Lights and outlets in some parts of the house won't work unless the stove/oven is turned on. Any idea what would cause this and how serious of an issue it is?
An electrician can fix this for you.
It sounds as though you have a 4 wire stove (neutral and ground go to stove), other loads are on the same circuit, and the neutral wire is open.
Two hot wires going to the stove, typically red and black will measure 240 volts between them. There should also be a white wire, a neutral, which when measured to the red or black should be 120 volts each.
If the white wire is broken or disconnected between the power panel and the stove receptacle the red and black will still measure 240 volts between them but you will lose the 120 volt when measuring to the neutral (0 volts).
When the stove is turned on, it will place a load between the hot wires which will cause a voltage to be present between the hot and neutral wires, allowing your other devices to work.
If you intend on using the stove and these lights and outlets, this should be fixed quickly. The voltage present could damage connected devices.
If this were my home, I would call an electrician right away, and get it fixed.
Did you find the problem I'm having the same issues after trying to intall a light fixture
I had this same issue and was able to resolve it by replacing the main breaker switch itself.
My brother is having this problem and his daughter just died, can we just unplug the stove ?