Problem with blower on Madison

[Silenced38]

I think the blower has a bad ground but not sure. If the blower is running and i turn on the light that is connected to the same junction box. I trips the breaker and shoots a spark from the hot water heater. The water heater is propane with no electric going to it. What i think is happening is it has a bad ground in the blower and its grounding to the stove, up the flue pipe, across the sheet metal roof, down the water heater flue and the spark jumps from there to the copper water pipe.
Ive built this house 13 years ago and have never had this issue before. I very rarely run the blower. I know this isn't actually a heater issue but i thought someone here might have a idea. thanks

 

[DAKSY]

I'd take it off the stove & bench test it or at least open it up & look at the wiring situation...
Not a big fan of sparks & gas appliances in the same area...

 

[begreen]

Check both the motor for sure but for safety sake also check the receptacle wiring to make sure it is correct. In a 3 wire receptacle with the round ground lug at the bottom, the wider left prong should be the neutral and the shorter right prong should be the hot.