Air Conditioning - compressor won't start

Doityourself.com community forum was created to provide answers to all questions related to home improvement and home repair. Doityourself community can help you find information about how-to topics on small fixes to large remodeling projects. With comprehensive how-to content and expertly moderated community forums DoItYourself.com makes it easy to tackle even the most complex home improvement projects.



PDA

View Full Version : compressor won't start

mlw3690
08-09-08, 06:19 PM
Have a Lennox HS18, was cooling great then started blowing warm air. The inside fan and fan on outside unit are working. It sounds like a voltage draw ever 5 minutes or so, but the compressor still does not run. The voltage to the outside unit appears to be only 165 volts. Cool air from outside unit fan.
Help!!

Jarredsdad
08-09-08, 06:27 PM
165 is below the lowest operating voltage for that unit.

There is a breaker, or orther voltage problem.

Are you reading the line side or load side of the contactor?

Compressor is off in internal protection. If you don't turn it off it will try and cycle on that switch which will eventually fail and your compressor will be dead.
mlw3690
08-09-08, 06:36 PM
I checked the white and black wire coming from the disconnect to the contactor

Jarredsdad
08-09-08, 07:21 PM
Pull the disconnect and check power going to it. Also check any other 220 outlets you have and see what you get there.

That is a 208/230 volt unit, lowest operating voltage is 187. You've a power problem somewhere.

Carful, don't cook yourself.
ecman51`
08-10-08, 09:42 AM
First check to see which leg of the 240 is weak by checking each leg to ground. That be a test of black to ground, then white to ground. When you find which it is, concentrate on that wire, and associated terminal or socket/buss for breaker, and any other connection outside or inside, where the 240 is derived.