Learn how to troubleshoot using schematics like a real tech…

Click here to check out our structured, online appliance repair training courses for rookies and experienced techs.

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.


2 posts in this topic

Just an overview-- I have four new Lennox heat pump/AC units in a house that had a major remodel. Two of the units work fine (heat or cool), however, the other two will heat, but not engage the compressor when the thermostat is put on "cool." I have 240 volts to the connections at the units that do not kick on. Am not at home and will provide the thermostat manufacturer and model number of the Lennox units if it will help. Is this likely a thermostat problem? All breakers are on at the blower units in the attic. Blower fan starts up fine, but the compressors don't come on. All units have the same thermostat. Would it be worth trying to switch them to see if they work on the non-operating units? Thanks.

Share this post

Link to post
Share on other sites

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

nodcay,  with the heat pump,  the compressor should be running in both the heat and cool mode.  Sounds to me like it is a wiring issue with the thermostat. Check the wiring on the units that work and make sure the others are wired the same.  Being that they are new units,  check all the wiring and make sure none of the wire nuts dropped off...Ron

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