Oven will not heat up

To be honest, it sounds like you purchased a secondhand, faulty appliance. Although it might be loose connections due to the move, the most likely issue would be the main board and due to the price of them, that is often a good enough reason to buy a new stove.

https://www.google.com/search?q=Whirlpool+gr478lxpq1+stove

Error messages are normally searchable, but not that one. Take it back or call out a Whirlpool Service engineer to diagnose, fix and set it up. It is a sorry tale and not an easy one to fix.

https://www.google.com/search?q=Whirlpool+gr478lxpq1+stove+AM71+UI42EEWET+107

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Display on maytag oven 8114p471-60 went blank - Fixya

www.fixya.com/.../t16018814-display_maytag_oven_8114p471_60_we...

Jan 20, 2013 - Stove top electric ignition still works fine, so there is power going to the .... maytag cwe4800acb oven shuts off and display goes blank during .

Both the top and bottom oven will only work if a time (any time) has been set on the clock. Setting the time operates a contact to switch the power through. The only exception is the grill. This will work even if the time has not been set. So if the oven controls/lights and heating work, to me it means that the clock/timer is half working and the only thing that isn't is the display.
I haven't had the clock/timer to bits but a fellow blogger has said that in some timers there is an electrolytic capacitor that controls the display. When this fails as they are renowned for doing, the dispaly mal functions. If there is one then Maplin have some - VHR41W/43W and DT64U depending on value etc. Let us know how you get on.
If you need a new clock/timer they are around £80 from espares.

check and test power input may have lost a feed line or problem with circuit bound --

THERE IS A PROBLE WITH THE ERC (CLOCK) NOT TO SURE IF I WOULD USE IT EITHER. THE PART IS EASY TO CHANGE JUST TURN POWER OFF AT THE BREAKER FIRST. YOU CAN FIND THIS PART HERE.
http://www.searspartsdirect.com/partsdirec

You must check your incoming power for 220 volts. You have lost one leg of your power. Either a bad breaker or bad wall outlet or bad range cord.

Try unplugging the oven and let sit for 10 min. This will reset the curcuit board and reboot the electronics. You may have to pull out the stove o get to the cord.

power surge,,replace board

it sounds like it burnt one of your main wires in the back of range. by turning a knob on you are getting a feed back. turn the power off remove back panel take a visual check of your wiring.

Check power going to the electronic module in back of the display. If power there you have a blown module. If no power check for a blown thermal fuze.