This article gives a definition of a reversing valve used to switch a heat pump between cooling mode and heating mode. Yes, it is possible that the reversing valve could be stuck half way between heating and cooling. We have processed over 25,000 Successful PayPal Orders! I know the piping pressures have to equalize in order for the system to reverse, but I normally hear a swissssssshing noise like you have said. I heard a sound like a water pipe in the wall thumping. We hope you have a blessed and Happy Holiday Season! Steve. The thermostat should send the 24 volts to the reversing valve coil through the “O” wire on your thermostat. Answer: Yes, if your heat pump reversing valve is not shifting or is stuck in between the heating and cooling mode then you heat pump will make a funny hissing sound or not sound normal. Thanks to Supercool Slide Rule and grayfurnaceman for making these informativ video! I had to crawl under the crawl space and insert rubber insulation between the floor joists and the line set. Menu. If it becomes too noisy you might want to call a service tech to come and make sure the operating pressures and refrigerant levels are right. It’s not the same sound that’s in your movie. It seemed stiff so using a pulling wedge, I pulled it out a little. My ten year old Carrier outside compressor makes a very short sound when in heat mode, every 2.5 minutes. Not all heat pumps are made the same when it comes to how much noise they make. Also, the strange thing is that I haven’t notice the this noise until recently with our 7 or 8 years old Carrier system. 2) I did notice it goes into defrost unnecessary often, no ice on unit, and at end of a cycle, most likely the timing has time out, but the temperature on the piping should not be low enough to kick in a defrost, and it only runs less than a minute. Make sure you do not dent the valve because a dent will make the reversing valve stick even more. Yes, going into defrost mode on some heat pumps can be noisy when the reversing valve shifts the outdoor fan turns off and your indoor electric heaters are energized. Seems like a new sound. Yesterday on a 98 degree day with a cut on temp of 79 with a 5 min delay on compressor to cycle on, it came on and sounded like a very loud ramped up horn inside. This was very annoying and sometimes loud! You might want to turn the power off to your unit and clean the outdoor coil because if the coil is dirty this will cause high pressure in the system. I am sorry to hear that you are having this noisy heat pump problem! I would suggest checking the amperage the compressor is running and make sure the contactor is rated much higher that the RLA (Running Load Amps.) Once the reversing valve has moved to its final destination, it switches the flow of refrigerant. Thanks so much for your interest in our website and the opportunity to do business with you! From what you describe this sounds like you probably have a heat pump unit and the noise that you are hearing is probably the heat pump going into defrost mode. I hope this is the problem because this is normal from a heat pump. What I want to know, is it possible that the valve is stuck half way…. We have UPS Ground, Next Day Air Saver, 2nd Day Air, 3 Day Select and UPS Sure Post shipping options in our shopping cart. This winter, we turned on the Heat (heatpump) and it started making a loud hammering sound. Yes, this could be a thermostat problem, a defrost control, defrost thermostat, low on charge or just real cold outside. The tables below are the lists of possible issues which you may encounter having Goodman heat pump not working. Steve, Your email address will not be published. I do not know if your line set is accessible, but I hope that it is so you can do what I did to fix our noise. With the help of a component called a reversing valve. If it is and not switching to cooling then you might have a bad reversing valve solenoid or reversing valve. Place your order today! My air conditioner’s scroll compressor was vibrating the floor in our home when it was running. Hi Mr. Ramos! Since the contactor went on within a month I would suggest checking the voltage going to the controls in your heat pump outdoor unit. Sometimes a light tap with a rubber mallet on the valve can get the valve to unstick. If the contactor is not getting at least 24 volts AC to the contactor coil then this would cause contactor chatter as cause the contactor to go out prematurely. High side #275 running load amps within range lower than nameplate. Chris, Buckeye Arizona. We Have Promptly Shipped Over 350,000 Orders Since 2002! Steve. We would love to have your business! 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