Results 1 to 8 of 8
  1. #1
    Join Date
    Jul 2013
    Posts
    40
    Post Likes

    heat pump defrost problem?

    We have a new heat pump and I’m wondering if it is defrosting as it should. My wife said the unit was making a noise this morning so I went outside to take a look. The unit is completely covered in frost and ice inside. We did have an ice storm overnight with a little ice on trees but it has ended now and the outside temp now is around 32. Shouldn’t it be clear of ice and frost if the defroster is working?

  2. #2
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    18,267
    Post Likes
    Is it time or temperature defrost?

    Still getting heat without the auxiliary?

  3. #3
    Join Date
    Jul 2013
    Posts
    40
    Post Likes
    Thread Starter
    dont know how it's set for the defrost cycle.

    the temp setting is being maintained but I dont know if it's from auxiliary heat or a combination. I cant tell when the auxiliary heat is on since there is no indicator on the T-stat when it's in operation. If I happen to be standing near a vent when it's in auxiliary mode than I can tell, otherwise I dont know.

  4. #4
    Join Date
    Jul 2013
    Location
    Richmond, VA
    Posts
    4,364
    Post Likes
    Pictures would be helpful since the pattern of ice can be telling of what's going on.

    If you have clear ice on the outside of coil guard (sides of the unit) or fan guard (top of unit), that's due to the weather and no amount of defrosting will get that off. I suggest gently breaking it off with a stick or warm water.


    If the entire coil looks like it has a thin layer of freezer burn on it, it could be that the unit is nearing time for defrost or the defrost cycle wasn't enough to get all the frost off, which can happen in conditions with freezing rain/sleet. A defrost cycle or refrigerant issue is possible too.


    If the coil has a thick layer of freezer burn or ice on the inside of the coil (looking down into the unit), there's likely an issue with the defrost cycle or a refrigerant problem.

    And finally, if there's thin bands of thick freezer burn wrapping around the coil, that can also indicate a refrigerant issue.

  5. #5
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    18,267
    Post Likes
    If electric back up the meter will be really spinning!

  6. #6
    Join Date
    Jul 2013
    Posts
    40
    Post Likes
    Thread Starter
    Service tech is on his way.

  7. #7
    Join Date
    Jul 2013
    Posts
    40
    Post Likes
    Thread Starter
    Defrost is set on temp, not time to answer that ?.

    Noise probably came from icicles dropping into fan blades.

    Unit appears to be running correctly. Tech checked defrost, heat strips, etc and all looks good.

    Many thanks for the usual quick responses. Appreciate you guys.

  8. #8
    Join Date
    Jan 2004
    Location
    PA
    Posts
    76,485
    Post Likes
    Its most likely time and temp defrost. The other option is on demand.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Related Forums

Plumbing Talks | Contractor MagazineThe place where Electrical professionals meet.