The days of Monkey Boy Service Calls are over...

Click here to check out our fun short course and learn how to get the most out of Appliantology.

FAQs | Repair Videos | Academy | Newsletter | Podcast | Contact

Stay connected with us...

Samurai on Facebook - become a fan today! Sign up for our free newsletter and keep up with all things Appliantology. Subscribe to our YouTube channel for lots of appliance repair tips and help! Follow the Samurai on Twitter and get timely morsels of Appliantological Wisdom! Subscribe to our MST Radio podcast to learn secrets of the trade.
TFA303

A/C Won't Turn On - No Power to Thermostat

4 posts in this topic

HELP!!

:yikes:(Wife isn't pregnant, but my ability to reproduce may be threatened if I don't fix this...)

Subject line says it all. This is a central A/C attic unit. I've checked power to the A/C itself, circuit breaker, power out from the trasformer is 24v, all the easy stuff.

The thermo has no reading with the multimeter. Any suggestions?

TIA,

Tom

P.S. Love this site; Samurai Appliantlogy hooked me up with my dishwasher and refrigerator.

Share this post


Link to post
Share on other sites

Need appliance parts? Call 877-803-7957 now!

the outside unit is noting more than a compressor and a fan motor . what brings it on is called a contactor . the contactor is basically a big old relay that powers up the outside unit. it had tiny wires that fire this mutha up from the inside by the 24 volts . check the coil on this contactor to see if its got continuity if its open its bad. If you manually push down on the contactor and the outside unit responds then it MAY be the coil. a quick redneck temporary fix is to jam a popcycle stick in it and make the outside unit stay running, not recomended by me ,but if its hot as hell you gotta do what ya gotta do ,you know ?

 

Share this post


Link to post
Share on other sites

Many thanks, applianceman, will try that.

Tom

Share this post


Link to post
Share on other sites

The with thermostat in "Off" and "Auto" should have ~24v between red wire and any other (white, green, yellow/blue). If no voltage at red wire you have a bad wire to t-stat. Start fishing.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now