Head pressure rises while a clean condenser's fan turns well below commanded speed. Which circuit and airflow components should be checked?
- AAdd more refrigerant
- Fan circuit and airflow components
- CEvaporator drain only
- DThermostat batteries only for the described HVAC equipment and measured operating conditions
Why B is correct
The best answer is: Fan circuit and airflow components. Insufficient condenser airflow reduces heat rejection and raises pressure. Electrical and mechanical fan diagnosis should precede any charge adjustment. The transferred operating condition requires the same design, installation, diagnostic, or safety principle in a different HVAC context. The other choices skip a prerequisite, conflict with the listed procedure, or treat a symptom without controlling its cause.