Maytag mgrh865qds ..breaker tripped now oven stays on unless unplugged. When first plugged in 03.0 flashes then time . Any ideas ??

https://georgebrazilplumbingelectrical.com/blog/heres-why-your-microwave-keeps-tripping-the-circuit-breaker https://removeandreplace.com/2015/09/22/microwave-oven-shuts-off-after-2-or-3-seconds-how-to-fix/
https://removeandreplace.com/2018/03/15/microwave-oven-keeps-tripping-the-breaker-what-is-causing-this/

I would start by replacing the breaker. They do become weak over time.

leave off the oven and a/c breakers and plug dryer and reset the breaker. if not tripping occurs then one at a time trip back the oven first. if no trip then trip off again and trip the a/c. if no trip then trip the oven back. if trip you may have a wire problem. if dryer trip any way then possibly you have a short in dryer. check the heating element wires,power cord at the dryer side(terminal block).

Hi,

Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

there is a short somewhere there, you will have to ohm's check it

first, un-plug unit and remove rear access cover,it could be a wire with bad insulation that has shorted to the body of the unit,could be an oven/broiler element,could be one of your feed lines to the unit shorted to ground,does it trip brkr w/o anything turned on???you can also isolate the problem that way.good luck

2 common, possible problems. 1 - there is a "short" in the plug - easy fix - replace either the cord or plug - not expensive. 2 - bad control board - not so easy, not so cheap. Is it brand new, used? Also, it could be a bad "internal breaker" - not easy!

Hello rcgrecco,
I will try to assist you but will be making some assumptions based on your problem description. First off, when you say it takes a few tries torest the fuses.. are you referring to circuit breakers? or changing out fuses a few time until it begins to work ok? In either case, the fact that it is drawing more current than the service ( fused or circuit breaker protected implies that you have one of two problems, 1. undersized service ( meaning the fuse of circuit breaker which protect the circuit is under-sized) or 2. a short internal to the stove or receptacle that supplies power to that stove.
I would approach a solution in this manner. Remove or disable power to the stove then open the wall receptacle and ( with power verified and off) tighten all wire junctions.. I have seen cases where a loose wire termination becomes resistive and then in order to meet power demand at the burner, more current is drawn which in turn causes the breaker or fuse to trip..) I would also check the terminations at the point of entry for the power cord at the stove. Make sure all the wire terminations are tight. Once you've done that, try turning on one burner at a time and see if the service remains on or trips the protector ( fuse/breaker) I wouldn't use the oven until I verified that each burner works OK.. then try the oven by itself.. and add a burner .. then two.. ( the point being is to try to determine if you have one of the heating elements shorting. 12:00 flashing is the default time setting after power is lost and restarted. I am almost 'questioning your electricians findings" since circuits do not trip unless there is a fault ( too much current being drawn or the service is under-sized for that oven) or... the circuit protection in and of itself is failing due to marginal components. The fact that it is getting worse suggests that whatever was shorting is shorting more frequently.. perhaps a heating element is shorting after it gets hot.. they are typically resistive elements and it is possible for a short to develop between the core material and the protective jacket.. I hope that helps you... or at least provides a few ideas on where to look...
Regards,
Rick

is there a way to over ride the main board start button so i will know if the board is bad. or away to test this?.