Heater Problem - Contractor Recommendations

[Li F.]

It seems like I may have a wiring issue in my heater. The tenant is saying that he needs to touch/twist the wire for the heater to turn up each time. 

Do you all have any contractor recommendations? And how much do you all think this will cost to fix? 

The property is in North East Philly, Zip Code is 19136

Thanks so much