- 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.
Multiple problems. Eliminate thermostat first. Remove face from wall and turn on breaker. If fan still runs you have a bad board or bad relay. If fan outside is running compressor should be too. These operate on same contactor. Verify you are getting 24 volts to coil side of contactor. If odf stops working and contactor remains pulled in you have a bad motor. If odf motor stops working the compressor will shut off due to overheating.
It is possible that it is the Thermostat but more likely the heat source the thermostat is connected to. Set the thermostat to heat to as high as it can go. If the heat source does not come on in a few minutes you likely have a problem at the heater which may be a simple loose or burnt connection in the wiring or something more serious.
Running the equipment on 72 degrees would cause the compressor and fan to work harder on hot days. This will definitely place more strain on your capacitor. These capacitor problems usually happen on the hottest days. I would suspect the capacitor, not the fan. I'm an HVAC tech, so I would Check both with my multimeter
Hello Sounds like the condensor fan motor is going bad.If the fan stops turning or is not turning at full speed, the compressor can not give off heat to the condensor.Which will cause it to shut down on high heat.
So i would start with a new fan motor.Your local heating and cooling supply house should have these in stock.
Please check the thermostta first. Take the thermostat to the air handler and hook up on a short thermostat leash. The unit should work properly, then its for sure that the problem is going to be in your thermostat wiring. If problem persists then we are troubleshooting a thermostat.
Let us know if you need further assistance.
Thanks for contacting Fixya.com
It sounds like the thermostat is wired improperly. One quick was to check is by finding breaker to unit and shutting off power. Go to thermostat and remove from wall take all wires off thermostat besides wire going to R(might be RcandRh) and C(which is common) Tape all bare wires removed with electrical tape. Now go back to the breaker and turn power back on. Nothing should be running at all. Take a voltage meter and measure the voltage from R to W(which is heating). If you read 24V then the thermostat is open and not calling for heat. Now turn the thermostat up so it is calling for heat. You should read 0V from R to W. If this checks out your thermostat is probally fine. You can check the fan the same way by going from R to G. In auto you shoul read 24V from R to G and in th on postion you will read 0V from R to G. If the thermostat checks out then the problem is probably at the furnace or rooftop. Either with the thermostat wiring or the main board acting up
Sometimes the thermostat can have a burnt place in the fan contacts. This stops the interior fan motor because the compressor wiring is not interconnected to the interior fan. The compressor command is the yellow wire. The interior fan command arrives from the thermostat on the green wire. Check the green wire for delivering 24 volts AC to the fan relay.
During heat, the heat is electrically interconnected with the interior fan. Thus, if the thermostat is bad, the fan will work properly during heating. I know July is a bad time to turn the heat on, but this is a method to see if the interior fan works properly and is not getting the proper command during cooling.