling fan is activated when the Oven light or any cooking function is selected and will switch off after all Oven functions have been turned off. Triple Reflective Door Glazing Some Ovens have two levels of removable door glass. The two inner layers are removable and are made of a reflective glass which, in effect, reflects heat back into the Oven and results in a significant reduction in the outside door surface temperature. To clean the door glass, use a coin or large screwdriver to remove the screws. Wipe both sides of the inner, middle and outer glass. Wipe the sealing gasket. Don't forget to replace the rubber sealing gasket around the centre glass layer before replacing the glass. Ensure the narrow air gap lies between the inner and centre glass layers and the wider gap lies between the centre and outside glass layers. Tighten each screw gradually, one then the other until firm. Do not overtighten.
Wipe Clean Enamel (Extra Optional) Some models have easyclean blue enamel paint throughout the internal cavity walls. Other models have baking trays and grill pans finished in the soft grey super tough "wipe clean" enamel. This enamel is less porous than conventional, so that food does not adhere as easily. Simply wipe clean with a soapy cloth or creme cleanser when cooking is finished. For baked on residue, use a smooth scraper or if necessary a non-caustic Oven cleaner.
Drop Down Grill Element (Extra Optional) The removal of a single screw at the front of the upper grill element in some models allows the element to drop down so that cleaning of the roof of the Oven is made easy. On completion of cleaning, simply replace the grill element and secure with the screw, finger-tight.
Function 3: Normal Oven baking using heat from both the upper element and concealed lower element.
To bake, place the Oven rack in the appropriate position according to the type of food to be cooked. Turn the Function Selector to Position 3 and the thermostat knob to the correct temperature, and allow the Oven to fully preheat for best results.
Ideal for cooking casseroles, soufflés, roast, meats, and other items which require a slow method of cooking.
Function 4: Fan-forced central element cooking requires slightly different timing techniques than normal cooking. The fan draws the air in and over the central element which is positioned around the fan and then circulates it back around the Oven cavity. The even distributor of heat allows foods to rise and cook simultaneously regardless of shelf level. Lower cooking temperatures and in some cases less cooking time is another advantage of this feature.
Turn the Function Selector to Position 4 and turn the thermostat to the desired temperature. Pre heating takes much less time than a normal bake Oven.
Note: When cooking meats, for best results always preheat the Oven to ensure the meat surface is sealed to lock-in juices for a moist and tender result.
Fan forced cooking is ideal for multilevel cooking e.g.. patty cakes. Another advantage of fan forced cooking is that different types of food may be cooked simultaneously without mixing the aromas or flavours. When using the Oven in this way, ensure that all the foods require the same cooking temperature and check the finish times of each dish for best results.
Please note that fan-forced cooking is faster than conventional methods, so take care not to burn your food when you first start using this method.
Function 5 & 6: During grilling the door may remain closed or completely open.
This function offers the traditional grilling method necessary to achieve proper browning without overcooking the interior of the foods.
Position 5 activates the centre section of the upper grill element only, which is ideal for browning smaller portions or thinner cuts of meat.
Position 6 activates the entire upper element for the grilling of large quantities or thick cuts of meat.
Allow the griller to pre-heat for approx. 2 minutes before sliding the tray into position.
Place the grill tray into the roasting pan and arrange food according to the function you have selected, either in the centre of the tray or spread across the full width of the tray. Position the tray at the correct grilling level and turn the thermostat control to MAX for best results.
As the temperature is set to MAX you may need to adjust your grilling shelf height to suit the desired cooking result. If the tray is too close to the element, the food will be exposed to the full effect of the element and may burn and create smoke.
Cooking is determined by 3 things so let's look at what they are and what they do.
The Fan Oven Element - This is very much the same as a light bulb only instead of giving off light it gives off heat. Like a light that is switched On or Off by a wall switch, the Element is switched On or Off by a Thermostat according to the temperature required. In short if the element fails your oven will be cold.
The Fan & Motor - This sucks the air in through the centre mesh and circulates it around the Element and pushes the heated air out of the top, bottom and sides of the back-plate. Fan ovens cannot heat properly if the fan is not running OR if the fan runs too slowly as the motor starts to fail.
The Thermostat. - This is basically an On/Off Switch that responds to the temperature in the oven. If The Fan is running correctly and you are achieving some temperature in the oven, then the fault will be with the Thermostat.
I hope this Helps - Terry
ALWAYS ISOLATE THE POWER SUPPLY BEFORE WORKING ON THEI APPLIANCE!
After the oven is switched off, the after-run of the cooling fan is controlled by an electromechanical thermostat switch. The fan can switch back on, due to residual oven heat that accumulates within the oven's outer case and reactivates the cooling fan temperature switch.
Considering yours is making buzzing sounds and activates on and off, the fan's thermal switch may have dirty contacts or just be defective and require replacement.
there is more to this than meets the eye if youre oven takes a long time on fan setting it may be thermostat but more likely to be fan not turning at all or quickly enough the stat capillary is above oven element and if fan not blowing air away from capillary oven stat will shut oven temp down too soon if using conventional heat eg no fan make sure there are no full size trays directly on bottom of oven this will block heat from bottom element effectively giving only half the heat output.