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Tech Tips
Tripping High Pressure Switch
(Heating Mode)
FI0143
- Low Airflow
- undersized duct, return and/or supply
- improperly installed duct, return and/or supply
- dirty air filter
- air filter with excessive resistance to air flow
- dirty indoor coil
- incorrect blower drive package
- incorrectly adjusted blower drive package
- closed supply air registers
- blocked return grill
- System components not correctly matched
- indoor coil
- refrigerant lines
- Refrigerant overcharge
- Non-condensables in refrigerant
- Bad indoor blower motor
- Refrigerant restriction (high pressure side)
- Refrigerant lines restricted (vapor or liquid line)
- Blockage in indoor coil (indoor check valve)
- Unit not terminating defrost
- Bad pressure switch
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