The Hull Truth - Boating and Fishing Forum

Go Back   The Hull Truth - Boating and Fishing Forum > BOATING FORUMS > The Boating Forum
Search

Notices

Random Quote: I caught you a delicious bass. - Napoleon Dynamite
Reply
 
Thread Tools Search this Thread
Old 03-06-2009, 10:07 AM
  #1    
Junior Member
 
Join Date: Mar 2009
Posts: 1
Default webasto heater overheating?

Can anyone offer advice please? My webasto heater runs perfectly for approx 20 minutes then the overheat trip triggers & it turns off . After 5 minutes I restart it & it runs another 20 minutes & fails again. It starts first time . I have disconnected the out put pipework to the cabins so there is nothing impeding the airflow. The exhaust & combustion pipes are clear. I have stripped the outer airflow casing & there are no blockages. The fan appears to run at the correct speed & we have good airflow. The fan is not stiff & rotates freely by hand : Still the trip operates after 20 minutes! Logic tells me the trip is over sensitive unless someone knows differently? I am loathe to invest in a new overheat sensor unless this is a common problem. Any help appreciated. It is a 3.2 KW heater
Bernardtravis is offline   Reply With Quote
Old 03-06-2009, 03:42 PM
  #2    
Senior MemberCaptains Club Member
 
Join Date: Feb 2002
Location: North Charleston, SC USA
Posts: 21,913
Default

See if you can find your model here:

http://www.techwebasto.com/marine_main.htm

Download the manuals and see if they help.
__________________
Ron
2000 Camano Troll

HIGH COTTON
http://www.picturetrail.com/gallery....9&gid=19068769
rwidman is offline   Reply With Quote
 
Old 03-06-2009, 09:15 PM
  #3    
Senior MemberCaptains Club Member
 
Join Date: Nov 2006
Location: Florida Keys
Posts: 5,980
Default

Bernard

As Ron says, a manual will help. I am not familiar with the Webasto details, but if it uses a snap type limit switch, you don't need to be afraid of buying a new one. They are very, very cheap. Even if it uses a more expensive home furnace type of limit switch, they aren't all that expensive. The snap switches are very prone to failure as they age.

Easy way to check is just to bypass the limit switch, once you find it, and operate the heater. See if it then reaches its proper temp and cycles normally on its thermostat. Obviously, you must stay near the unit at all times while running this test, since if the unit should really happen to be overheating, there is nothing to protect it while the switch is bypassed.

The cutout temp for either switch should be in the manual and usually will be marked on the switch. You can test it electrically for continuity below and above its cutoff point, or you can also test it by heating it (after removing it from the unit) in a pan of water using a thermometer to increase temp to the cutoff point. The snap switches snap audibly when they open up. Obviously, you can't immerse many of the furnace-type switches in water unless they have the long probe off the side, in which case you can.
__________________

Last edited by KeyPineSavage; 03-06-2009 at 09:18 PM.
KeyPineSavage is offline   Reply With Quote
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Block heater YELLOWSHARK The Boating Forum 4 12-17-2007 11:13 AM
portable propane heater? JoeyM The Boating Forum 17 02-23-2007 03:01 PM
Cabin heater erikrs301 The Boating Forum 8 10-05-2006 11:06 PM
Cabin Heater Shark Bait II The Boating Forum 1 09-05-2006 07:49 AM
Cabin heater goose70 The Boating Forum 3 11-12-2004 10:26 PM

 



©2009 TheHullTruth.com

Powered by vBulletin® Version 3.7.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.2.0