Coleman 3400 818

Questions about repairs and parts for Coleman furnaces, air conditioners and heat pumps for manufactured homes. Click here for Coleman parts.

Moderators: Greg, Mark

Locked
rswynkoop
Posts: 2
Joined: Mon Feb 01, 2010 10:51 am

My furnace has been randomly not kicking on when the thermostat drops below the set temp. My husband can get it to restart by removing and replacing the safety disconnect, and that works for a few days, then it does it again. Any ideas as to why?
Top
User avatar
Robert
Moderator
Posts: 6413
Joined: Wed Feb 28, 2007 12:07 am
Location: Tennessee

Usually caused by a bad sequencer, limit or breaker/fuse disconnect.


Thanks,
Robert
Some people are Humbly Grateful, while some are Grumbly Hateful.................... Which one are you ?
Top
rswynkoop
Posts: 2
Joined: Mon Feb 01, 2010 10:51 am

Robert,
Is there a way to narrow down which part by testing? If so, how?
Top
User avatar
Robert
Moderator
Posts: 6413
Joined: Wed Feb 28, 2007 12:07 am
Location: Tennessee

Hi,

At each element coil, there is a spade terminal on a ceramic base at far left end and far right end.

Left side goes to sequencers, right side to limits.

Test left, then right side of each to ground for 120VAC.

IF you have 120VAC, the sequencers, limits and disconnects are ok.

If not, they may be bad .

IF you don't get 120vac on right side, jumper the limit.

If you get 120vac then, limit is bad . If still no 120vac, disconnect is bad or a loose connection.


If no 120vac on left side, sequencer is bad if it is getting 24vac to sequencer heater coils at bottom of sequencer.


Thanks,
Robert
Some people are Humbly Grateful, while some are Grumbly Hateful.................... Which one are you ?
Top
Locked
  • Similar Topics
    Replies
    Views
    Last post

Return to “Coleman Service & Repair”