Have you tried just turning the fan on without asking for heat/cool?
Weird noise when HVAC starts up
Sometimes, whenever my HVAC turns on to cool or heat, it makes a loud, deep thumping noise when it first turns on.
It almost seems like it's trying to start up, but getting stuck, making this thumping noise and stopping briefly. So, the air blows, thump, stop, air blows, thump etc but eventually (after maybe 5-10 of these cycles) it runs normally.
Any idea what it could be?
It almost seems like it's trying to start up, but getting stuck, making this thumping noise and stopping briefly. So, the air blows, thump, stop, air blows, thump etc but eventually (after maybe 5-10 of these cycles) it runs normally.
Any idea what it could be?
1 - 11 of 11 Posts
is the indoor blower belt driven?
You have a heat pump?
Do you know how to check a capacitor? (You'd need a meter specifically for it) You comfortable with electricity?
My guess is that either, the run cap is half dead and/or the compressor is getting stiff. If the cap checks out good, then a hard start kit is the next option.
Cheers!
Do you know how to check a capacitor? (You'd need a meter specifically for it) You comfortable with electricity?
My guess is that either, the run cap is half dead and/or the compressor is getting stiff. If the cap checks out good, then a hard start kit is the next option.
Cheers!
Yes, I actually just did that, and the problem still occurs. What does this tell me?Have you tried just turning the fan on without asking for heat/cool?
I have no clue. How would I be able to check this/find this out?is the indoor blower belt driven?
Yes, I do have a heat pump. I do have a multimeter, if that's what I would need to check the capacitor. I'm comfortable enough with electricity, especially since I would thoroughly look up how to do anything first.You have a heat pump?
Do you know how to check a capacitor? (You'd need a meter specifically for it) You comfortable with electricity?
My guess is that either, the run cap is half dead and/or the compressor is getting stiff. If the cap checks out good, then a hard start kit is the next option.
Probably duct bellowing out when the blower comes on.
Take a recording of the sound and post it. (YouTube link)
Cheers!
Cheers!
When is the last time you had your blower fan cleaned? It's not that hard to do. It'll take about two hours total to take apart, clean really good and then put back, if YOU"RE really careful. (Shop vacuum required).
Sub
Sub
Do you have a gas furnace or air handler?
Post the brand name and model #
If you have a furnace or air handler with a Variable speed drive ECM DC motor it will rock and thump when it starts. It is self adjusting. However it should only last a few seconds unless something is wrong with it.
Post the brand name and model #
If you have a furnace or air handler with a Variable speed drive ECM DC motor it will rock and thump when it starts. It is self adjusting. However it should only last a few seconds unless something is wrong with it.
1 - 11 of 11 Posts
- This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
DIY Home Improvement Forum
A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! Helping You to Do It Yourself!
Full Forum Listing
Explore Our Forums
Top Contributors this Month
View All
Nealtw
1050 Replies
chandler48
966 Replies
DoomsDave
502 Replies
Recommended Communities
