On a new install,a 5 ton 21 SEER condenser model (24ANA1). Modified the condenser to work with a 2 stage thermostat instead of the Carrier Infinity t-stat .The Unit documentation clearly states that the Infinity control thermostat can only be used,but this is for a control guys house and wants to run off of his Siemens control system. The problem that exists is that the ECM condenser fan motor runs at high speed instead of ramping, and the error code light constently displays an error. Help!?