Obtained a copy of another companies invoice, this satisfied Comfort Expertsfree second opinion. Diagnostic discovered - Failed EEV - thermostat gave multiple codes - 184.07, 166.00. Trane error code 184.07 indicates a communication issue between the indoor and outdoor units of your HVAC system. This often stems from soft lockout. Trane error code 166.00 typically indicates a problem with the outdoor unit's communication board, often related to a low superheat condition. This can be caused by issues with the EEV (Electronic Expansion Valve), wiring, or the communication board itself. Putting refrigerant gauges on and watching the superheat increase while psucyion ressure drops forces the system to lock out. Indoor code - ALERT 1 EEV SYSTEM ERROR - EEV is stuck closed. Voltage is appled to the solenoid coil which moves a valve body - The main housing of the EEV, typically made of stainless steel, containing the needle valve mechanism. I've power cycled, inspected wiring, inspecte