Customer Questions and Answers for Inverter by Whirlpool

Hello Jim. Touch communication. 1. Unplug microwave oven or disconnect power. 2. Check the communications cable from UIB to the touch panel. 3. Replace all parts and panels before operating. 4. Plug in microwave oven or reconnect power. 5. If problem persists, unplug microwave oven or disconnect power. 6. Replace the door control assembly. 7. Replace all parts and panels before operating. 8. Plug in microwave oven or reconnect power.

Jerel, To properly assist you we will need your model number to help you with this. Please post your model number with a new question on the parts page. http://www.appliancepartspros.com/modelnumber_locator.aspx

Jeff, Based on the problem description with no response from keypads and the display jumping around the issue would most likely be in the User interface board WPW10391280.

Hello Rockeye. Power to magnetron interrupted. 1. Unplug microwave oven or disconnect power. 2. After 40 seconds, check to see whether this solves the problem. 3. Unplug microwave oven or disconnect power. 4. Check cooling fan operation 5. Check the magnetron. 6. Check P65 connection on the relay control board. 7. Check the P56/P66 connection between relay board and relay control board. 8. Check wiring to the 1200W inverter and control system. See “Checking Inverters.” 9. Check operation of all interlock switches. 10. Replace all parts and panels before operating. 11. Plug in microwave oven or reconnect power. 12. Check voltage at 4903-1 on relay board. If it is 120, unplug microwave oven or disconnect power. 13. Replace inverter. 14. Replace all parts and panels before operating. 15. Plug in microwave oven or reconnect power. 16. If problem persists, unplug microwave oven or disconnect power. 17. Replace relay control board. 18. Replace all parts and panels before operating. 19. Plug in microwave oven or reconnect power. 20. If problem persists, unplug microwave oven or disconnect power. 21. Check for reversed plug connection on controls or loose wiring. 22. Replace all parts and panels before operating. 23. Plug in microwave oven or reconnect power.

Hello Jim. 1. Unplug oven or disconnect power. 2. Remove the oven from its mounting location and pull it forward so that you can access the top cover. 3. Remove the four screws from the top cover and remove the cover. 4. Remove the eight screws from the inner cover and remove the cover. 5. Remove the ten screws from the upper rear cover of the oven and remove the cover. 6. To remove the magnetron fan motor: a) Remove the left screw from the appliance manager board bracket. b) Remove the magnetron fan motor housing screw from the rear of the chassis. c) Remove the magnetron fan motor housing assembly and set it on top of the oven. d) Disconnect the two black wires from the magnetron fan motor terminals. e) Remove the three screws from the magnetron fan motor housing and separate the sections. f) Remove the magnetron fan motor screws from the housing and remove the motor from the housing. g) Pull the blower off the magnetron fan motor shaft. 7. To remove the inverter: a) Remove the two top screws from the outer convection cover at the rear of the oven. b) Remove the two inverter housing screws from the rear of the oven. c) IMPORTANT: Touch a screwdriver shaft to the two filament connectors and chassis ground. d) Disconnect the two filament wires from the magnetron terminals. e) Remove the screw from the green/yellow ground wire. f) Lift the inverter housing and set it on top of the oven. g) Remove the wires from the inverter housing. h) Unclip the four housing tabs and lift the top housing off the bottom half. i) Disconnect the wires from the inverter as follows: 2 red wires from CN703 Screw at green/yellow wire E701 3-wire connector at CN701 Blue and white wires at CN702 j) Unhook the two locking tabs and remove the inverter from the lower half of the housing.