Ask Experts Questions for FREE Help !
Ask
    trevsmiley's Avatar
    trevsmiley Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Oct 28, 2008, 09:14 PM
    Furnace fan never stops
    I have an old furnace-20-30 years old which the fan doesn't turn off. We have an old Honeywell thermostat with a the mercury tube inside. I was thinking I could just replace it with a newer programmable one. Will this solve the problem? Is there anything else I can try before replacing it? I have no experience with thermostats but am somewhat handy-I've repaired a dryer, have tools and know a little about electronics. Thanks for any help!
    Sam
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 28, 2008, 11:39 PM
    Your furnace probably contains a fan and limit control. That is probably the cause of the problem and not the thermostat.
    trevsmiley's Avatar
    trevsmiley Posts: 3, Reputation: 1
    New Member
    		  
    #3

    Oct 29, 2008, 06:26 PM
    Quote Originally Posted by hvac1000 View Post
    Your furnace probably contains a fan and limit control. That is probably the cause of the problem and not the thermostat.
    How do I find that and reset it? It's an old Williamson Temp-o-Matic furnace. Thanks for the help!
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Oct 29, 2008, 06:42 PM
    There is usually no reset for a fan and limit control. Usually it is a
    Rectangular box with wires going to it.
    .
    Sometimes if you tap on it it might stop blowing but it will need to be replaced.
    It is probably as old as the furnace and has seen better days.
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

MODINE Furnace start and stops [ 5 Answers ]

MODINE hanging (pipe) Shop Furnace 55,000 BTU Flame starts, blower comes on about 30-45 seconds later. Flame shuts off at about 3 Minutes, blower continues to run about 5 min. Then cycle repeats. Side note: Have replaced Thermo Coupler last year and blower this year ( about 15- 20 years...

York Furnace stops heating during the day? [ 3 Answers ]

Here is my story I have a York furnace and a Honeywell thermostat. I've run into a situation where either I don't know how to use a thermostat( its electronic) or something is wrong with my furnace. Previously, I would set my temperature on the thermostat and keep it on Auto. From there, the...

Only in AM, gas furnace stops and starts [ 1 Answers ]

Hello I have a Gaffers-Sattler furnace, about 40 years old. Runs great, but for one problem. In the morning around 5 or 6, I turn on furnace and it will heat up and run for about 5 to 6 minutes then stop for about 3 minutes and repeat this all morning long. (frustration as this is when its...

Power to furnace control board but stops there [ 3 Answers ]

Hi I was given a Nordyne KG6RA gas furnace. After installing, I turned on and there was a low hum when the power got to it. I held the door switch closed so I could see. After a few seconds there was a spark and then blue smoke and everything went dead. I could not see where the smoke came...

Furnace squeals but then stops [ 5 Answers ]

The past several months my forced air furnace would all of a sudden start making this high pitched chirping sound and then get even louder throughout the night. When we would shut it off it would squeal until it shut off completely making us think it was a belt. We had used wd-40 and it seems to...

View more questions Search