Return to the Heating & Air Conditioning Forum | Post a Follow-Up

 o
Stuck in defrost?

Posted by bjp999 (My Page) on
Tue, Dec 6, 11 at 20:54

I asked some questions here and got some great advice about my Carrier Infinity system (3T and 4T Performance Series 2 Stage Heat Pumps / Infinity Air Handlers / Infinity Controls). Has been working absolutely fantastic. Heating and cooling bills improved and house much more comfortable. The duct work changes seem to be working well, as are the Aprilairre filters. Static pressue quite good!

But we've got a strange thing happening. Company not sure what is happening. Early one morning, with temps around freezing outside, the 3T unit started blaring VERY loud. Might be defrost cycle, but seemed quite a bit louder to me. Anyway, it stayed in that mode for 30+ minutes. Company said to turn it off, which we did, and repair guy, who came about 2 hours later, could not make it happen again.

The second time it happened the blaring did not seem as loud. Almost same situation, early morning, temps around freezing. Repair guy had asked us, if it happened again, to check some things, so we looked at the infinity control which said that defrost was NOT on. Fan was running on outdoor unit, and line was cool. Lots of dripping water around outside unit. We turned off the unit and waited about 15 minutes. Turned it back on. Within 20 minutes it was blaring again. Still no defrost notification on the control and same conditions at outdoor unit. I turned it off until nighttime and it has not recurred. Temps have been warmer since then.

Repair guy said it sounded strange, and thought it might not be the defrost board or sensor, but might be "compressor bypass." He was going to do some research. Wife is worried this is causing excessive wear and tear, not to mention using a lot of electricity. We're worried it will happen when we're not home and last all day.

He is coming tomorrow morning. Anyone have any idea what could be causing this?


Follow-Up Postings:

 o
RE: Stuck in defrost?

Tech could be right sounds like a restriction somewhere in your system. It would be intermittent on a heat pump because refrigerant changes direction. Also could be a sticking reversing valve or faulty compressor but I doubt the latter.


 o
RE: Stuck in defrost?

I wonder if the second stage on the compressor is the culprit. Maybe when it kicks in the second stage it gets noisy.


 o
RE: Stuck in defrost?

Was poking around here and realized I never responded with a final resolution. Turned out to be a bad reversing valve exacerbated by a long lineset. They replace the reversing valve with a heavier duty one. No recurrence. Still incredibly pleased with my Carrier Infinity purchases. Both units working well, energy bills much lower, and family happy year round!


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Heating & Air Conditioning Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here