No cool in Auburn. Found unit was frozen from a failed bypass damper and dirty filter. Also found no water safety on the primary drain line. Changed filter and started system. When both zones are calling, the system pressures and temperatures are okay, but when only one zone is calling the suction side pressure and temperature falls to freezing temperatures. Recommend replacing 12†bypass and adding water safety to prevent future water damage from a clogged drain line. System a pound low on refrigerant 410a. Corrected charge.