Hi,Welcome to Just Answer, My name isXXXXX will be helping you with your appliance issue today.
That's not good, the control has failed, the only way to repair this is to replace the clock assembly you model number is XXXXX it should be more numbers to it if you get me dollars will get you the correct clock part number thanks, Bryan
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Okay your part number is,(NNN) NNN-NNNNand you can order this at this blue link,
http://www.searspartsdirect.com/partsdirect/part-number /Whirlpool-Parts/Wall-oven-Parts/8302967/0022/664/Model-RBD305PDT12/1198/0125300?keySuffixId=NA&productTypeId=x&searchModelNumber=RBD305PDT12&subCompDesc=Control%20panel&brandDesc=WHIRLPOOL&modelDesc=ELECTRIC-OVEN&blt=11 unfortunately it's the only fix for your issue, thanks and well wishes, Bryan