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AIR CONDITIONING & HEAT PUMP SYSTEMS
A/C - HEAT PUMP CONTROLS & SWITCHES
BLOWER FAN OPERATION & TESTING
BOOKSTORE - Air Conditioning "How To" Books
DIAGNOSTIC GUIDES A/C / HEAT PUMP
DIAGNOSE & FIX HEATING PROBLEMS-BOILER
DIAGNOSE & FIX HEATING PROBLEMS-FURNACE
ELECTRIC MOTOR OVERLOAD RESET SWITCH
EVAPORATIVE COOLING SYSTEMS
INSPECTION CHECKLIST - OUTDOOR UNIT
LOST COOLING CAPACITY
MOTOR OVERLOAD RESET SWITCH
NOISE / SOUND DIAGNOSIS & CURE
OPERATING DEFECTS, AIR CONDITIONING
REPAIR GUIDES A/C / HEAT PUMP
REPAIR & DIAGNOSTIC FAQs for A/C
WATER COOLED AIR CONDITIONERS
WINDOW / WALL AIR CONDITIONERS
Air conditioner or heat pump noise diagnosis & cure: this air conditioning repair article discusses the diagnosis and repair of air conditioning compressor noises which range in importance from normal (if annoying squeaks and squeals, to rattling loose bolts and hardware, to costly compressor damage indicating air conditioning compressor or A/C compressors at or near end of their life.
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A/C & Heat Pump System Noise Diagnosis & Repair Noises: How to Diagnose Air Conditioner Compressor, Fan, Refrigerant Piping, Ductwork Noises
Possible causes of this particular A/C (heat pump) compressor start-up failure noise include
In the A/C system noise diagnosis article below we discuss how we approach listening to and interpreting noises coming from an air conditioning or heat pump system. CONTACT US by email to submit your own noise or noise+ video recording or if you cannot find the HVAC noise diagnosis information you need. This article discusses:
How to diagnose & repair air conditioning compressor noises from the compressor/condenser, air handler, duct work, filters, or controls
If your air conditioning or heat pump system has lost its cooling capacity or won't start see REPAIR GUIDE for AIR CONDITIONERS. See How to determine the cooling capacity of air conditioning equipment if the system seems to be working but is inadequate to cool your building. Contact us to suggest text changes and additions and, if you wish, to receive online listing and credit for that contribution.
First question in diagnosing HVAC system noises is where are the noises coming from?:
Second question in diagnosing air conditioner or heat pump noises & sounds: what does the noise sound like?
If you hear unusual noise at the air conditioning system, these compressor sounds could indicate the need for a simple service and adjustment requirement. But air conditioner compressor noises might also mean that you face an upcoming costly repair involving replacement of the compressor itself. You should have the system checked promptly by an air conditioning service technician. The following is a list of air conditioning compressor noises and what they may mean about the operation, condition, and remaining life of the cooling system equipment.
Fujitsu has offered some helpful advice in troubleshooting noises that may be heard at the indoor wall-mounted air handler of a split system air conditioner or heat pump. What's particularly helpful is that Fujitsu points out that some noises that people worry about are actually normal and not an indication of trouble. Quoting 
Here are some other noise or sound diagnostic clues for split system air conditioners & heat pumps
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