The tag on the unit will tell you, minimum fuse size and maximum fuse size. Go wilth one in between.
In the air handler on the circuit board a 5amp fuse.
There is no reset button on a central air unit, there is a small breaker or fuse box outside next to the unit, it is possible the fuse is blown or breaker tripped.
You should never use a higher fuse rating than the wire size permits. If there were some fault in your central air that caused more current to flow than the rating of the wire, you could cause a fire.
Typically it should not be. The fuse should be located in the home fuse box with its a slot particular to itself. I take it that you are referring to central air.
Cold enough for penguins to breed.
Yes, and you should use a time delay fuse.
If your central air will not come on, you may want to check your thermostat battery and your fuse box. If this doesn't solve the problem, an HVAC repair service can help.
The central air fan may not be working due to a faulty motor, a blown fuse, a tripped circuit breaker, or a malfunctioning thermostat.
from seeing your ugly face
Using a fast blow fuse in a central air unit is generally not recommended, as these fuses are designed to blow quickly in response to a sudden surge of current. Central air units typically require a slow-blow or time-delay fuse, which can tolerate temporary overloads without blowing. This allows the unit to handle the normal inrush current when starting up. Always consult the manufacturer's specifications or a qualified technician for the appropriate fuse type.
depends on run load amps. on the outside condenser it will tell you on the spec plate max size fuse.
Fuse 21 is the central locking & interior light fuse.