Forum Thread

Home Central AC throwing air but fan not running

SDPirates 1,213 853 May 31, 2011 at 11:53 AM
Hi,

I recently enrolled for PSE&G Cool Customer Program and they installed a small box outside of my AC, I don't know if its related to it, but I turned the AC on y'day and it was not blowing cool air, i checked outside on my AC unit and the fan was not spinning, it had the humming sound inside the unit and the air was blowing out of my vents, which was normal air and not the cool air.

Is anyone having problem like this after enrolling into CCProgram ?

Any easy fix for this, I am not exactly a DIY person for Electric stuff, I can do small painting and pipe cleaning, thats it.

Please let me know what can be done. My AC unit is old like 20+ years, but worked fine last year and y'day was the first day I started the AC this year.

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#2
If the system is working properly, there will be times they cut off the AC compressor allowing only air to circulate, but not the compressor to cool the air. They will do this during peak periods of electricity usage, so they can balance the grid and prevent a total power failure.

But it sounds like your AC compressor is totally not activating at all. I would call them up if that's the case, ie. the compressor not turning on at all.
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#3
Hi,

I called them and got an appt. for the mechanic to come tomorrow morning.

Hope thats the problem, can't afford a new AC right now.

Quote from neteng101 View Post :
If the system is working properly, there will be times they cut off the AC compressor allowing only air to circulate, but not the compressor to cool the air. They will do this during peak periods of electricity usage, so they can balance the grid and prevent a total power failure.

But it sounds like your AC compressor is totally not activating at all. I would call them up if that's the case, ie. the compressor not turning on at all.
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#4
20 years is def on borrowed time, as they said 12-15 was the normal life cycle.

a 3T heat pump runs around $6K and you probably get some rebates, from the power company and manufacture, which would cover the tax.

a regular non-heat pump unit runs around $4.5K
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#5
so your air mover (inside) unit is working but if you said it's not blowing cold air, that means the compressor isn't running. It sounds like whatever they did to your unit is the culprit.

Here's their info on the program:
===========
Program participants receive a professionally installed state-of-the-art programmable thermostat. If summer energy demand in our service area is extremely high, this device allows PSE&G to cycle your central air conditioner compressor on and off to limit the demand on the electric system
===========

Sounds exactly like your problem.

The easiest way to check would be to make sure there's power to the unit and also check to make sure the tstat is in demand (check the output to the AC unit). From their site, they install a special tstat which enables them to fool with your AC remotely. Is there a manual bypass or something?
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#6
i found the problem with mine, fan was spinning but it wasn't a/c coming out, just cool air

mice got into the unit during wintertime and made a nest, chewed through a bunch of the wires.
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#7
If the outside unit was humming, could just be a solenoid went bad on the unit and it is just not switching it on.
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#8
the hum can also be the contacts being energized from the t-stat but no juice going to fan/compressor
can also be related to blown fuses to the unit.
i thought you could override the box they put on?
i also think our program said no holidays or weekends?
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#9
The hum is probably the condenser fan motor (outside fan). It's locked up. You should replace it and it's capacitor.

To verify, turn the power off to the unit and try to spin the fan blade with a stick or screwdriver. Be careful not to bend the blades. It should spin freely. If there is any resistance, then the motor is bad.
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#10
Quote from azianai View Post :
i found the problem with mine, fan was spinning but it wasn't a/c coming out, just cool air

mice got into the unit during wintertime and made a nest, chewed through a bunch of the wires.
that's *EXACTLY* what happened to me last fall. I was mowing the lawn in October and found the AC find *kind of* running. After investigating, I found that a mouse, in an effort to work its way from the compressor/fan compartment into the electrical compartment, had knawed on the wrong wire and shorted it. I replaced the relay, cleaned it all up, etc, and was waiting until this spring to test it. Thankfully it works.
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#11
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Vague questions receive vague answers . . . . . .
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#12
Hi,

The PSEG guy came and said that its not their problem, must be somthing to do with the unit.

When I turn it on, i hear the humming, but fan not moving, as I said, I have done small paint job and some sink pipe cleaning and yes, changed a electrical switch also once.

Do you think there is something I can do myself or I need to get a professional help ?

I rotated the Fan with the screwdriver and it was spinning freely.

Have to fix it ASAP.
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Last edited by SDPirates June 1, 2011 at 07:16 AM
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#13
Quote from SDPirates View Post :
Is anyone having problem like this after enrolling into CCProgram ?
Yes! BGE does the same thing. They advertise that you won't notice the difference, but they lie.


Quote from SDPirates View Post :
Any easy fix for this, I am not exactly a DIY person for Electric stuff, I can do small painting and pipe cleaning, thats it.

Please let me know what can be done. My AC unit is old like 20+ years, but worked fine last year and y'day was the first day I started the AC this year.
You can bypass the unit. But leave it powered so that you can still get the utility credit. It might be best to wait a week or so before doing that ince case hey send someone by to check the unit.

If they are going to lie and call their energy waster switch a "enegy saver switch", I figure it's OK to bypass the unit. After all having your inside fan running all the time with no cold air is wasting electricity. Also, having your compressor cycle on and off like that every 15 minutes is also inefficient.

Either that or do what I did: I only run my central AC at night when they never cycle the compressor; I use my window unit to cool my bedroom, and I can run that anytime. If you have someone home all day and need AC during the day you can't do that.
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Last edited by zzyzzx June 1, 2011 at 07:43 AM
#14
Quote from SDPirates View Post :
Hi,

The PSEG guy came and said that its not their problem, must be somthing to do with the unit.

When I turn it on, i hear the humming, but fan not moving, as I said, I have done small paint job and some sink pipe cleaning and yes, changed a electrical switch also once.

Do you think there is something I can do myself or I need to get a professional help ?

I rotated the Fan with the screwdriver and it was spinning freely.

Have to fix it ASAP.
1- go to the house panel and reset the breaker.
2- check to see the fuses are good at the box near the unit
where is the hum. is it from the compressor or contacts..contacts are in the spot where the wires go into the unit. should have noticed moisture or ice buildup on the larger line if the compressor was running
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#15
Hi stufine,

from what I think, The hum is coming from below the Fan, so I think may be from the compressor.

What do you mean by house panel, I turned off the main switch next to the Furnace in the basement and turned back on and still the same thing. The PSEG guy opened and checked the wires they connected and they were all good.
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