mtpizza Report post Posted October 12, 2016 We have a 2014 Enegra Aspire 44B with Aqua Hot LP 400 heating system. The heating unit makes an awful "howling"sound when in operation. We have had techs replace exhaust system which Aqua Hot said should fix the noise. It did not! We had Entegra at the factory check it out and they said they adjusted and fixed the noise, that did not fix it either! Any experience and how to eliminate the noise would be great! Thanks for your input as it is pretty annoying when in a RV park! Share this post Link to post Share on other sites
hermanmullins Report post Posted October 12, 2016 MT, Does it by some chance only howl when there is a full moon? Sorry about that. Can you determine if it is in the unit or in the duct work? You should have several zones and each has it own valve and pump. I would start with those. Check each with a probe while the unit is howling. Herman Share this post Link to post Share on other sites
manholt Report post Posted October 12, 2016 We had a Post on this same problem around 18 months ago, in this section...I just tried but could not find it. I think it had to do with soot build up... Share this post Link to post Share on other sites
jleamont Report post Posted October 13, 2016 Mtpizza, has it always been this way? Mine is also relatively loud (different model) my friends comment often, sounds like a jet afterburner..... below is a link to an Aquahot forum, the moderator owns a business servicing them. He has helped me a few times with odd problems. http://forum.rvhydronicheaterrepair.com/forumdisplay.php?5-Aqua-Hot-Questions Share this post Link to post Share on other sites
five Report post Posted October 14, 2016 You might try the AH forum: http://forum.rvhydronicheaterrepair.com/activity.php?s=6d16a1e3163c5f2d0a38276b3511fe36 Share this post Link to post Share on other sites
