The first thing I would check is the size wire supplieing the unit. Be certain that it is of sufficient size to supply the unit. Too many times I have seen wireing that is underated for the unit being serviced. The reason the breakers do not trip is they are rated at a higher amprage than the wire. This can be a serious situation and can be a high potential for a fire.
Aside from the units wiring being too small this is about the only thing that will cause the problem you are having if there is no significant voltage drop at the source when the unit is in use.
If this answer satisfies your question please click on the accept button. If it does not, please tell me so. You are not expected to accept any answer that you are not happy with. I do expect you to let me know if you are not satisfied, and what I can do to put a smile on your face.
Thank you for using Just Answer. Please tell someone about us.Best regards; The Home SmithyAfter you have accepted it is important that you leave positive feedback.
Hi. This is Steve. Another expert.
When you say that you have the correct voltage, can you tell me what that was?
How many wires come to the range box? 2 blacks and a white? What is the voltage from each black to the white?
Check that and get back to me.