A common error our customers see on their AC units is an E1 error, which occurs when the unit is under high pressure.
Most high pressure errors are a result of improper duct-work, so the first step to getting back on track is to check over your ducts. In the video below, our technician will walk you through the process of fixing your HSC-14 or HSC-18 unit.
Transcript: This is a demonstration of our model units that are at range from 1 ton, and they also have the same error message as up to our 7 tons in this style of unit. It’s an E1 error, which tells us it’s high pressure, so that tells us something’s constricted which is driving the temperature of the coils up.
The most common error for high pressure alarms usually stems from the ductwork. So if a customer does their own install, we try to ask to make sure the ductwork has less turns and is as straight as possible to allow ample exhaust to get rid of most of the heat that’s available. So sometimes what happens is it may have to go out a window. So, if the unit’s sitting right here and you’re ducting right out a window going to a straight 90 degree, (this run could end up being longer, could be up to 25 feet) it’s making the blower work harder and it’s going to struggle to get rid of the heat faster. So it’ll trigger an E1 alarm, which is high pressure. So once we straighten out the ductwork and restart the unit, this should go back to normal operation again.
The filters themselves can become clogged. You got the evaporator side filter and you got the condenser side filter–both of them can lead to your high pressure alarms. So what I recommend, if you have a way of using an air compressor to blow them out, or a hose to hose them out, it works just as fine and to be able to put them back in there, and most of the time it will also stop an E1 alert.