AO Smith Hot Water Heater XCV 40 - Pilot Keeps Going Out

Reply

  #1  
Old 08-29-14, 06:44 AM
Member
Thread Starter
Join Date: Aug 2014
Location: USA
Posts: 2
Received 0 Votes on 0 Posts
Question AO Smith Hot Water Heater XCV 40 - Pilot Keeps Going Out

Hi,
My pilot light keeps going out. I can restart it and the h/w heater every time I need h/w but I would like to fix what ever is broken.
I would like to first try vacuuming out what ever has to be vacuumed out to see if that fixes the problem. If this doesn't work then I might think about cleaning or replacing the thermocouple.

Could you tell me what part of the h/w heater should be vacuumed out, how to best vacuum it out and what kind of vacuum cleaner I should use?

Thank you.
 
Sponsored Links
  #2  
Old 08-29-14, 06:57 AM
lawrosa's Avatar
Super Moderator
Join Date: Dec 2010
Location: Galivants Ferry SC USA
Posts: 17,799
Received 10 Votes on 8 Posts
Hello and welcome to the forums....

If its a series 100 unit the disk/air intake may be clogged.

Read here. Post 48 shows a tool to make that you tape to a shop vac hose.

http://www.doityourself.com/forum/wa...water-hot.html
 
  #3  
Old 08-29-14, 07:48 AM
Member
Join Date: Oct 2008
Location: USA
Posts: 2,878
Received 5 Votes on 5 Posts
Replace the thermocouple. They are cheap.
 
  #4  
Old 08-29-14, 07:56 AM
lawrosa's Avatar
Super Moderator
Join Date: Dec 2010
Location: Galivants Ferry SC USA
Posts: 17,799
Received 10 Votes on 8 Posts
Replace the thermocouple. They are cheap.
These are not normal T couple. Its a pilot assembly with a thermal switch in line. The old ones were set to 180C but the update were 200C models.. That helped some to prolong any issues but it still comes down the cleaning the disk..

See here that blue button looking thing. After overheat it will reset itself when it cools down...

[ATTACH=CONFIG]37302[/ATTACH]
 
Attached Images  
  #5  
Old 09-01-14, 02:32 PM
Member
Thread Starter
Join Date: Aug 2014
Location: USA
Posts: 2
Received 0 Votes on 0 Posts
Now it works(?)!

For some reason, it is working now! The only thing I can think which made a difference was that I gently touched the thin vertical copper tube next to the vertical stainless steel tube coming out of the burner assembly at the base of the hot water heater. Maybe this had been lose?
Thanks for your help.
 
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
Display Modes
 
Ask a Question
Question Title:
Description:
Your question will be posted in: