Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 09-27-2009, 02:00 PM   #1
Newbie
 
milkshake36's Avatar
 
Join Date: Sep 2009
Location: Millington,TN
Posts: 1
Rewards Points: 10
Exclamation

Troubleshooting Robertshaw Ignition


Right before this past Spring, me and the wife went through a trying time with the heat. It's a Coleman Evcon- model# DGAT056BDC/ 56BTU Input 46BTU Output

What's been happening is the heat will try to cycle on and not follow all the way through. What I mean by that is: the glow rod will light up and the gas will kick in, then there will be a good blue flame for about 10 seconds then the flame shuts off along with the glow rod. The smaller blower motor on the right side will keep running and will not shut off until the thermostat is turned down. Unless it is turned down, the unit will keep trying to turn on for about 3 times then the glow rod and gas quits turning on except for the smaller blower motor. In order for us to get the heat running, we let the unit try to cycle on and when it fails to we try the same thing for about 5 times until it finally stays on.After doing the last, most of the time the heat would stay on all night until we turned down the thermostat.
We did call out a tech. for this issue and all he did was use some sand paper to take off some of the carbon on the glow rod. He put that back in and that lasted for about 2 weeks. It then started to do the same thing again.

Ignition Control--> Robertshaw Model# HS780 43NR-306A
Part# 100-00812-45 Input Voltage 120/24VAC 60Hz
Evcon 1474-006

milkshake36 is offline   Reply With Quote
Old 09-27-2009, 02:43 PM   #2
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 9,597
Rewards Points: 2,332
Default

Troubleshooting Robertshaw Ignition


How old is the furnace? Remove the front cover and take 3-4 pics of the burner area and ventor fan (pushes smoke to the chimney) and post them here or photobucket/links here. Lots of different Coleman units and some I know some weird problems with.

yuri is online now   Reply With Quote
Old 09-27-2009, 09:51 PM   #3
as seen on tv
 
Join Date: Mar 2009
Location: pa
Posts: 205
Rewards Points: 150
Default

Troubleshooting Robertshaw Ignition


could be flame sensor, dirty or bad ground,
qbert is offline   Reply With Quote
Old 09-27-2009, 10:28 PM   #4
Member
 
HvacWiz's Avatar
 
Join Date: Nov 2006
Location: Northwest Ohio
Posts: 286
Rewards Points: 250
Default

Troubleshooting Robertshaw Ignition


Sounds like flame sensor needs cleaned.
HvacWiz is offline   Reply With Quote
Old 09-28-2009, 10:49 AM   #5
Member
 
Join Date: Dec 2008
Location: West Michigan
Posts: 440
Rewards Points: 250
Default

Troubleshooting Robertshaw Ignition


The furnace proves the flame through the ground. If the rod and burner surfaces are not clear it will not prove the flame. Also the furnace needs a good earth ground and the control needs to be well grounded. Could also be a faulty control. I would suggest checking the roof jack, (chimney), to make sure the center flue pipe is not rotting and falling into the furnace and plugging the flue passage. This will cause the furnace flames to go out due to a lack of oxygen.
SKIP4661 is offline   Reply With Quote
Reply


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
GMP100-3: No ignition thelazydogsback HVAC 2 04-28-2009 10:13 PM
Changing ignition modules Mr Fix It HVAC 1 03-14-2009 05:31 PM
This may help someone with carrier ignition problems AweMan HVAC 15 02-09-2009 01:20 PM
furnace ignition troubleshooting buju HVAC 22 01-14-2009 10:41 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.