My central a/c will not turn on. There just seems to be no power to the entire unit. Checked fuse box in house everything okay there. Could this be a bad thermostat? What should I check before calling for service/repair?
An expert who has achieved level 2 by getting 100 points
An expert that got 5 achievements.
An expert whose answer got voted for 20 times.
An expert who has written 20 answers of more than 400 characters.
Re: Central A/C will not turn on
There is usually a small fuse inside the indoor unit(furnace or air handler). That fuse generally is located on a circuit board and looks like a car fuse. It may be amber or purple in color. This fuse may have blown. If so you may have a bad circuit board. I recommend calling a NATE certified Tech for service as this one has several possibilities. Good luck.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Hello, sounds like it is either a low charge or lack of airflow, what type of filter are you using? sometimes those filters that claim to be super effecient will actually cut down on your airflow and cause the ac to freeze up.
Generally, the fuses are located in a box outside by the outdoor unit. The box has a door on it and you will probably have to pull a cartridge out and the fuses will be behind the cartridge. If you don't have an ohm meter to check the fuses , just go to home depot, lowes or another hardware store where they can check them for you. Be sure to check the circuit breakers too.
Hi, have you checked all breakers, fuses in the disconnect box at the outdoor unit as most have them in behind the pull out off plug. Please give me more information on this and I can solve this for you. Sincerely, Shastalaker7 A/C,
Check the outside fan and make sure it rotates freely. If it doesn't spin freely it needs to be replaced. If it does spin freely then check the capacitor. If the capactitor is OK the check the fan motor windings for continuity with an ohmmeter. Let me know what you find.
Is your central air furnace or electric heat. Electric furnace sometimes have electric strip sequencer stick in the closed positions leaving on one strip of the electric heat. Get a service tech as soon as possible to check this out. Any smells from a central unit need to be teken care of promptly. TURN OFF unit you have it checked for your safety. Rus
The control panel gets its power from the central heating unit's power point. Try turning the power off outside at the powerpoint next to the ducted heating unit and try turning it on again after a few seconds, see if it resets
If the compressor turns off and won?t come back on during a very hot day, the unit may have built up a high "head" pressure and the high-pressure limit switch may have tripped. This is usually located right inside the access panel on the compressor unit. Simply push the button to return it to operation.
If your central air conditioner doesn't go on automatically:
1) Be sure the thermostat is set to "cool" and set below room temperature.
2) A central air conditioner should be on a dedicated 240-volt circuit; check the main electrical panel and any secondary circuit panels for a tripped breaker or blown fuse. If you find the problem here, reset the breaker or replace the fuse.
3) Make sure the furnace power switch is turned on and that the outdoor condenser's power switch, mounted on the outdoor unit, hasn't been shut off. Also be sure the 240-volt disconnect next to the compressor (in a metal box, usually mounted on the house wall) hasn't been shut off.
4) Turn off the power to the air conditioner and check the thermostat.
5) Remove the thermostat's cover and unscrew the wire from the Y terminal.
6) Turn the power back on.
7) Holding the wire by its insulation, touch the bare end to the R terminal and hold it there for about 2 minutes. If the compressor kicks on, the thermostat is faulty; replace it or call an air conditioning technician. If the compressor doesn't go on when you hold the two wires together, turn the power back off and call a service technician.