Through-the-Wall A/C Unit FAQs

Click here to view all through-the-wall installation and operation manuals found in our Consumer Product Resource Library. 

The through-the-wall product category and manual type have already been selected, so you can search by your specific model type.  

You should have a licensed electrician look at the outlet. It is an indication of not having the correct voltage to operate the unit. Never alter the plug on the unit. Please refer to the installation and operation manual to verify the correct plug style and voltage prior to selecting a unit.

Click here to view all through-the-wall installation and operation manuals found in our Consumer Product Resource Library. 

The through-the-wall product category and manual type have already been selected, so you can search by your specific model type.  

The sleeve should be level side to side but should have a slope from front to back, normally 3/8" is sufficient. See your Installation and Operation Manual for details or consult a licensed HVAC installer for concerns.

These openings should never be covered, they are a way for the unit to breath and work as it is designed to do efficiently.

Yes, all standard window and through-the-wall A/C units come with the plug attached to the unit at the factory.

No, while the trim ring is included with the product, the trim ring is a decorative cover and not required for installation. 

You can reset your check filter light by pressing the following buttons based on your product line:

Kühl & WallMaster models - press FAN and SPEED buttons at the same time

Chill Premier & Uni-Fit models - press the FILTER button

The "MODE" button lets you select the mode of operation on your Kühl or WallMaster AC unit. On Cool only models, the "MODE" button cycles between COOL or FAN ONLY.  On Heat/Cool models, the "MODE" button cycles between AUTO (heat or cool depending on set point), HEAT, COOL, or FAN ONLY. 

For optimal performance, it's best to clean the filters every 2-3 weeks, depending on how frequently it's used. Once you've cleaned the air filter a few times you will get a better idea of how much dirt is collected in the filter and you can adjust the schedule, as needed.

The Limited Manufacturer's Warranty includes parts and labor covered from any manufacturer defect for the first year from the date of purchase. The 2nd through 5th year of the limited warranty the sealed refrigeration system is still covered from manufacturer defect, and is just required to obtain a servicer's report or diagnosis stating that the unit has an issue related to the refrigerant system.

1. The unit must be purchased from an authorized Friedrich dealer.
2. A service report from a certified technician stating the issue is a result of a manufacturer defect.

Icing can be caused by a number of factors. Units that have not been cleaned over a long period of time may have coils and fins clogged by dust, dirt or debris. Clogged coils and fins restrict air flow through the unit, which can cause the compressor to work even harder – so hard, that it may reduce the coil temperature below the normal range in an attempt to make up for the lost cooling power from the blocked coils. Another potential cause is running a unit with a very cold set point (i.e. turning the target temperature down very low) on low fan speed for an extended period of time. This can cause excess condensate to build up on the coils, further lowering the temperature of the coil and leading to icing. It may be helpful to ask an authorized warranty servicer to check the unit for you.

Water leaking into the room is generally caused by either the unit sitting level in the window or the unit needing to be cleaned. Water collects in the front of the unit and then travels to the back where the slinger ring will toss it against the coils in the back and then the water evaporates. If the unit does not have the proper slope from front to back, then the water will leak out the front. Another possibility is dirt or debris clogging the interior of the unit and restricting water from flowing to the back, causing it to leak out the front. Having your unit cleaned will solve this problem. If you feel that neither of these conditions exist then you need to make sure that there is no air leaking in from the outside around the unit anywhere. Leaking air will cause condensation to form on the outside of the unit which will leak into your room. If there are any air leaks you will need to reseal these areas.