Chapter 14

Warning Signs: When to Call for Service

Some symptoms can be checked safely; others require prompt professional attention. If the system runs but the home does not cool, first confirm the thermostat is set to cooling, the temperature setting is below the current room temperature, and the filter and visible supply/return grilles are not blocked. If these simple checks do not explain the problem, arrange service.

Call a technician if you notice weak airflow, repeated icing, water leaking from the indoor unit, persistent musty odors, unusual grinding or buzzing, frequent cycling, a sudden unexplained increase in energy use, or a system that repeatedly shuts down.

If you see smoke, sparks, burning electrical odors, or a damaged electrical component, keep clear and seek appropriate emergency or electrical assistance. Do not open equipment panels. If a breaker trips repeatedly, do not keep resetting it; repeated trips indicate a fault that needs diagnosis.

If refrigerant lines or coils appear damaged, do not touch them. Refrigerant can cause injury, and repairs require specialized equipment and appropriate certification. Do not attempt to locate leaks with a flame or add refrigerant from a consumer kit.

If water is actively damaging ceilings, walls, or floors, shut the system off if you can do so safely and contact a professional. Protect people and property first. Never enter standing water around electrical equipment.