Carrier furnace 394GAW000050

Reply

  #1  
Old 02-26-20, 02:09 PM
K
Member
Thread Starter
Join Date: Feb 2020
Posts: 1
Received 0 Votes on 0 Posts
Carrier furnace 394GAW000050

Hello!

I've hopefully narrowed this down pretty far and that a more trained brain than my own can push us across the finish line. :)

The details:
- Carrier furnace 394GAW000050
- ecobee3 thermostat
- Has run properly for years (furnace heats, blower turns on, blower turns off when heating is done)
- Now the blower runs continuously, regardless of whether the furnace is heating
- No G-wire, so this is not controlled by the ecobee (according to what I've been told)
- Replaced limit switch which didn't change anything (not to say that couldn't still be it if it was a faulty replacement, but...)

Photos attached. Please let me know if there are any more details or photos I can provide. Thanks!
 
Attached Images       
Sponsored Links
  #2  
Old 02-26-20, 07:51 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 55,153
Received 589 Votes on 554 Posts
Welcome to the forums.

Has run properly for years
That furnace is 40 years old...... has it been cleaned and professionally serviced ?
Manufacturer recommends every year. Every other year is ok.
The heat exchanger needs to be checked for cracks and rust thru.

Is this a standing pilot light or intermittent ignition ?

394GAW manual (pdf)

 
  #3  
Old 03-01-20, 06:16 PM
user 10's Avatar
Member
Join Date: Mar 2004
Location: NA
Posts: 2,022
Received 39 Votes on 33 Posts
Don't spend another cent on that furnace - it's around 60% efficient and probably has a cracked heat exchanger.

The flex gas line in the cabinet is illegal.

Likely a sticking relay on the control board but would have to be diagnosed before changing the part, and as stated above that furnace isn't worth fixing. the board is probably not even available any more.
 
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: