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The customer says that she does not get heat from the unit regardless if it’s in microwave or convention
But the unit dose have power

Model Number
Jvm1790sk 01
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Hi. I have attached a service manual on a similar unit. I couldn’t find one for your exact unit. At this point I think you have a low voltage issue since you cant get any heat on either setting. This means it could be the control board, door switches, or Bi metal thermostats. I would take an amp draw while running a cycle to see how many amps you are getting. The manual has diagnostic flow charts on the last pages that will be helpful to you.

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