Comfortmaker Blower Intermittent Problem - HVAC - DIY Chatroom Home Improvement Forum


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

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

Reply
 
Thread Tools Display Modes
Old 11-12-2007, 04:51 PM   #1
Newbie
 
Join Date: Nov 2007
Posts: 4
Rewards Points: 10
Default

Comfortmaker blower intermittent problem


I have an 18 year old (1989 SnyderGeneral Model #GUH125A016IN) Comfortmaker furnace that has developed a problem. The blower will stay on at the end of the cycle and continue to blow cold air throughout the house. If I hit the induction fan casing a good “thump” with the heel of my hand, it will cause the blower to stop. The furnace will then usually cycle 2-3 times normally (with the blower shutting off at the end of the cycles) and then the blower will stay on again. If I do nothing, and let the blower run, it will continue to run non-stop through 2-3 heat cycles and then shut itself off normally at the end of one of the heating cycles. It will then function normally again for 2-3 more heating cycles, when it will then stay on again. I suppose my “thumping” on the induction motor is causing a vibration, or jarring somewhere, that resets a stuck switch (?) or some such thing.

At no time does the error light come on during the time the blower continues to run.

I have searched the previous postings for a similar issue, but haven’t found one where you still get heat and the blower stays on, but can be shut off with a “thump”.

Any help, and all suggestions, are greatly appreciated.

John

Advertisement

jh44ny is offline   Reply With Quote
Old 11-12-2007, 11:34 PM   #2
no loose ends
 
Join Date: Nov 2007
Location: Southern California
Posts: 39
Rewards Points: 25
Default

Comfortmaker blower intermittent problem


Its been awhile since I've worked on a Comf. Mkr. Sounds to me the fan/limit may be sticking: Burner comes on and heats an element which in turn closes a switch that energizes the fan. After 'stat is satisfied, burner goes out, the fan continues to run, the heated element cools and is supposed to disengage the fan.
Is there a silver colored box (3"x4") next to the draft motor with 'Honeywell' stamped on it? Or, a smaller black box with wires and terminals exposed--you might read 'Cam-Stat' on it?

Advertisement

undone is offline   Reply With Quote
Old 11-13-2007, 11:30 AM   #3
Newbie
 
Join Date: Nov 2007
Posts: 4
Rewards Points: 10
Default

Comfortmaker blower intermittent problem


Thank you very much for the response. You asked "Is there a silver colored box (3"x4") next to the draft motor with 'Honeywell' stamped on it?", yes that is what I have. I removed the cover, and see a dial that has "Fan Limits" on it. I have looked at this before, and wondered if an adjustment there would help, but I am reluctant to "touch things" I don't really understand!

Thank you again, and I look forward to your advice.

John
jh44ny is offline   Reply With Quote
Old 11-13-2007, 07:58 PM   #4
no loose ends
 
Join Date: Nov 2007
Location: Southern California
Posts: 39
Rewards Points: 25
Default

Comfortmaker blower intermittent problem


You can try adjusting the "fan" setting: Unplug or disconnect power, press firmly against the large dial and slide the indecator up about 5 degrees, increasing the temp. setting. If you're mechanically inclined you may desire to remove this from the furnace cabinet and sweep it off with a chipper brush and spray with a lubricant (not WD-40). Or if you have access to a parts supplier, you may consider replacing it. I mentioned in another thread that when a major component in the system reaches a certain age, you might look into changing out the appliance.
undone is offline   Reply With Quote
Old 11-14-2007, 11:48 PM   #5
Newbie
 
Join Date: Nov 2007
Posts: 4
Rewards Points: 10
Default

Comfortmaker blower intermittent problem


undone:

Thank you very much for your time and advice. I'll see what happens next!

John
jh44ny is offline   Reply With Quote
Old 11-16-2007, 10:26 AM   #6
Newbie
 
Join Date: Nov 2007
Posts: 6
Rewards Points: 10
Default

Comfortmaker blower intermittent problem


We're missing the obvious....its 18 years old! Replace it.
VAheatcool is offline   Reply With Quote
Old 12-24-2007, 10:29 AM   #7
Newbie
 
Join Date: Nov 2007
Posts: 4
Rewards Points: 10
Default

Comfortmaker blower intermittent problem


My most sincere thanks to "Undone" for the suggestion as to the Fan Limit Switch being the culprit. It was. I found a supplier, Erb Co. of Buffalo, NY, who took the time to locate a suitable replacement Honeywell Fan & Limit Control (L4064 B 2236) and then explain a few things to me about installing it. The cost was $58 + tax. Everything is running smoothly and back to normal.

