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Heat Pump Makes Loud Noise When Turning On


It’s normal for heat pumps to make a low humming sound when they’re on and running. However, you should be concerned if your unit is making loud, unfamiliar noises. You should contact a professional if you believe something is wrong with your heat pump, especially strange noises.

If you ever hear strange noises coming from your heating system, call John Stevenson Plumbing, Heating & Air Conditioning, Inc. at 760-276-6690 or contact us online. Learn what causes the various noises heat pumps make from a trusted HVAC technician.

Heat Pump Making Clanging Noise

Turn off the unit immediately if you begin hearing a metallic banging or clanging noise. Check the fan if you hear this sound, as it could be coming from the blades hitting something inside the unit. There could be ice, debris or a loose component inside the unit.

Heat Pump Making Squealing Noise

Screw compressors usually make a squealing or screeching noise. You should contact an HVAC repair expert to get your unit checked if the noise began recently and you haven’t made any changes to your system. The compressor may be putting excessive pressure on the refrigerant, a problem that will increase your heat pump’s operating temperature while preventing the unit from heating and cooling properly.

Heat Pump Making Buzzing Noise

A buzzing sound coming from your heat pump could be the reversing valve in winter. You may still hear this noise even when the unit is off because its valve’s solenoid coil always runs at low power. This noise could be due to a minor issue like a loose screw; however, there’s also a chance you’re facing serious problems like compressor failure, ice in your unit, motor malfunction, a refrigerant leak, or power issues.

Heat Pump Making Rattling Noise

There could be a loose component in your heat pump if it’s making rattling sounds. The screws on the unit’s cover may need tightening, or the piping for the refrigerant could be in the wrong position. Your ductwork could also have leaks, gaps or debris.

Get in touch with an HVAC professional if you’re hearing noises such as these coming from your unit. For quality heating and cooling services, you can count on John Stevenson Plumbing, Heating & Air Conditioning, Inc.. Call us at 760-276-6690 or fill out our contact form to request an appointment.