I recently had a heating coil installed to an existing forced air system in a customer's home. The problem is when the plumber piped it in, he left the zone valve open and the controls were not yet wired. This caused the unit to call for heat continuously and simultaneously with the obvious call for a.c., as the temperatures were well into the 80's. This mistake was not realized until the condenser started making a grinding noise. With the problem corrected the condenser seems to be running fine. Has this happened to anyone before, and was there permanent damage to the condenser or the heating coil?