Heat exchangers can develop cracks with age. If they exist, there is a risk of serious illness from toxic fumes emitted.
Dirty air filters restrict airflow and cause system to work harder, resulting in higher energy costs, less efficient heating, and possible malfunction.
Dirty burners can cause poor combustion.
A defective thermocouple or flame sensor will cause the furnace to shut down.
A fan switch that is not properly adjusted can waste energy or cause nuisance fan cycling.
Some pilot light tubes have automatic shut-offs if the flame goes out, but not all of them do, so each and every pilot light in the home should be routinely checked to make sure it is always on.
Defective safety controls are an integral part of your system and prevent damage to the main components in case of a malfunction.
Dirty blower wheels reduce airflow, causing longer operating time and increased cost. This problem can lead to lost comfort and compressor failure.
Blocked or restricted combustion air openings can be dangerous.
Flue pipe corrosions or leaks are dangerous.
Loose panels can be noisy, increase operating cost, and become a safety issue.
Worn contacts and loose wire connections can lead to a motor or compressor failure.
The thermostat not only controls the temperature in the home, but
controls the cycle rate of your equipment. If your thermostat is faulty, it will affect your comfort and cause extended or shortened cycle runs – costing more energy dollars and possibly damaging components of your system.
The degree of temperature rise is critical for proper heating temperature; if it is too high it could possibly damage your heat exchanger.
The bearings on an inducer motor may wear over time with the ranges of heat it is exposed to. A bad inducer motor will cause your furnace to shut down.
A reversing valve or heat strips that are not operating correctly can waste energy and cause heat loss.