Goodman Air Conditioner Error Code LS

The LS error code on a Goodman air conditioner indicates that Load Shedding has been engaged. Load shedding is a demand-response function used in utility or building management programs where the electrical utility or a building automation system sends a signal to reduce energy consumption during peak demand periods. When the LS switch closes, the Goodman unit interprets this as a command to curtail electrical load by shutting off the compressor and any electric heat strips simultaneously. The unit itself is not malfunctioning; it is responding correctly to an external control signal.

The LS switch is typically wired into the unit's control board as part of a utility load control circuit or an energy management system. When the switch is in the closed position, the control board disables the compressor contactor and electric heat relay, effectively stopping all high-draw operations. This is intentional behavior designed to help utilities balance grid demand and to allow building operators to participate in demand-response incentive programs. Ventilation functions may continue to operate depending on system configuration, but no conditioning or heating will occur while load shedding is active.

The most direct resolution is to open the LS switch, which removes the load shedding signal and restores normal unit operation. This switch may be controlled manually by a facility manager, automatically by a utility-side radio or internet-connected relay, or through a building automation system. If the unit repeatedly enters LS mode unexpectedly, the wiring to the LS switch terminals should be inspected for shorts or inadvertent connections that could be causing the switch contacts to read as closed.