I am having problems with one of my two furnaces. When the thermostat
kicks in, the furnace will light, but the fan won't kick in. Then the
furnace shuts down. If I turn off the heat (i.e. not on heat or
cool), and turn the fan to "on", it just hums (the other furnace works
fine and the fan will run). There is a solenoid that clicks, then the
humming. The fan itself turns effortlessly.
Do you think this could be a problem with the capacitor, solenoid or
Also, I have been having another problem (probably unrelated?) once a
year every winter when I first start the furnace. The fan doesn't
want to kick in but I didn't notice any humming - this appeared to
have something to do with that timer-like dial (is it a temperature
limit switch?). Two taps with the end of a screwdriver and I'm
usually OK for the year.
Any ideas on either problem? Thanks.
Too many variables to diagnose by remote control like does the blower
(fan) motor have a start cap , run cap , both or neither (blower motors can
be any of these). Could be a cap problem , relay problem , open start
winding or none of these -again depending on your equipment. The best bet is
call in an HVAC tech to take a look and I hope your not hitting the fan
limit switch with that hammer as it is also a safety device :-( .
On 23 Nov 2003 09:33:42 -0800, firstname.lastname@example.org (Mark) wrote:
I'd replace the capacitor and see if that fixes it. They are cheap
enough to take the gamble. If that dont fix it, the fan motor is
probably shot. Take out the whole blower and take it to a motor
repair shop and have the motor tested and repaired or replaced.
Blower removal should not be that difficult. Probably 4 bolts, and
the wires. Of course shut off the power @ the breaker when you remove
You aren't too bright......telling somebody to stick their fingers into a
blower wheel with the motor energized????
I hope you got real good liability insurance when "Lefty" comes knocking on
Steve @ Noon-Air Heating and A/C
If you live in or near a decent size town, and really know how to work
Lock it out, mark both ends of all connections, pull the fan motor ( take
fan off) and the capacitor and take them to your local electric motor
rewinding shop. Look for sign that says "counter" in some form. Wait in line
patiently, be nice and offer the guy a soda or coffee.They will be able to
quickly test both (because they have to disprove 'returns') and sell you
the right one wholesale.
The small motors are not rebuilt, but replaced, should be $35 (often) to
It's not rocket science, don't get killed.
this is Turtle.
Mark you need to oil the motor before it eats the bearing up in it and you
have to change it. If you have been oiling it, Change the motor out and the
capasitor. Don't mess with repairing a motor for all your asking for is
This is Turtle
He had me for a minute here and was gazzing at the screen. I can remember
changing a bunch of belts on hvac system [ new stuff ] but he said they
don't have them. i had to stop and try to remember where I've been to check
on this statement. Awwwwwwwwwwwwww Some of them there new hvac system do
have belts. Hey thank you for reminding me I'm suppost to change the belts
on the First Baptist church in Pitken , Louisiana for I was suppose to
change them last Friday.
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