Honeywell L4064Y1474 fan limit


  #1  
Old 09-08-22, 12:09 PM
G
Member
Thread Starter
Join Date: Sep 2022
Posts: 4
Received 0 Votes on 0 Posts
Honeywell L4064Y1474 fan limit

I'm trying to find a replacement for this part. Blower comes on but doesn't turn off after call for heat is done.
 
  #2  
Old 09-08-22, 12:46 PM
user 10's Avatar
Member
Join Date: Mar 2004
Location: NA
Posts: 2,144
Received 50 Votes on 44 Posts
+Most furnaces old enough to use a mechanical fan/limit switch to control the fan have cracked heat exchangers and need to be replaced. Most are 30+ years old.

Assuming your furnace is still safe, if you can't find a cross referenced replacement, should be okay with a newer version provided it is the same length and what you have doesn't have a small heater in it to reduce delay in having the fan turn on.. (length part protruding into the furnace)


 
  #3  
Old 09-08-22, 02:32 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 70,108
Received 2,957 Votes on 2,668 Posts
Welcome to the forums.

How long is the probe length ?
 
  #4  
Old 09-09-22, 01:03 PM
5
Member
Join Date: Jun 2018
Location: USA
Posts: 108
Received 15 Votes on 14 Posts
Try increasing the fan off temperature on the dial a bit.
 
  #5  
Old 09-12-22, 08:21 AM
G
Member
Thread Starter
Join Date: Sep 2022
Posts: 4
Received 0 Votes on 0 Posts
5" probe length
 
  #6  
Old 09-12-22, 04:28 PM
5
Member
Join Date: Jun 2018
Location: USA
Posts: 108
Received 15 Votes on 14 Posts
Did you try increasing the fan off temperature setting?

https://www.supplyhouse.com/White-Ro...ange-5-Element
 
  #7  
Old 09-12-22, 07:16 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 70,108
Received 2,957 Votes on 2,668 Posts
The Honeywell L4064W1080/U and L4064B2228 are also direct 5" replacements.

L-4064 current replacement.
 
  #8  
Old 09-23-22, 09:26 PM
G
Member
Thread Starter
Join Date: Sep 2022
Posts: 4
Received 0 Votes on 0 Posts

Not sure if this part will work. If so how do I hook up the two yellow wires in the middle and do I need to break the middle connector. I tried adjusting the switch but it just doesn't move smooth enough to turn off.

Currently getting quotes to replace the furnace since people say this one is dangerous.
 
  #9  
Old 09-23-22, 09:36 PM
G
Member
Thread Starter
Join Date: Sep 2022
Posts: 4
Received 0 Votes on 0 Posts
Maybe I'm not adjusting it correctly?
The picture above shows that I moved the settings up about 5 degrees higher.
 
  #10  
Old 09-24-22, 11:12 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 70,108
Received 2,957 Votes on 2,668 Posts
You must hold the wheel from turning.... then slide the tabs.
 
  #11  
Old 09-26-22, 08:03 AM
5
Member
Join Date: Jun 2018
Location: USA
Posts: 108
Received 15 Votes on 14 Posts
"Not sure if this part will work. If so how do I hook up the two yellow wires in the middle and do I need to break the middle connector."

You have a down flow furnace. The yellow wires energize the timed on feature of your existing fan control. User 10 had provided a warning regarding this. I don't think the new limit control has that feature. Basically, the heat will rise and never turn on the fan so the timed on circuit is needed. Can't really tell from the picture but it looks like the jumper was removed on the original.
 
 

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