DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > HVAC > Compressor and fan not kicking on

Help Support House Repair Talk by donating using the link above.
Thread Tools Search this Thread
Old 06-22-2012, 06:51 PM  
Junior Member
Join Date: Jan 2010
Posts: 6
Default Compressor and fan not kicking on

I have a Lennox system,, its a 2002. I think the selinoid is starting to go. It works then it does not. But when its not the fan nor the compressor will kick on. I took off the door to the unit and pushed the contacts together manually and it took of running. I also turned it off and sprayed some contact cleaner as I saw some crud in the track the contacts run in.

I have a couple of questions, just above the solenoid is what looks like a second capacitor and its leaking acid? like the stuff that comes off of a battery corrosion. I am posting photos of both the "capacitor" unit and the solenoid. My question is I have a johnstone near by and my father has an account [he is a HVAC contractor] But hes 74 so I can only go so far with him on this.
Since its a Lennox would I be able to get a solenoid at a place like Jhonstone or would I have to go through lennox? What is that black cylinder that is leaking?

Thanks for any help.

Click image for larger version

Name:	resize1.jpg
Views:	161
Size:	51.4 KB
ID:	4035   Click image for larger version

Name:	resize 2.jpg
Views:	145
Size:	31.9 KB
ID:	4036  

Last edited by pennywise; 06-22-2012 at 06:55 PM.
pennywise is offline  
Reply With Quote
Old 06-22-2012, 09:08 PM  
Senior Member
Join Date: Nov 2007
Location: Grand Blanc, MI
Posts: 2,735
Liked 245 Times on 207 Posts
Likes Given: 116


Bad capacitor. Remove it and get the specs off it. Purchase a new one on Dad's account but, as I recall Johnstone does not require a mechanical contractor account/license to purchase products. Cash is king with Johnstone. If your locale is different, find a Grainger's store. If you don't have a Grainger's local to you, check with an electrical supply house. Take that cap to them and they will hook you up with a like rated replacement. Does not have to be a Lennox part as long as there is nothing proprietary about it.
Nice job on the troubleshooting.
Q: Does the contactor remain engaged when calling for "cool"? If not, you may need to replace the contactor too.
Check the contactor coil when it is calling for "cool" and the unit is not running. You should see 24VAC at the coil. If this is the case and the contactor is not engaged then you have found the problem; a bad contactor.

Last edited by kok328; 06-22-2012 at 09:12 PM.
kok328 is offline  
Reply With Quote
Old 06-23-2012, 06:09 AM  
Junior Member
Join Date: Jan 2010
Posts: 6

The contactor would not engage. I had to push it in to start the unit and then it would stay connected. I sprayed contact cleaner on the contactor rail after shutting down the power. When I turned it back on it engaged by itself and has been running for since my last post. I will replace the capacitor and see if a new solenoid is attainable and will put it on for good measure. The unit is about 10/11 YO.

Thanks for the reply.
pennywise is offline  
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
Problem solved: air not kicking in checkin HVAC 2 07-14-2016 01:23 AM
AC problems. Outside unit not kicking on. kcoughenour HVAC 6 06-04-2016 11:55 AM
A/C compressor not kicking on, not cold! onecrazyfoo4u HVAC 15 08-05-2009 06:09 PM
Williamson AC unit not kicking on holmes1997 HVAC 3 06-20-2009 07:33 PM
Blower motor kicking off and on Hntn1 HVAC 3 11-26-2008 01:54 PM

Newest Threads