I have a Miele H4640 oven which will not maintain temperature when Fan setting is used. It has accurate and steady temperature when conventional or bottom heat are used.

A Model # would help us allot

if you see a fan in the back it possibly is .

Yes, use the oven as though it is a fan oven because when the cavity gets to temperature the fan cuts in.
Hope that helps.

when the oven etc is new it will make a smell. put the oven on the hotest temp and open a window to burn off the oil grease used when the oven was fitted, then when it cools down give it a good wipe round inside with some oven cleaner then the smell should be gone.

hi,

as you turn the dial for the different cooking functions the oven automatically defaults to certain temperatures. you can however adjust the temperature using the plus or minus buttons as well

Hi,
The baking element is probably the problem...

Check out this tip that I wrote about this problem...

http://www.fixya.com/support/r4511800-oven_problems_electric_oven_heating

heatman101

I detected a similar problem following the sudden appearance of Err1 in the display. (Oven 4-5 years old, and the grill element failed when it was 3-4 years old). This indicated a temperature sensor problem. My local dealer came with his Thermocouple and confirmed an "under temperature" reading on the standard and baking settings. I agree that the fan setting is probably OK. He replaced the sensor. I monitored the situation for a while and was not happy because an under temperature could be quite dangerous when cooking certain foods, and also causes problems when baking bread.

The location of the oven sensor is also a problem because it is at the top right by the grill which also serves as the top heat source.

I had corresponded with Bosch about this and their response was, frankly, less than satisfactory. In the end I decided to call out their engineer (cost £85-ish) who wired my oven up to his computer. In the end he said that the oven was working as it should be (despite it taking a very long time to actually reach the target temperature of 200C.

In my view of I want 200C, then I should get 200C, not an approximation.

Interestingly the secret info (not in the manual) is that the temperature bar readout does not indicate that it has reached the actual temperature, but may be 90% of the temperature (so if you want 200C you get 180C.

An unsatisfactory solution is to get an oven temperature of the meat probe type and put that in the oven, then you will get a more accurate reading of the temperature. You would need one that goes above 200C (my first one only goes to 200 but I have found another that goes to 250C). Mine is by CDN model DTP482, any good cook shop should stock this.

Andrew Finch

element should glow dull red when on fan oven but not bright red. are you sure fan is operating? remember there are two fans - oven fan and casing fan and you may be listening to casing fan

If everything on your B1691N0GB oven seems to be working, i.e. all the lights are on and fan comes on in fan oven setting, but there is no heat from fan oven, conventional oven or grill, try turning your oven off at the mains, then turn on again. If the temperature display then shows 444, your oven is locked. To unlock, make sure the central control knob is in the "out" position, then press the fan oven and light buttons simultaneously for 10 seconds or so, until 333 appears on the display. Your oven is now unlocked.