Too many possibilities to know cause, but a simple Google search for Comfort zone cz1500p manual yielded this link: http://www.northerntool.com/images/downloads/manuals/700155.pdf
Check the Troubleshooting section.
I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881
Comfort Zone heaters do not have a display board, they
only had thermostat knobs.
Is it possible that you have a different model of heater?
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