Lennox FM21 Control Board

Reply

  #1  
Old 08-04-07, 08:53 AM
2
Member
Thread Starter
Join Date: Aug 2002
Posts: 134
Received 0 Votes on 0 Posts
Lennox FM21 Control Board

I have a lennox heat Pump with a FM21 control board. The cooling quit working the other day. Nothing at heat pump appears to be running. Fan on furnace is the only thing that runs. What contacts on the control board do I touch (test) to see if it is a circuit issue? Y1 is the 1st Stage Cool/Heat. What other contact do I connect to test Y1?
 
Sponsored Links
  #2  
Old 08-04-07, 06:39 PM
Ed Imeduc's Avatar
Member
Join Date: Aug 2002
Location: Mountain Williams Missouri
Posts: 18,386
Received 0 Votes on 0 Posts
Wink

Do you have a high head reset in the unit?? Do you have 24V at the contactor. If you push the contactor down does it run fan and compressor?
R to Y should make the compressor and fan run outdoor's. BUT with out O I think it will run in heat. Might check the defrost control board also
 
Reply
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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: