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Heat pump makes constant clicking sound

3K views 3 replies 4 participants last post by  JamesBaker 
#1 ·
My older Rheem heat pump is making a constant and loud clicking sound during the heating cycle.. It sounds electromechanical and occurs regularly about once a second. I pulled the corner cover and it’s not the contactor (which appears to be fine), but rather the sound seems to be coming from inside the unit. It seems to be functioning fine. Thoughts?
 
#2 ·
Hi OP! I read an article regarding noisy heat pumps and based on what I read, some of the possible reasons as to why you’re hearing weird noises are the following:
• Loose parts
• Faulty fan
• Refrigerant leaks
• Compressor issues
• Air filter blockage
You can head over to this site to check out the full article and learn more in-depth information on what you can do when you start hearing weird noises from your heat pump. Hope this helps!
 
#3 ·
Sounds more like the reversing valve than anything else -
More than likely, not a leak - if it were, the unit would not function properly - Not air filter blockage as the condenser has no air filter - Pretty obvious if it were the fan making this sound, Compressors rarely make sounds you describe - This would knock out a faulty fan.
Loose parts are possible, but normally do not make an electromechanical sound.

Nice web site to look at though.

Also - please note - this post is 6 months old.
 
#4 ·
The constant clicking sound from your heat pump could be caused by a few different factors, and it's important to identify the source of the noise to determine if it requires attention. Here are some potential reasons for the clicking sound:

  1. Defrost Cycle: Heat pumps go through periodic defrost cycles to remove frost or ice buildup on the outdoor unit's coils. During this process, you may hear clicking or cracking sounds, which are normal and not a cause for concern.
  2. Reversing Valve: When the heat pump switches between heating and cooling modes, the reversing valve is responsible for changing the refrigerant flow. This can produce a clicking sound during the transition.
  3. Expansion and Contraction: Temperature changes can cause components to expand and contract, leading to clicking sounds. This is also generally considered normal.
  4. Loose or Damaged Components: Constant clicking could indicate loose or damaged components within the heat pump. Check for loose screws, bolts, or parts that may need tightening or replacement.
  5. Debris: Sometimes, debris like leaves, twigs, or other foreign objects can get trapped in the heat pump, causing clicking sounds as the fan hits the obstruction. Ensure the outdoor unit is clear of any debris.
  6. Fan Issues: The fan blades or motor might be malfunctioning, leading to unusual sounds. Inspect the fan for any damage or obstructions.
  7. Contractor Relay: The contactor relay, responsible for switching the heat pump on and off, might be clicking constantly due to a problem. If this is the case, it may need to be replaced.
To pinpoint the exact cause of the clicking sound and determine whether it's a normal operational noise or an issue that requires professional attention, it's a good idea to contact a qualified HVAC technician. They can perform a thorough inspection of your heat pump and make any necessary repairs to ensure it operates efficiently and quietly.
 
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