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Commonly Reported HVAC Problems: [Copyright © 1996-2013. Hannabery HVAC. All rights reserved.] Outdoor unit makes strange/loud noises: Heat pumps do tend to makes strange and/or loud noises at times, more so in the winter. Heat pumps have reversing valves that reverse the flow of refrigerant between the heating and cooling modes. During the winter, whenever the heat pump goes into the defrost mode, this valve shifts. Along with that comes a "wooshing sound", which usually lasts for a couple of seconds. After that, the compressor sometimes sounds much louder than usual, almost a "tinny sound". After shutdown the refrigerant pressures equalize, during this period sounds can sometimes be heard, but this is normal.
Sometimes customers complain of a buzzing noise coming from the outdoor unit, even when it's not running. This is usually the reversing valve solenoid coil. It's low voltage (24 volts) so it isn't really wasting energy and sometimes they can be heard.
Below is a list of possible causes. Items in red usually require a service call. Items in blue however can be addressed, some even fixed by the homeowner. Red = Professional fix | Blue = Homeowner fix
The bottom causes in blue are commonly found problems and can be addressed by the homeowner. Try to check for these conditions first before calling for service. Please keep in mind that the information found on our website is provided free of charge and Hannabery HVAC does not assume any liability resulting from the information we provide. We hope this information helps, but please note that these are just rough guidelines, and not all possible situations are covered. Your HVAC system should be inspected and repaired by a trained technician.
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General-Aire Wheel - Complete
With Pad, Rod & Retaining Clip
Fits Model 81 Humidifier Aprilaire Humidifier Water Panel:
Stock #35
Fits Models: 350, 360, 560, 560A, 600, 700, 760, 760A Aprilaire/Space-Gard Air Cleaner Stock #201 Media Replacements:
Fits Models: 2200, 2250 Aprilaire/Space-Gard Air Cleaner Stock #401 Media Replacements:
Fits Models: 2400 Malco TC312 Tube Cutter for Tubing 1/4-Inch-1 5/8-Inch Outside Diameter
Includes spare cutting wheel Electronic Thermometer, -40 C to 232 C, -40 F to 450 F
Includes protective sheath, clip, and battery ![]()
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