Tech Tips
Freezing of Suction Line
FI0131

• Low Airflow
• undersized duct, return and/or supply
• improperly installed duct, return and/or supply
• dirty air filter
• blower turning incorrect direction
• air filter with excessive resistance to air flow
• closed or blocked supply or return registers
• more than one filter installed

• Low Load
• low return air temperature
• dirty or matted indoor coil
• recirculation of supply air into return air
• Unit Low of Refrigerant
• Restriction
• Unit Extremely Overcharged