When I turn on the heater, there is a loud clicking coming from the unit, hardly any air blowing, and there is arcing from the connectors inside the init. Can anyone lead me toward a potential solution?
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If your thermostat is working on the Heat cycle (listen for "click" when turned up and down on Heat), then your heating coil assembly is probably bad. The heating coil is in series with a Fusible Link and a Bi-metal thermostat, if any of these three fails, there will be no heat from the coils.The Link and Bi-metal Thermostat are made up as part of the heater coil assembly.
The fan that blows the air blows through the heater coils before it blows through the A/C.As long as the heater doesn't come on, there is not much that can be done. ZCooking the attic room will be a problem because it is the heat rises thing, and on top(literally) of it all, the roof is radiating heat.
It sounds like you might have a spark igniter on the unit that is being told to relight the burners. This is probably the tstat as this is the only control that "tells" the unit to come on. There isn't anything else internally that will cause this problem. Replace your tstat and I bet this solves your problem.
It is probably the compressor. You will need to check if the compressor is being called to come on. Do you hear the compressor running? If you do, I would remove the unit from the wall or window, and wash it down real good with a hose being careful not to get the electronics wet. If not and the unit sound different than it did before, it's probably time to buy a new one.