<!-- from fixya rte -->Why my central a/c unit wont blow hot air - Heating & Cooling

Felizardo Erilla

• 241 Answers
• Posted on Jan 12, 2008

SOURCE: 20 year old central a/c heater not working

Check your thermostat and mode selector setting, thermostat setting should be set at warmer and mode selector setting should be at low heat or hight this is applicable for manual unit.
If it is a remote control just set the remote to heat mode.

sample only

SOURCE: wont no water to empty or drain

Either the unit is really dirty or it is low on refrigerant. A unit tha is low on refrigerant will start off cold and withing a few minutes, start warming up. If you aren't seeing any water its because of one or both causes listed.

SOURCE: my a/c system is blowing hot air; outside fan is not engaging

First check for line voltage 240v...if thats good .check for burnt wiring at fan capacitor.if you hear the compressor humming but still no fan you may need a fan motor.. when buying your new motor make sure to match horsepower and r.p.m

SOURCE: central air blowing warm air

2 things could be happening. 1, inside unit needs filter changed and coil cleaned. 2, unit is low on freon. A/C tech should be able to check for both. You can check the a/c coil to clean it yourself but to check for low freon this will have to be done by a a/c tech due to the complexity of the system. the ice is caused by a series of things however, check the a/c filter and the coil located behind the filter. this coil should be free of any debris. if you have indoor pets sometimes the hair clogs the coil causing the freeze up.. To clean the coil you need to get a small weed killing sprayer.. At the a/c supply house you can purchase cleaning solution that is easy to use an safe for the enviroment also leaves your house smelling great. if the coil inside has been cleaned check to see if the coil outside is clean if not you can clean it with a water hose by spraying the coils out. MAKE SURE TO KILL THE POWER beforehand. Also spry the water onto the coils only and spray in the oppisite direction of air flow. Have system checked by a/c tech if you do not feel comfortable doing any of these suggestions

Sergio Shamshoian

• 102 Answers
• Posted on Dec 04, 2009

SOURCE: my ptac is not blowing hot air only blows warm air

freon is low or outside is very cold