At Central City Air, we install and service residential air conditioning and heating. We do not, however, wish to waste your money! If you are having trouble with your heating or cooling system, first take a look at this list of simple, safe do-it-yourself diagnostic procedures. They may save you a service call. If not, call us at 713-861-1977, and count on our usual prompt, courteous, and skilled service technicians to get your system working again. (One other point…after you call. If you are having any problems, please turn off your cooling equipment preferably 4 hours before our arrival.

If you sense a change in airflow, a dirty air filter is the most likely cause. Inspect the air filter to make sure it isn’t impacted with dust or debris.

Another common cause of insufficient airflow is a blocked return-air or supply-air grille. Be sure that the grilles are not covered by furniture or other items.

Some systems may require adjustment of the blower speed for proper airflow at the beginning of the cooling season. Have your Central City Air serviceman perform this adjustment. The slower blower speed, used for heating, may cause icing on the indoor (evaporator) coil and insufficient air distribution to the living area for cooling system operation. These conditions will cause damage to the cooling system. It is very important that blowers are re-adjusted at the beginning of each heating and each cooling season.

If your cooling system fails to operate, follow these step-by-step instructions, and proceed only to the next step if the system fails to start.

• Check that your room thermostat temperature selector is set below house temperature, and system switch is in the cool position.
• Is the outdoor unit power supply switched on?
• Is the furnace power supply on? The furnace provides low voltage power for thermostat operation.
• Check the house fuse box for a blown fuse or tripped circuit breaker.

If the system still does not operate, please call Central City Air for assistance.

If your furnace fails to operate, follow these step-by-step instructions, and proceed only to the next step if the furnace fails to start.

• Check that your room thermostat temperature selector is set above house temperature, and the system switch is in the heat position (heating/cooling thermostat).
• On electric ignition units, turn room thermostat off, then back on to reset the ignition control.
• Is the unit power supply switch on? The power supply switch is often mounted on or near the unit.
• Check the house fuse box for a blown fuse or tripped circuit breaker.
• Check the blower access panel. It must be firmly in place for the unit to operate.
• Check the air filter. An extremely dirty air filter can cause furnace safety controls to shut down the system.