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Hello, there could be a few reasons for this. A condensate safety switch may be tripped due to a clogged condensate line, this will involve cleaning the line with a wet/dry vac.
No power to the thermostat due to a burned out transformer or fuse
Dead batteries if the thermostat uses batteries
Hello, sometimes this happens when the condensate overflow switch trips duento a clogged condensate line. You need to find the outlet of the condensate pipe and use a wet/dry vac to clean it out. The pipe will be 3/4 inch PVC. Let me know what you find. If the drain is clear then the problem could be related to a burned out transformer or dead batteries if the thermostat uses batteries.
Either you blew the fuse on the air handler control board or you burnt out the air handler transformer.
The thing that blew the fuse is probably the contactor in the condenser unit. You will need to check out out cause of the outage before replacing the fuse or transformer.
What you have is a 24v control circuit problem. There is a transformer in the air handler ( inside unit ) you will have 220v on the one side and 24v on the other. If you have 24v from transform there is a small fuse on the pc board that could blow during power problems. On the inside cover you should find a wiring diagram.
Sounds like you either blew a transformer, have a bad circuit breaker or blew the main fuse in the outside disconnect. If the indoor unit is still blowing air (no matter what temperature) start looking at the power supply to the outdoor unit. From the circuit breaker, the power will go to a small box located within a few feet from the outside unit. This box will have either a lever on the side or you will be able to open the box and pull out the fuses. From this box the power goes to the condensor. The first thing you should do is to turn off the breaker to the outside unit. Flip it back on and if you have a call for cooling, after about 3 minutes the outdoor unit should start. If it does not, shut off power again to the unit by switching off the breaker, go outside and pull out the fuses in the disconnect box. Using a multi meter, check for continuity thru the fuses. If you have continuity, call your technician. If one or both fuses show no sign of continuity, replace the fuse(s).
Make sure that the thermostat is working and sending a signal to the indoor air handler. You may be able to check this by turning the fan switch to "Fan" and see if the blower turns on. You may just have a bad thermostst.
Caution should be used anytime you are near electrical components. If you do not have the skill-set required to test electrical equipment, leave it to a proffessional.