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Old 12-08-2013, 08:40 AM   #31
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Quote:
Originally Posted by swapplegate View Post
This is the OPc.
So you say when you turn on the thermostat you hear a click and
nothing else.....
WHERE is the click?
My thermostat clicks when it "is calling" for heat.
A second or 2 later -
My furnace clicks and I hear the fan start immediately.

Is your click coming from the furnace or the thermostat?

Still gonna be hard to trouble shoot from here.
Good luck!
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Old 12-08-2013, 08:41 AM   #32
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Quote:
Originally Posted by swapplegate View Post
This is the OPc.
This is the OP, I haven't had the opportunity to work on the furnace yet, we are staying at a house for a few days. There is ice and snow everywhere right now.
I HIGHLY APPRECIATE all the feedback that I am getting from everyone.
I had to do a quick winterize to make sure nothing froze up. But as soon as I can I will put all of your great advise to work. Then I will let everyone know what I had to do to get it fixed. Thanks again!!
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Old 12-08-2013, 08:45 AM   #33
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Quote:
Originally Posted by KyDan View Post

So you say when you turn on the thermostat you hear a click and
nothing else.....
WHERE is the click?
My thermostat clicks when it "is calling" for heat.
A second or 2 later -
My furnace clicks and I hear the fan start immediately.

Is your click coming from the furnace or the thermostat?

Still gonna be hard to trouble shoot from here.
Good luck!
Oh I can hear the thermostat and the furnace click, it even sounds like it is going through its cycle of trying and then shutting down.
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Old 12-08-2013, 08:47 AM   #34
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Originally Posted by Dave_Monica View Post
Aren't they separate impellers on a common shaft...why wouldn't blowing air into the intake or exhaust port not turn the common shaft?

Dave
Yes, one motor; common shaft with 2 squirrel cage fans; one inside the plenum and one outside to provide combustion air.

Clicking means the fan and motor is OK.

No ignition with clicking means you need to look at mixture.

Propane? Y/N - Does range have tall blue flames with ALL ON?
Solenoid Valve Open? Y - smell gas when clicking N - no gas smell
Mixture? Obstruction in flue too rich - Obstruction in jet - too lean.

Clean out flue with compressed air
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Old 12-08-2013, 10:03 AM   #35
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Quote:
Back to the OPs problem....
The furnace "just clicks" and nothing else.
My furnace does not have separate fuse for fan motor and control board.
One fuse does it all.
If mine just clicked it would probably mean the fan relay was coming on
but the fan motor was not turning.
I'd expect to blow a fuse if the motor was locked up or blocked by wasp
nest.
As mentioned earlier it could be a dead spot on the blower motor but that's
pretty rare.
Could be bad relay or loose wire between relay and motor.

This one's gonna be hard to trouble shoot thru a keyboard.
I hope they have aux heat! It's pretty cold just about anywhere in North America right now!

I did see where Key West was in the 80s.....
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My fan was doing the same thing had to replace fan motor. Plus there was a trailer in the CG this year that the fan would not run. The fan motor was accessible from the outside. We could move the fan motor 1/4 turn and furnace would start up. It ran several cycles till it stopped on the bad spot again and not run. Turn motor and away it went. Had to change fan motor, he has not hat a problem since.
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Old 12-08-2013, 10:05 AM   #36
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Originally Posted by OldCoot View Post
On any squirrel cage fan, if you block an inlet, you 'unload' the fan and the speed increases and current draw will drop. Opening the fan inlets load the fan, decrease the speed and increases current draw. Blocking an outlet will increase the static pressure and increase the current draw.
X2.
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Old 12-08-2013, 10:35 AM   #37
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Quote:
Originally Posted by herk7769 View Post
Yes, one motor; common shaft with 2 squirrel cage fans; one inside the plenum and one outside to provide combustion air.

Clicking means the fan and motor is OK.

No ignition with clicking means you need to look at mixture.

Propane? Y/N - Does range have tall blue flames with ALL ON?
Solenoid Valve Open? Y - smell gas when clicking N - no gas smell
Mixture? Obstruction in flue too rich - Obstruction in jet - too lean.

Clean out flue with compressed air
Herk, The fan motor needs to be running to close the sail switch which is normally open N/O per the wiring diagram. OP say's it is not running. If the switch will not close from the air flow the ignitor should not be trying to lite. Sequence go's from stat to fan to limit n/c to sail switch n/o to ignitor. If any of those do not close to pass power there is no way possible the ignitor should work unless there is a short in the modular. The fan has to be proven before the ignitor should click 3 x's unless he is hearing the stat only click, then it's a bad sub base not making contact. easy to prove just jumper RH to W on the base. It is pure injection being nobody is taking a reading with a meter. But possible things to check by his (OP) description. Things he might not have thought about.
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Old 12-09-2013, 07:51 AM   #38
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We still haven't got a firm answer on whether Steve's fan motor is
running or not.
Guess this one's on the back burner till he has time and agreeable
weather to diagnose further.
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Old 12-09-2013, 08:15 AM   #39
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I stand corrected (again). Trouble with too many problems in the same thread.

If the fan motor does not run, nothing will happen as they say. If the fan runs too slow, nothing will happen. The sail switch must close to get power to the ignition control board's ignition circuits.

Causes of NO rotation:

Very rusty/corroded motor shaft
Bad commutator in the motor (flat spot)
Burned out motor
Blown fuse (main in power center or fuse at furnace) (see photo)
Large Mud Dauber nest that attaches the fan to the metal enclosure
Bad Gas solenoid Valve (N.C. side is open)
Bad main control board

Causes of SLOW rotation (not enough air flow to close plenum switch (sail)

slightly rusty/corroded motor shaft
Bad motor (slow rotation)
Mud dauber nest inside fan (low air flow - slow rotation)

I understood the "clicking" to mean the ignitors are trying to light the gas.
My bad.
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Old 12-09-2013, 01:01 PM   #40
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In the first post it states that it clicks, no fan no heat. It was working until recently. My guess is a bad spot on the motor.
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