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Furnace is not able to keep power to it.keeps blowing the circuit

Customer Question
breaker...
furnace is not able to keep power to it.keeps blowing the circuit breaker
Submitted: 2 years ago.Category: HVAC
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Answered in 1 minute by:
5/1/2015
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
Tim H.
Tim H., HVAC Professional
Category: HVAC
Satisfied Customers: 3,971
Experience: Experienced in all aspects of HVAC, both residential and commercial.
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Hi, I'm Tim and I'm an HVAC expert here to assist you with your questions. Please provide all information I request as it makes it more difficult to troubleshoot something when I'm not there onsite. Essentially, you become my eyes and ears. Thanks for the opportunity to help. At the end of our dialog, you will have a chance to rate my service, but please wait until we are finished and you're satisfied you have all the information you need.What have you checked so far? Have you inspected the wiring? The blower motor?
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Customer reply replied 2 years ago
blower motor spins freely
wiring looks all plugged in
Customer reply replied 2 years ago
I replaced the circuit breaker in the fuse box
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
OK, well the most likely causes for a tripped breaker are a bad blower motor or some wiring that is bad, burned, etc.
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Customer reply replied 2 years ago
where is the capacitor for the blower motor?
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
It would be down in the lower compartment in the vicinity of the blower motor itself.
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Customer reply replied 2 years ago
is it separated from the motor itself or attached?
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
Usually separate from the motor, not attached.
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Customer reply replied 2 years ago
this is an air conditioner as well
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
I would inspect the capacitor, as well to make sure it hasn't "blown"
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Customer reply replied 2 years ago
been looking for it
Customer reply replied 2 years ago
can you tell me or show me a picture of what it looks like?
Customer reply replied 2 years ago
doesent seem to be in the schematic
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
That model you gave me, G2D95 is actually a cased coil, not your furnace
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Customer reply replied 2 years ago
where is the model # *****?
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
see here
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HVAC Technician: Tim H., HVAC Professional replied 2 years ago
Inside the top door of the furnace
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Customer reply replied 2 years ago
that's where I got it from
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
The capacitor would look similar to this
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Customer reply replied 2 years ago
near the blower motor
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
It should be. Follow the blower leads. Some go to the furnace board. There may be a couple of brown leads that go to the capacitor.
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HVAC Technician: Tim H., HVAC Professional replied 2 years ago
If this unit has a variable speed blower (ECM) it will not have a capacitor
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Customer reply replied 2 years ago
no capacitor then
Customer reply replied 2 years ago
got a circuit board looking thing I can get a model #
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
But remember, the blower motor is not the only reason for a unit tripping the circuit breaker. I would start by inspecting all high voltage (120 V) wiring. Check the power switch on the side of the unit. Make sure that there are no loose wire nuts, etc.
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HVAC Technician: Tim H., HVAC Professional replied 2 years ago
This may take some time, so if you want to go ahead and do this and come back to it later, that's fine. You have about 5 minutes of chat time left, then it goes to Q and A mode.
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Customer reply replied 2 years ago
check this
white Rodgers model#50a51-210-05
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
It's OK, I found the armstrong model number and we're good.
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Customer reply replied 2 years ago
integrated?
capacitor?
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
On an ECM motor, there is a module attached to the back of the motor. This sometimes acts up.
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Customer reply replied 2 years ago
under a cover?
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
Again, you need to go over everything, not just the motor. Let's not assume it is the motor.
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Customer reply replied 2 years ago
ecm?
Customer reply replied 2 years ago
no acronyms
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
That's what variable speed motors are called.
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HVAC Technician: Tim H., HVAC Professional replied 2 years ago
Electrically commutated motor
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HVAC Technician: Tim H., HVAC Professional replied 2 years ago
ECM
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Customer reply replied 2 years ago
thank you
Customer reply replied 2 years ago
so this model doesn't have a capacitor
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
We're down to 3 minutes on the chat. I would start inspecting the board, the high voltage wiring, the switch on the side, etc. Something is shorting to ground and causing breaker to trip
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Customer reply replied 2 years ago
gimmi a list of what it could be
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
The board (tip it over, inspect the back), the power switch (looks like a light switch), the high voltage wiring inside the furnace (any 120 volt wiring), even the blower door safety switch
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HVAC Technician: Tim H., HVAC Professional replied 2 years ago
The blower motor could be bad, but it is difficult to see anything on the outside of ECM (variable speed) blower motors. If everything else checks out, you could remove the blower motor and inspect it. Take the module off the back of the motor and look inside at the electronics.
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Customer reply replied 2 years ago
I been running bak and forth. the second I hit that blower safety switch is when it loses power
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
Have you tried taking the leads off the blower door safety switch (with breaker off) and just connecting these together and bypass the actual switch?
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Customer reply replied 2 years ago
no
Customer reply replied 2 years ago
hard to test anything w/o power
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
I would try that. These switches are cheap and sometimes go bad. We have to do this by process of elimination.
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HVAC Technician: Tim H., HVAC Professional replied 2 years ago
Also, turn power off and tip the boards to inspect the backs of the circuit boards to make sure we don't have a burned spot on the board
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HVAC Technician: Tim H., HVAC Professional replied 2 years ago
The other thing I'd do is check and see if this unit has what looks like a light switch on the side or near the unit that is basically a power switch. Take the cover off, inspect this and see if this might be bad.
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HVAC Technician: Tim H., HVAC Professional replied 2 years ago
We are basically checking anything that is 120 volts on the unit which includes the circuit board, the blower door safety switch, the light switch (power switch), the wiring, and finally the blower motor.
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