Question about LG LWHD2500ER Wall/Window Air Conditioner

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I just purchased a new 2500er unit. the rear of the unit is 12 inch away from the adjecent building. the unit turns off completely. there seems to be a sensor that turns off the unit when there is excessive back pressure. is there any way to by-pass it? thanks. mike.

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Hi Mike, what is happening is the unit is shutting off on high head pressure as the air that the condenser fan pulls across the outdoor coil is apparently being restricted by this building. You can't very well move the building to make it work. Normally, 12" would be enough room, but not in your case. You can look on the schematics and locate the high pressure switch. Its just a very simple switch that has a wire in and the same wire out. The switch is a single pole switch opens the contacts on high head pressure. Even though you don't have a high head problem, the switch is getting the blow back from the building causing it to shut down. The switch in the schematics will say HPS . The wire should be red in color and there will be 2 wires, but its the same wire. Goes in and out at the top. It will be brazed to a smaller copper line. The low pressure switch will look the same, but will have blue wires coming out the top. The voltage should be 24 volts. Unplug unit, find the switch, cut the wires leaving enough to reconnect if you need to in the future. Strip the insulation from both ends of the wire and tie it together, using **** splices or wire nuts. The unit will now stay running. Just wash this coil outside once a year to keep it clean. This is the way to by-pass it. Your only other option is to move the unit or have a transition duct made and mounted to the back at a 90 degree angle. I don't believe you will have enough room to put one on with only 12" to work with. You can see the switch from outside on one of the high pressure lines, getting to it will be difficult. I know its new, but to get to it you may have to use sheet metal cutters to make a square to reach it and cut a piece to screw back over it. We do this in the field when needed. Please keep me posted on this and don't forget to rate me. Please be kind when doing so, as I know you will. Let me know the out come. Thanks for contacting
A/C, Heating, & Refrigeration Contractor

Posted on Jul 14, 2010

Testimonial: "Thanks i appreciate the support :-)"

  • Robert Horton
    Robert Horton Jul 15, 2010

    Thank you for the outstanding rating, I am here to help you.



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