Turn the range breakers in your electrical panel off, then back on again. If this does'nt restore proper operation, you'll need to test for 240 volts a.c. at the power cord terminal block behind the rear cover panel. If the proper voltage is not present, you'll need to find out why. It will most likely be a damaged breaker or a burned power cord.
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this is a simple unit, it dose not have a control board ar for that matter any other comples parts. it has a supply power 220V combined but none of the bruners will heat up more than room timp. Changing the thermo was no help.
The only reason I know for the problem you describe is the loss of one of the 110 volt
power wires. If it is'nt showing up at the power cord terminal block, it must be somewhere on the other side in the circuitry.