AC question...it's off yet the blower is still running, only way to shut it off is at the breaker.

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[ARCHIVED THREAD] - AC question...it's off yet the blower is still running, only way to shut it off is at the breaker.

Posted: 8/25/2006 9:18:03 PM EDT

House has not been occupied all summer and I went today to attempt to do some work around the place. The breakers were off and when I turned them on the AC blower immediately went on, despite the stat being swithced to AUTO on the fan side and OFF on the HEAT/Cool side.

It shoud not run unless I switch it to FAN ON mode or COOL. Somethings wrong, but I have no idea what it is.

The heat pump ac thingy turns on when I switch it over to cool, but it blows tepid air. An hour of blowing did not reduce the interior temp below 100. I shut it off and headed home.

Any ideas?

Posted: 8/25/2006 9:21:21 PM EDT

[#1]

Is there a little box near your outside unit? (maybe above it on the side of the house) Open it up and see id there's a little metal doorknocker looking thing in there..if so pull it out

Posted: 8/25/2006 9:22:59 PM EDT

[#2]

sounds like a bad thermostat.

Posted: 8/25/2006 9:32:17 PM EDT

[#3]

Could be a bad stat or the fan relay inside the indoor blower unit is stuck..

Posted: 8/25/2006 9:36:12 PM EDT

[#4]

Quoted:
House has not been occupied all summer and I went today to attempt to do some work around the place. The breakers were off and when I turned them on the AC blower immediately went on, despite the stat being swithced to AUTO on the fan side and OFF on the HEAT/Cool side.

It shoud not run unless I switch it to FAN ON mode or COOL. Somethings wrong, but I have no idea what it is.

The heat pump ac thingy turns on when I switch it over to cool, but it blows tepid air. An hour of blowing did not reduce the interior temp below 100. I shut it off and headed home.

Any ideas?

Heat pumps are a little bit more difficult to diagnose. sounds like it has a low charge if it didn't cool down the space or blow out cool air. but it also could be a bad thermostat. Hard to diagnose without looking at it. sounds like a bad stat or bad fan contactor (welded shut)

sounds like it's time to call someone local.

Posted: 8/25/2006 9:44:27 PM EDT

[#5]

Quoted:

sounds like it's time to call someone local.

Grrr.

Posted: 8/25/2006 10:06:27 PM EDT

[#6]

Quoted:

Quoted:

sounds like it's time to call someone local.

Grrr.

Where ya at here ? I'm in Phx. Not an A/C tech, but an electrician with a good bit of time working on them, over the years.

Maybe I can help you out....

John

Posted: 8/26/2006 6:00:12 AM EDT

[#7]

Fan contactor could be "stuck". Does the contactor pull in when you put power to it or does it STAY in when you (or someone else) kills the power? If it stays in, then maybe the contactor needs to be freed up or replaced. Lightning?
Stay safe

Posted: 8/26/2006 6:17:31 AM EDT

[#8]

Quoted:
Could be a bad stat or the fan relay inside the indoor blower unit is stuck..

Sounds about right. Start with the T-Stat, especially if you have had lightning recently. Takes very little to fry a t-stat. Also the CHEAPEST place to start.

Pull cover, check contiuity with stat on but turned high enough to not call for cool. If it OHMS out [beeps] across the tstat then its fried. If thats OK I'd suspect the fan relay. If it's newer I'd then suspect the board but that depends on of the board and if it runs off 24v or 120. [prolly 24] if newer the relay will be on the board anyways.

If digital t-stat start there, very susceptable to problems like this.

Posted: 8/26/2006 10:36:36 AM EDT

[#9]

Offered to help. I'm likely local even.....

No reply here since or to IM sent....

Posted: 8/26/2006 10:54:07 AM EDT

[#10]

Quoted:
Offered to help. I'm likely local even.....

No reply here since or to IM sent....

I live 200 miles out, but thanks for the offer!

Posted: 8/26/2006 11:00:19 AM EDT

[#11]

Quoted:

Quoted:
Offered to help. I'm likely local even.....

No reply here since or to IM sent....

I live 200 miles out, but thanks for the offer!

Ok, so not THAT local

Oh well..... Like others have said, it's more than likely just a stuck fan relay in the air hander, or the thremostat is smoked.

Unscrew/unsnap the thermostat from it's base while the power is on. See if the fan shuts off. That'll tell you whether the problem is the stat, or in the air handler.

Posted: 8/26/2006 11:07:26 AM EDT

[#12]

Quoted:

Unscrew/unsnap the thermostat from it's base while the power is on. See if the fan shuts off. That'll tell you whether the problem is the stat, or in the air handler.

Will do, thanks.

Posted: 8/26/2006 11:23:43 AM EDT

[#13]

Quoted:

Quoted:

Unscrew/unsnap the thermostat from it's base while the power is on. See if the fan shuts off. That'll tell you whether the problem is the stat, or in the air handler.

Will do, thanks.

Ohh, and you might have to wait a little bit after you disconnect the stat FOR the fan to turn off. Some units have a timer and the fan will run for a given number of minutes after the heat/cool call (stat) is satisfied. Some can run for 5 minutes after the stat is disconnected.

It's not COMMON, but it's possible.

Feel free to IM me if you like, when you take the thing off, if you have any more questions. I can probably help you at the very least, determine where the problem is.

John

Posted: 8/26/2006 11:28:32 AM EDT

[#14]

Quoted:

Quoted:

sounds like it's time to call someone local.

Grrr.

Call MCTLTD, Mike Thomas, he will not screw you.

Posted: 8/26/2006 11:29:58 AM EDT

[#15]

Quoted:

Quoted:
Offered to help. I'm likely local even.....

No reply here since or to IM sent....

I live 200 miles out, but thanks for the offer!

Yuma right?

Still call Mike

[ARCHIVED THREAD] - AC question...it's off yet the blower is still running, only way to shut it off is at the breaker.

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