Thanks again,
John
jh44ny is offline   Reply With Quote
Old 12-24-2007, 01:53 PM   #8
no loose ends
 
Join Date: Nov 2007
Location: Southern California
Posts: 39
Rewards Points: 25
Default

Comfortmaker blower intermittent problem


It brings me a certain degree of satisfaction knowing your furnace is back in operation.
When given the opportunity to assist someone in need--well, let's just say it is meant to be.
And so, with this 'favor', if you will, pass on the true meaning of this season--Give to someone in need and it too will return to you.
Thanx for letting me be of assistance. And again, have the most blessed Christmas of all!

John (aka, undone)
undone is offline   Reply With Quote
Old 10-05-2008, 04:16 PM   #9
Newbie
 
Join Date: Oct 2008
Posts: 1
Rewards Points: 10
Default

Comfortmaker blower intermittent problem


I read your excellent comments to jh44ny about the fan/limit sticking. I have a Comf mkr and mine is sticking too. I removed it and saw no real serviceability. I appears that the affixed coiled metal screw that goes into the heat exchanged does not have enough tension in it to properly kick the switch to turn the fan off after it cools. I figured this out as I watched the dial return to cold position and the fan just kept running. I put a nail in one of the holes in the face plate of the dial and moved it counter clockwise thinking it did not have enough return travel. Nothing. Then I wound it 90 degree left and let it go and the spring action had the kick to shut the fan off. I am going to order a new part as at 17 years it owes me nothing. But the mechanic in me wants to know how this thing works? Does the metal fatigue and lose its ability to kick. Am I correct that it has to kick? Is this part serviceable? How would you lubricate it? Is there an adjustment that would fix this problem.
infotom is offline   Reply With Quote
Old 10-05-2008, 04:26 PM   #10
Electrician
 
SD515's Avatar
 
Join Date: Aug 2008
Location: Near Jackson Michigan Area
Posts: 1,451
Rewards Points: 502
Default

Comfortmaker blower intermittent problem


The metal does fatigue over time and loose it's spring tension. I don't know if I would call it a 'kick', it merely mechanically opens the switch. After 17 years of service for you, it's time for a replacement part. It's not serviceable that I know of.
__________________
Kyle

Just because you can, doesn't always mean you should
SD515 is offline   Reply With Quote
Old 10-05-2008, 08:19 PM   #11
Newbie
 
Join Date: Oct 2008
Posts: 5
Rewards Points: 10
Default

Comfortmaker blower intermittent problem


I have a Comfortmaker GUH100, I have replaced flame sensors, limit switchs and ignitors over the years, as i recall the 3 blink open pressure switch indicator often came on. This year the ignition sequence will not throw power to the ignitor, I have tested the ignitor and it works, I have tried to start it with the with limit and pressure switch jumpered to the go ahead postions for the control board to turn the ignitor on but it does not do it, a repalcement board is about $100. in 2005 i repalced the draft motor. I am at my wits end with this furnace!
jflag is offline   Reply With Quote
Old 07-31-2011, 10:20 AM   #12
Handyman
 
Join Date: Jul 2011
Location: MD
Posts: 1
Rewards Points: 10
Default

Comfortmaker blower intermittent problem


i have a 1989 comfortmaker I changed the blower motor andt the sensor, the thermostat and the run compactor I got it to work for a day but it went off again I get 24 volts from the themostat but the outside unit or the blower motor will not come on. I put a jumper from the themostat screw directly to the out side both work find but will not cut off. help
wesch is offline   Reply With Quote
Old 07-31-2011, 07:41 PM   #13
Newbie
 
Join Date: Oct 2008
Posts: 5
Rewards Points: 10
Default

Comfortmaker blower intermittent problem


Quote:
Originally Posted by wesch View Post
i have a 1989 comfortmaker I changed the blower motor andt the sensor, the thermostat and the run compactor I got it to work for a day but it went off again I get 24 volts from the thermostat but the outside unit or the blower motor will not come on. I put a jumper from the themostat screw directly to the out side both work find but will not cut off. help
Is this just a air handler or does it also have a furnace, how long have you had this system? which sensor? Do you mean run capacitor? If I recall there are a total of 3 (safety) switchs related to furnace function that will cause the controller to lock out. The fact that it worked for a day is strange, is there moisture building or backing up somewhere? What does the controller board flashing LED code read? pics of your wiring may also help, Is the wire to the outside unit new? and is it heavy enough gauge? Can you test the capacitor?

Advertisement


Last edited by jflag; 07-31-2011 at 07:43 PM. Reason: adding info
jflag is offline   Reply With Quote
Reply


Thread Tools
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
Comfortmaker furnace problem dragon2125@hotmail.com HVAC 2 12-07-2008 02:12 PM
Comfortmaker furnace problem Big Red HVAC 11 02-10-2008 06:56 PM
Comfortmaker problem Jim714 HVAC 1 10-14-2007 09:17 PM
Furnace Blower Problem SGecko HVAC 2 09-27-2006 11:16 AM




Top of Page | View New Posts