Very often I see a taped blower door safety switch.
This is an important switch! It is there for a reason!
The blower door safety switch turns off the furnace operation should the lower protective door be removed.
In some units that cover has to be removed to be able to change or clean the air filter. Hence the need for a safety switch.
This is so that one cannot be harmed by the blower fan blades should a hand be stuck inside the unit for some reason. Those fan blades are turning very fast and can literally cut finger tips off!
There is a reason for the word SAFETY in the term "blower door safety switch."
But also, this is a switch!
It is electric!
One shouldn't be fooling with an electric device for any reason. Even though it is plastic and hopefully not electrically "hot" to the touch, care should be taken when dealing with it.
And certainly, CERTAINLY, if it needs to be taped temporarily for some reason, you shouldn't use aluminum tape! Aluminum is, well, conductive of electricity!
If there is any electrical problem one has to wonder if that aluminum tape could create a dangerous condition, conducting electricity to the cover panel on the front of the unit!
Wouldn't the home inspector love THAT if he goes to check the filter inside the unit?
Removing the cover is also a good way to check to make sure the safety switch is operating properly, and turning off the blower. Sometimes they get stuck.
My recommendation: leave alterations to the HVAC unit to the professionals who know what they are doing! Homeowners have no reason to do something like this! And surely it should not be found by the next person opening the panel. Who knows what might happen to somebody.
Jay Markanich Real Estate Inspections, LLC
Based in Bristow, serving all of Northern Virginia.
Office (703) 330-6388 Cell (703) 585-7560