I purchased a used range and after connecting the gas the oven/broiler does not heat up but the top 4 burners work fine. Is there a second connection for the oven??
Check if there is 120VAC to the oven igniter (#218 on the diagram) while the oven thermostat calls for heat.
If there is the correct voltage then the igniter has to be replaced.
If there is no proper voltage then the oven thermostat most likely is bad.
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The part number for the oven igniter is AP2020569
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The part number for the oven thermostat is AP4324689
Here are the breakdown diagrams and Replacement parts for GE RGB524PEH1WH | AppliancePartsPros.com
Gene.