My Blower Turns itself on when it is not supposed to.
I have a Ruud 14 Seer AC and air handler that was installed in September 2006. My home has baseboard heating. Since the system was installed, the air handler comes on by itself, with the heat on or even with the thermostat set to off. I have had numerous service calls and various parts have been replaced including the thermostat and the circuit board, but this problem keep happening and it results in cold outside air blowing through my house when it is cold outside. The AC compressor never comes on, just the blower turns on. No one has been able to help. Has anyone heard of this and is there any solution? I am almost ready to just rip the whole system out I am getting so frustrated!
Re: My Blower Turns itself on when it is not supposed to.
If your indoor unit is located in the attic, you may be experiencing the result of a high temperature safety device (possibly too sensitive) that is responding to warm air drifting up the return air duct. The function of this device is to turn on the fan at a given set point and cool the unit back down. Have someone identify your limit rating and change the limit device with one rated the same or see if the maker of the unit has an upgrade/service bulletin on this fault.
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You can find the tonnage in the model number which increases by increments of 12, so if the model number is 24 =2 tons. Model number on your a/handler is 17. Thats a ton and a half. Really should match the evap and condenser for the best efficiency. ...
The air 'handler' is nothing more than a type of fan turned by a motor.
The condenser however is a sealed, closed system with coolant that will need to be properly removed (EPA stuff). The condenser must be installed with care, recharged, then checked for leaks.
There is far more involved than replacing an air mover.
I do most of my repairs myself but sealed systems that must be charged is something I leave up to a pro.
Absolutely, however, you want to properly diagnose the reason why the fan is not running. It could be a less expensive part than the fan motor itself.
First, check to see if you have the proper voltage going to the motor. I believe your motor requires 240volts ac. If you do not have 240 volts, you have a control problem.......either the thermostat is failing to close R & G or your blower relay may have failed to close the contacts necessary for your fan to operate.
If you have the voltage, then you want try spinning the blower wheel with your hand. Does it spin freely? Is the motor warm/hot? If so, turn everything off for an hour or so. As soon as your energize it, try spinning the motor with your hand again.....if it spins freely with no resistance and then starts running by itself, the problem is the run capacitor (approx $20.00 depending on where you purchase it from). If there is resistance when you try to spin it, the problem is most likely with the bearings and you will need to replace the motor.......if you have to replace the motor, go ahead and replace the capacitor also, making sure it is properly "matched" with your new motor.
I hope you find this to be very helpful to you, moving forward. :-)
1. often there is a central return in the house. This is the place where the air gets pulled back to the unit and is likely very close to your thermostat. Check for a filtered louvered grill there and see if your filter is located here. If so, you can access the filter by opening the filter frame with a screwdriver or even a coin.
2. Otherwise I would expect that your filter is on the return-air side of your air handler (where the blower is) Older models have the filter actually inside the air handler in the blower compartment. Newer models may have a small separate filter door. I'd look in these areas.