Tech Tips
Tripping High Pressure Switch
(Heating Mode)
- 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 ( units equipped with belt drive blowers)
- improperly adjusted blower drive package (unit equipped with belt drive blowers)
- closed supply air registers
- blocked return grill
- Refrigerant overcharge
- Non-condensables in refrigerant
- Bad indoor blower motor/bad motor capacitor
- Unit not terminating defrost
- Bad pressure switch
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