How can I fix the electrical hookup on my new electric oven?
Your description of red, black and conduit indicates that you do not have neutral but just ground via conduit. That is NOT a good thing. A little background:

Ovens, cooktops, etc. typically need 240V for heating elements but 120V for lights and controls. In order to get 120V, you need a neutral wire (normally white).

In the old days, there was a neutral but often no ground. So ground would piggyback on neutral. That was OK from the perspective of normal usage but a bit problematic if things go wrong in certain ways. So now (actually for many years), a 4-wire connection - hot, hot, neutral, ground (ground can be via metal conduit though, doesn't have to be an actual wire) is required.

But often stoves (and dryers) are still hooked up to a 3-wire connection. A 3-wire connection wouldn't be so bad if it were "ground piggybacked on neutral". But you have the opposite - neutral piggybacked on ground. That is not a good thing.

The solution is to install a proper cable. It must be the right size for the breaker &amp; device (that would probably be 8 AWG) and include two hots, neutral and ground. Alternatively, if you are running individual wires in metal conduit with the conduit acting as ground then you can use three individual wires, two hots and neutral.

Updating based on pictures:

You have a 4-wire connection on the oven. However, there is a "copper bridge" to connect neutral (white) and ground (green screw). You could do that in the old days. But current code says you should:


Have a 3-wires + ground connection. Ground can be green or bare (including possibly the conduit itself) but it neutral can not be green. So that means you need to add a white wire for connecting to the white terminal on the oven.
Remove the "copper bridge". That is a must. The instructions discuss using the copper bridge for the situation where you don't have a separate ground and instead rely on neutral. But in your case, you don't have a separate neutral and instead are relying on ground! You can't do that!


Run a new white wire through the conduit. Remove the copper bridge. Connect black, red, white, green to matching places on the oven. Then see if there are any remaining problems. But the current installation (no neutral) is WRONG.

I found the official installation instructions (PDF). Follow the 4-wire instructions in step 6, not 3-wire step 5.

What is a bit strange, which I don't quite understand, is that the 4-wire instructions for a Power Cord specifically say "Cut and discard the ground strap." But the 4-wire instructions for Conduit do NOT say to do that.