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-   -   Blower continuously running (http://www.diychatroom.com/f17/blower-continuously-running-75092/)

AboveTheBULL 06-30-2010 09:20 PM

Blower continuously running
 
Odd problem.

Heil/ICP PGAA36D1K1 residential package A/C-Heat system. Just replaced condenser fan motor and capacitor after condenser fan failed (thank you, beenthere, for the guidance). System puts out cold air now, but I now have another problem: the blower motor won't turn off. I can turn it from "cool" to "off", and it won't make any difference. Blower continues to, well, blow....

What could be the problem?

Marty S. 06-30-2010 10:00 PM

Check to see if a wire came off of the limit switch.

beenthere 07-01-2010 07:54 AM

Also, make sure you didn't switch the fan switch to "on" by accident.

AboveTheBULL 07-04-2010 10:59 PM

Thank you, Marty and beenthere... and happy 4th of July!

To follow up, I already made sure the fan switch is in the "auto" position as normal. I also double checked all wires, and I am certain nothing was left unattached.

I talked to my Mom, and it appears the unit had been doing this for a couple weeks before the condenser fan went out. In a nutshell, the system would engage and bring the interior temp down to the selected level, and then the condenser fan and compressor would shut off. But the blower would keep blowing.

I see now that this is not consistent. Lately, the outside temps have been a bit lower (thank goodness!), and for some reason, the system has been operating more properly -- ie. it will either turn off correctly -or- the blower will turn off up to 3 minutes after the condenser and compressor have shut off. But at least the blower's now shutting off!

So... any ideas? In the automotive world, I would search the wiring schematic for a relay or sticking switch. Of course, I cannot find any schematic for this unit. Anyway, am I on the right track? Any ideas? Anyone? LOL...

Again, this is a 1991 model Heil/ICP package unit (model# PGAA36D1K1). Thanks in advance! And Happy 4th!!!

beenthere 07-05-2010 08:43 AM

Could be the relay on the control board is sticking.

AboveTheBULL 08-29-2012 07:28 PM

....and I'm back!
 
Evening! :thumbsup:

So, I didn't do anything to it back then -- it just seemed to work out it's issues and performed well for about 2 years. But... today, I swing by the house and the inside blower's running, but only hot/outside air is coming out the vents. :huh: And my goodness, it's registering 86 degrees on the thermostat (HOTT!!!) :eek:

I investigate... and just like 2 years ago when I started this thread, the inside blower was running... but the outside unit was not (not even the condenser fan was running). :furious: So, I pulled the circuit breaker at the unit, waited 10 minutes, put it back in, and now the unit comes to life and cools the house down. :huh:

Ok, so the phantom problem is back. Am I looking at needing to replace a limit switch or something? Mom's dead-set on just buying a brand new unit from Costco :no: , but she's on disability -- and I would really cringe at the idea of doing that when a simple $30 switch could have been the fix.

Any ideas, friends? :yes:

beenthere 08-29-2012 07:52 PM

Could be a weak limit switch.

AboveTheBULL 08-30-2012 04:38 AM

Two awesome ideas, beenthere! Two years after you helped me last (with great results), I still know *just* enough about home HVAC to get myself fried good! Is there a way you could steer me in the right direction of parts testing? I've got several multimeters -- digital and analog -- and I'm hoping I can figure this out tomorrow before the super storms blanket the area thanks to Hurricane Isaac. The model number of the unit is Heil/ICP PGAA36D1K1.

beenthere 08-30-2012 06:02 AM

Its not a package unit I'm familiar with the layout of. But the high limit will generally be near the heat exchanger, and have 2 wires on it, both low voltage, that go back to the control board. You can ohm it, it should be closed.


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