DIY Home Improvement, Remodeling & Repair Forum > Appliances > HVAC > Furnace won't start fan




Reply
 
Thread Tools Search this Thread Display Modes
Old 03-19-2012, 06:47 PM  
eastwind
Junior Member
 
Join Date: Mar 2012
Posts: 1
Default Furnace won't start fan

My gas furnace stopped working properly. If left to its own devices, it will light the burner and overheat--tripping the safety switch. It won't start the blower with the thermostat on 'AUTO'. But if I turn the fan control to 'ON' it will cycle properly and heat the home. I just have to leave the fan on all the time.
I'm hoping this is a simple problem, but I don't want to try to start something that might wind up being major.
Thanks,
EW



__________________
eastwind is offline  
 
Reply With Quote Quick reply to this message
Old 03-20-2012, 08:16 AM  
paul52446m
Senior Member
 
Join Date: Oct 2010
Location: Houghton Lake, Mi.
Posts: 435
Liked 1 Times on 1 Posts

Default

Quote:
Originally Posted by eastwind View Post
My gas furnace stopped working properly. If left to its own devices, it will light the burner and overheat--tripping the safety switch. It won't start the blower with the thermostat on 'AUTO'. But if I turn the fan control to 'ON' it will cycle properly and heat the home. I just have to leave the fan on all the time.
I'm hoping this is a simple problem, but I don't want to try to start something that might wind up being major.
Thanks,
EW
Well its not real simple, If your furnace has a electronic board you need to look at that board and find a post with a wire marked heat. fire the furnace and check this heat post for a while with the furnace running and see if you get 120 volts on it. If you do then the board is good , if you don't then the board is bad.
If you do get 120 volts then check the wiring going from that post to blower. If wire looks good then you might have a bad winding in the blower motor. Paul
__________________
paul52446m is offline  
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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


Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
Furnace will not start when extreme cold ColdandConfused HVAC 12 01-06-2014 05:11 PM
furnace wont start lesley1717 HVAC 3 07-23-2011 12:22 PM
need to know where to start... cablechick Bricks, Masonry and Concrete 3 01-14-2010 06:25 PM
Where to Start cibula11 Flooring 2 06-02-2008 08:05 AM
What to start with? Dan208 General Home Improvement Discussion 4 05-02-2008 10:05 AM

Newest Threads

LATEST SPONSOR DEALS