How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask BillyHvac Your Own Question
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22542
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
Type Your HVAC Question Here...
BillyHvac is online now
A new question is answered every 9 seconds

why does my heating system whistle

This answer was rated:

why does my heating system whistle

Please see other post



Customer: replied 8 years ago.

right now i am listening to a high pitched whistle the is coming from my oil fired hot water system.


It seems to happen most often when we use the hot water


When you use hot water it drops the temp in the tank and kicks on the burner assembly.


Please keep in mind I am going by my own experience with sounds and oddities with equipment, and can not tell you 100% what your problem is.


What I do know is I have heard oil burners whine quite often. I do not know how often you have it serviced but you may want to at least check the oil filter. Some units whistle from restricted oil flow. The pump is trying to pull oil and if anything slows it down, like a plugged oil filter. it will make even more noise.



Customer: replied 8 years ago.
It whistles even when the burner itself is not running

Now that is odd!!


Is this strictly domestic hot water or also home heating?

Customer: replied 8 years ago.

It is alos home heating


I have 4 zones on my system, One of which is the hot water tank

Ok, so here is what my process when researching noises -


Noise can be caused by mechanical components during their operation, and can also be related to pressure and liquid flow.


I identify every pump, motor, zone valve, blower etc. One by one I eliminate them.


2nd, I check pressure relief valves for signs of blow off, ant leaks in the system, and any sign of unit running a higher temp than desired.


Once in a great while something is found to simply be from design..


But in your case I would check circulating pumps, zones, and pressure relief.


One by one you can eliminate items.



BillyHvac and 2 other HVAC Specialists are ready to help you

Related HVAC Questions