Question about Heating & Cooling
Posted by Anonymous on
To start with, the more I look at a system, the more familiar I become with that unit. Also, these machines can make me look like a genius or a fool! If you have a pressure switch problem, it's more than likely an expansion valve issue. I've seen a 2 month old Carrier, 4 compressors at 6 tons each, fail due to their expansion valve having an intermittent miss, closing for no reason, or not opening upon demand. And I spent 3 weeks chasing this because when it fails, all you can do is see the code, troubleshoot a bit, call Carrier tech support, then reset it. I ended up calling out Carrier, yes they have field techs, and it took 2 of them about 5 hrs to figure it out. These 2 only work on chillers, and took them 5 hrs! They adjusted the settings and walked away from it, said it was cycling on to close(each circuit), had damaged the valve. Still under warranty but did not replace. If its not the cooling fan circuit acting up, it may be the expansion valve(s) acting up. In that scenario, the tech is going to need to camp out by the unit, and catch it in the act. If you get a second opinion, call a refridgeration company that has some background in chillers. Or call Carrier.Hope this helps!
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Posted on Jan 02, 2017
You're correct in checking the drain pipe, because it's become blocked. The only trouble is, you're trying to clear the wrong end. The condensate water is spilling out of the air handler because that's where the pipe has a clog. These pipes usually have un-glued joints next to the air handler, for times such as this. If you can't pull them apart, you may have to cut the pipes and reconnect tham with fittings from the hardware store. (which is a normal procedure.) I usually use a wet/dry shop vac when repairing this problem, sucking out the clog & the water, then blowing out the line to where it drains outside. I've also used the clothes hanger technique to drag crud out of the air handler fitting. Hope this is helpful. ;)
Posted on Aug 10, 2007
SOURCE: A/C Fluctuating Pressures
I dont know what you mean by fluctuating. Do you mean small bounces? If so that can indicate non condensables like water in the line. It could be an indication of a weak compressor.
If they are slowly increasing and decreasing then the refrigerant levels could be the cause as well as a weak compressor. As 22 Yooper said. Make sure you are checking based on the superheat target pressures.
Posted on Jun 15, 2008
I had the same problem, I had to remove the lower black rubber stopper right next to the exaust fan and hook up a drain to the unit, as soon as the water drained out the furnace fired right up.
Posted on Dec 11, 2008
check to see if your intake pipe or vent is clear this could cause a flame jump and make it look like a bad flame sensor let me know if this helps
Posted on Jan 08, 2009
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