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Before you call for service

Why you should turn off the system: An iced over coil means we cannot service the system.

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.

Why you should turn off the system: An iced over coil means we cannot service the system. click for larger view


Insufficient Airflow

If you sense a change in airflow, a dirty air filter is the most likely cause. Inspect the air filter, following the procedures in the General Maintenance section. 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. Systems with belt drive blowers require adjustment of the blower motor pulley to set 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 belt drive blowers be re-adjusted at the beginning of each heating and each cooling season.


Cooling system fails to operate

High Pressure Switch: Location differs depending on brand and model. Check your owner's manual for exact location.

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 your unit has a high-pressure switch, shut off power to the unit. Remove access panel to compressor compartment (or control box cover on HS18 units). The high-pressure switch will normally be located on the outdoor coil piping. Push button on switch to reset. Do not push reset button more than twice. Replace access panel and restore power to unit.
  • If the system still does not operate, please call Central City Air for assistance

High Pressure Switch: Location differs depending on brand and model. Check your owner's manual for exact location. click for larger view


Furnace fails to operate

If your furnace does not appear to be performing properly, or does not operate at all, it may save the cost of an unscheduled service call if you check a few conditions yourself, before calling for service. 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.

Location differs depending on brand and model. Check your owner's manual for exact location.
  • 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.
  • Check to be sure that the manual shut-off valve in the gas supply pipe leading to your furnace is in the open position. The valve is open if the lever points in the same direction the pipe runs, and it is closed if the lever is at a right angle to the pipe. If the valve is closed, (check and make sure gas is not turned off for safety reasons before proceeding)open it then follow the startup procedures.

Location differs depending on brand and model. Check your owner's manual for exact location. click for larger view

Note: Before proceeding to the next step, turn OFF the electrical power supply to your furnace, and remove burner access panel

  • Is the internal manual shutoff valve open? (Electronic ignition units only).
  • Check the manual knob on the gas valve to be sure that it is in the ON position.
  • If you have a standing pilot furnace, visually check the pilot flame. If the pilot is not lit, follow the startup procedures.
  • If the system still does not operate, please call Central City Air for assistance