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Hello, causes of no light on the controller could be a bad controller or a broken wire leading to the controller.
Take a photo of the wiring diagram glued to the inside of the water heater wiring connections box, that also shows the module wiring, and attach it here using the paper clip icon at the right end of your dialog box and I will mark it up with trouble shooting instructions.
Meantime tell me what voltage read you got when you checked the voltage and what device specifically you used to do it.
We can go from there