Can two separate convection units (microwave and oven) be combined/joined into one cord and plugged into one outlet and BOTH work efficiently? The contractors I hired combined all wires to both unit

Check the 20 amp fuse where the power cord ends inside the oven. If it is open check the latch switches. If the switches check ok the invertor is probably bad, smoking.

Ken,
Usually there is an internal fuse and that is probably your problem. You will need to take off the outside cover of your microwave and then look where the power cord goes into the back of the unit. Look for the black wire coming out of the power cord and follow it. It should take you to the fuse. Hope this helps!

Hello

Check the Power Cord

Verify that the power cord is properly connected the outlet; the plug might have been removed to make way for another appliance. Do not connect the microwave to an outlet via an extension cord or plug adapter; the oven must be directly connected to an outlet.
Switch the Outlet on

Turn the outlet on, if possible, using the switch on the wall behind the counter or on the plug itself. Some microwaves have a separate power switch that must be in the correct position before you can begin cooking.
Reset the Oven

Unplug the oven, wait a few seconds and reconnect the power. A power surge could have temporarily rendered the oven inoperable. The oven should start up as normal when you connect the plug to the outlet.
Check the Fuses and Breakers

See that the fuse or breaker protecting the oven's circuit is still active. Replace the fuse if it has blown, or reset the breaker to restore power to the oven. Stop using the microwave if it repeatedly blows fuses or trips breakers.

Hello

Look to see if the microwave power cord is securely plugged into a live power outlet. The power cord cannot be loose for proper function. Move other appliances to a separate outlet if possible.

Replace or reset the circuit breaker or fuse if blown or tripped.

Unplug the microwave and wait several seconds before plugging it back in to reset.

Make sure there are no current functions in use. Press "Clear/Off" to cancel any other settings or programs already in progress.


Select a new cooking program and then select "Cook Time." Make a time selection and press the "Start/Pause" pad to begin cooking.

yes there is a fuse behind the control panel area. where the cord goes inside the unit there is a fuse bloack and a 20 amp fuse ...may have lucked out and just need to replace fuse...unfortunately you have to do some disassembly to get to it ...good luck to you

try pluging it in on another outlet with an extension cord must be a diffent cerciut breaker if it happens again the microwave has a short. if not its that breaker or outlet.

Replace fuse with slo blow from Ace Hardware. Plugged unit in, clock worked. Turned unit on and immediately blew new fuse. Will fix it with a new unit.

> We have been checking our electricity units
Not sure how you are checking but your microwave would blow fuses or trip a breaker if it was drawing more than it did since they are only ~ 50% efficient (any of them) which means a 1000 watt unit is pushing the limits of normal household circuits anyhow.
I bought two Kill-A-Watt power monitors for our two households and we are all happy with their convenience and the ability to quickly check anything that plugs into a standard US outlet and they are plenty accurate enough for us heathens.
Take a look:
Kill-A-Watt power monitor 
I didn't price-shop too much but ours came to only $14 each plus shipping of $10 US.