Gas and Oil Home Heating Furnaces - furnace blower
Doityourself.com community forum was created to provide answers to all questions related to home improvement and home repair. Doityourself community can help you find information about how-to topics on small fixes to large remodeling projects. With comprehensive how-to content and expertly moderated community forums DoItYourself.com makes it easy to tackle even the most complex home improvement projects.View Full Version : furnace blower
11-25-00, 12:39 PM
when my furnace heat kicks on some times
my blower wont come on untill i go from auto
to the on position on the thermostat. when the blower comes on i go back to the auto
position every thing is fine. the next time
the heat kicks on the blower might start
in the auto position where do i start.
thank you
JACK
my blower wont come on untill i go from auto
to the on position on the thermostat. when the blower comes on i go back to the auto
position every thing is fine. the next time
the heat kicks on the blower might start
in the auto position where do i start.
thank you
JACK
11-25-00, 12:51 PM
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by jackjacklee:
when my furnace heat kicks on some times
my blower wont come on untill i go from auto
to the on position on the thermostat. when the blower comes on i go back to the auto
position every thing is fine. the next time
the heat kicks on the blower might start
in the auto position where do i start.
thank you
JACK
<HR></BLOCKQUOTE>
when my furnace heat kicks on some times
my blower wont come on untill i go from auto
to the on position on the thermostat. when the blower comes on i go back to the auto
position every thing is fine. the next time
the heat kicks on the blower might start
in the auto position where do i start.
thank you
JACK
<HR></BLOCKQUOTE>
Sharp Advice
11-25-00, 08:15 PM
Hi:jackjacklee
The question here is what happens if you do nothing? Does the furnace burners shut down if the fan fails to start up? If so, then the most likely cause is a defective fan switch.
If the motor will start up on it's own at times, could it be possible your jumping the gun here?
When the fan motor does appear to fail to start up on it's own, check the blower squirrel cage and see if it is turning very slowly. The motor may be wornout or it needs to have the bearings oiled.
If the motor isn't turning on at all by itself and the burners are turning off <cycling on high limit> it could also be a defective fan motor or relay.
Lots of possibilites and checks to make to determine the exact cause of the problem. Remember to disconnect the electric power to the unit before checking the fan or fan switch, relay, wires, etc.
Good Luck,
TomBartco
Natural Gas Energy Technician and Consultant.
Personal Quote:
"Drive Safely. The Life You Save, May Be Your Own."
[This message has been edited by Tom_Bartco (edited November 25, 2000).]
The question here is what happens if you do nothing? Does the furnace burners shut down if the fan fails to start up? If so, then the most likely cause is a defective fan switch.
If the motor will start up on it's own at times, could it be possible your jumping the gun here?
When the fan motor does appear to fail to start up on it's own, check the blower squirrel cage and see if it is turning very slowly. The motor may be wornout or it needs to have the bearings oiled.
If the motor isn't turning on at all by itself and the burners are turning off <cycling on high limit> it could also be a defective fan motor or relay.
Lots of possibilites and checks to make to determine the exact cause of the problem. Remember to disconnect the electric power to the unit before checking the fan or fan switch, relay, wires, etc.
Good Luck,
TomBartco
Natural Gas Energy Technician and Consultant.
Personal Quote:
"Drive Safely. The Life You Save, May Be Your Own."
[This message has been edited by Tom_Bartco (edited November 25, 2000).]
11-26-00, 11:41 PM
Could it be that you are not waiting for the blower to start on it's own? It should not start as soon as the burner comes on...it should kick in when it gets warm enough in the heat chamber.
If this is a defective fan switch...is the fan switch and limit control all in one ? The "old" one piece kind that turns on the fan when the temp is reached and turns it off when the burner shuts down?
If this is a defective fan switch...is the fan switch and limit control all in one ? The "old" one piece kind that turns on the fan when the temp is reached and turns it off when the burner shuts down?