1. The very first thing to do is to make sure the filter is clean. Clogged filters cause all kinds of problems the most common is icing over the refrigerant line outside.
2. The second most common problem is for gas furnaces. With the t-stat on the off position for heat and cool. Turn the fan switch to the on position, if the fan does not come on turn back to off position. There is what looks like a light switch in your attic that serves as a equipment disconnect, this switch is often times turned to off position by mistake, this will not let any of the system operate.
3. The next common problem is resetting the breaker for the a/c condensing unit. The first thing to do is to set the cool off heat to the off position on the t-stat. Then find the breaker box. You are looking for breaker in the 40 to 60 amp range. The next step is to reset the breakers. A lot of times the breaker will not appear to be tripped. You have to switch breaker all the way to the off position then reset to on, you should feel a solid click as the breaker resets. If you have a breaker that trips more than once a year chances are good you have a problem that needs to be looked at. After resetting breaker turn on system check to see if condenser is running make sure the outdoor fan is on.
4. Filters the new heavier hepa filters have caused a lot of problems. There is a simple test to see if your return air is adequate for this type filter. With the indoor fan running open the return air grill and pull the filter from the top about 4 inches out let it go if the suction from the fan snaps the filter back into the grill housing your return is to small for this type of filter. You should replace with one of the lighter filters and consider adding more return air. Your system can only move as much air as it is allowed to intake.
5. Icing of suction line at outdoor condenser. First check filter to see if it is dirty, if so clean for temporary use or replace. In order to prevent damage to condenser shut off t-stat at cool off heat position. The fan switch should be in the on position to defrost evaporator coil upstairs. Check overflow drain pan if possible to insure water is contained. Run system after an hour check condenser piping to insure that icing is not occurring. If icing is happening then shut system down and call for service. The primary cause of icing is lack of airflow. The indoor fan, dirty evaporator coil or the lack of return airflow.
6. Lack of cooling on hot days. If your system is undersized there are still things that will help a lot. First to see if unit is functioning at a reasonable rate you will need a thermometer. You will take 2 temp measurements. The first at the return air grill the second at the as close to the evaporator on the side were ducts branch out or the nearest register. The difference between the two temp measurements should be 18 to 21 degrees. If this is not the case you need service to correct this. If the temp spread is ok then look in attic and visually check duct work for leaks or gap were air can get into return system or leak from ducts. If your attic is very hot in summer make sure that soffits and whirlybirds and electric fan type exhaust systems are working.
7. If you continue to have problems or need to talk to technician give us a call or email us and we will return your call 281-855-010
Member: Better Business Bureau
Member: National Indoor Air Quality and Remediation Association
Member: Air Conditioning Contractors of America
Send mail to
email@example.com with questions or
comments about this web site.