How do you rewire a 3phase hobart convection oven into a single phase

This is an industrial product and requires a fully qualified Engineer to attend and correct the error, three phase has a very complicated structure for motors and elements, wiring is completely different to a single phase, oven. I would expect a qualified Engineer to have the technical know how to fix your problem do not attempt to repair this yourself if you don't have the technical ability, sorry this is not the answer to your problem but I air on the side of caution when the risk to harm is greater.
John

The CN90 is an electric oven.

You either have something hitting the convection blower wheel or the bearings in the convection motor are shot.

you must understand this : your electric oven must be indicate if it is a single phase( use 3 wires for 230 2 hot wires + 1 Neutral see the diagram like dryer? you must sure about this. Normally any appliance for home are single phase NOT 3 phase.

2) If you electric oven, say 3 PHASES( use 4 WIRES, 3 hot wires+1 Neutral wires) this for industrial application +comercial NOT for home

However if you system is 3 phase you must need to install 3phase transformer.

Try parts town.com
You will need the model #

my hobaroven csd 2013g i cant opreate it pls help me

Most Baxter BXA ovens have separate power supplies, usually 120v for the controls and lights, a 120v output on a circuit breaker for the roof fan, and a 208VAC 3 phase supply for your convection motor. Older Baxter ovens may have a 3 phase service disconnect inside the electrical/burner compartment, if I recall correctly the BXA models do not and the only way to shut it off is via the 3 pole breaker at the service panel.

It can be done with a transformer, 480/ 240 single phase transformer to get the lower voltage. Then the oven will require some wiring changes to get all the elements and controls connected to two hot wires instead of three. The transformed will be sized to the wattage rating of the oven. This is a only basic description of what needs to take place.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

It could be but, the expense of replacing all the 3 phase controls would cost more than what it would be worth. Sell it and use the proceeds to purchase a single phase unit or if you are wanting to use it in a commercial building, see if you can have 3 phase installed by your electric provider.

You must use a three-wire, single-phase A.C.
208Y/120 Volt or 240/120 Volt, 60 hertz
electrical system. If you connect to aluminum
wiring, properly installed connectors approved
for use with aluminum wiring must be used.

That means that you ned a double 40 amp breaker.

Good Luck