Should the fan on my built in electric convection oven come on during normal 'bake' mode (ie not 'convect' mode ?

The issue you're experiencing with your Bosch convection microwave not heating in convection mode could be caused by a few different things. Here are a few things to check:

1. Check the settings: Make sure that the microwave is set to convection mode and that the temperature and time settings are correct.
2. Check the element: The bottom heating element is responsible for providing heat during convection mode. Make sure that the element is not damaged or burnt out. You can visually inspect it, if it is damaged it will need to be replaced.
3. Check the fan: The fan is responsible for circulating hot air during convection mode. Make sure that the fan is not blocked or damaged. If it is, it will need to be replaced.
4. Check the control board: The control board is responsible for controlling the functions of the microwave. A malfunctioning control board could prevent the microwave from heating in convection mode.
5. Check for a blown thermal fuse: A thermal fuse is a safety device that cuts off power to the oven if it overheats. If the thermal fuse is blown, it will need to be replaced.
6. Check for a blown thermal cut-off: A thermal cut-off is a device that cuts off power to the oven if it overheats. If the thermal cut-off is blown, it will need to be replaced.

f the oven doesn't heat and the on-off light works, test the appliance controls, motor,
and heating element .

That error means that the lower oven is not heating fast enough. IT should rise to over 150 in 5 minutes. Check the broiler and the baking coils for continuity. If they are ok then check the radiant heater in the convection fan housing.

I will say that is the control board that is not working properly. Have you try to unplugged for phew minutes?, this will reset the current settings. If not, I will star replacing the control board. Good Luck!.

Most wall ovens have a cooling fan that comes on when the oven has been on for some time. It is separate from the convection operation. It should shut off after the oven has been off for a time.

Fan is bad or blades are bent hitting frame

It would seem that the oven is small enough that a fan to flow the heat from the unit would be in use for both convection and bake modes. Usually convection ovens will have a "burst" of fan action during the bake process and it is not a steady fanning of the air that would dry out your cookies, ect. I have a small oven / microwave and my larger oven is a GE that has the "burst" convection that I described. Might not be that much help, but it's hard without more info on your unit. sometimes the model is behind the oven door.

I would suggest that you check the oven element, it sounds as though it is faulty to me.

Bake- Normal convection- both upper and lower heating elements.

Conv. Bake- Semi-forced convection- both upper and lower elements, heat is then distributed throughout the oven via the fan.

Broil- radiation- The heat is radiated by the ifrared broil element.

Broil & Fan- Radiation and Ventilation- The radiated heat from the infra-red broiling element is distributed throughout the oven via the fan.

I have just checked the baking guide in the manual and have found that it may not be us after all. (Maybe this is why they telll us to read the whole manual. Well, I never have) According to the cooking time for Baking, the range is very extensive. For example, an angel cake at 350 could take from 28-50 minutes, buscuits at 375-400 could take 8-16 minutes, layer cakes at 350-375 could take 25-40 minutes, pound cakes at 325-350 could take 45-70 minutes and fresh pies at 400-450 could take 35-60 minutes. Basically, the baking directions on the box means absolutely nothing to use Amana oven owners. We have no choice but to cook our food or baked goods until they are cooked, whenever that may be. :) Linda