A heat pump runs your compressor for both heating and cooling. This will remove the reply from the Answers section. We found the following personal information in your message: This information will be visible to anyone who visits or subscribes to notifications for this post. If you don’t know your system type, place this wire into the W terminal. Nest was a 1/2 off promotion from my electric company. These are the common issues that cause AC compressor failure: Dirty coils. The Thermostat belongs to me. Connect your Nest Thermostats, Nest Cams, Nest Doorbell, or Nest devices and add Nest … For Nest users who have migrated to a Google Account, the Nest Web APIs work only when the home.nest.com session stays active (you should not log off from your active session, but you can close the browser or turn off desktop/mobile ). When you submit a report, we'll investigate it and take the appropriate action. After I installed the stat I ran it through the modes to make sure it would function. I think you need to go through the settings and find out what is keeping the heat pump from coming on. When I moved in, the heat pump compressor lockout (thermostat setting 0350) was set at 35 degrees. Both options are untested, as I only have one nest. The minimum is -25, and you can adjust it up to 32. Yes, I'm new to this and still evaluating. The second is the heat pump lock out temperature, when the location is below this temperature, it will not use the heat pump, and just use Aux. Electrical problems. Honeywell has thermostats that also let you determine the lock out temps for aux and heat pump. Yes, to get the settings I posted I have to turn off "Balance", to be specific "Nest Sense" is off. Why Nest thermostat is short cycling the AC Skip to main content Hello, Sign in. The system seems to be running the heat pump down to the teens or below and when the unit ices up it must be running in reverse to try to de-ice. In modern days where automation has reached the residential and is no longer the norm of only industries and factories there are certain terms or technical jargon that people still struggle with. 55°F Compressor Lockout Cooling Thermostat - - Amazon.com. and your burning more electric...........Makes them happy! We'll get back to you only if we require additional details or have more information to share. Compressor Minimum Cycle Off Time: The amount of time the compressor remains off between cycles. As I installed a Thermostat E it would not allow me to test cooling (the compressor) because the outside temperature was below 60F. One area of my house is specifically troublesome (lots of direct sunlight with many windows) and will get above desire temperature even with outside temperatures of 30-40, and the cooling should be allowed to run. Components Coils, Heaters, Motors, etc. Post contains harassment, hate speech, impersonation, nudity; malicious, illegal, sexually explicit or commercial content. I have just begun using the new Device Access API, and I find the list of traits returned for the Nest Thermostat to be extremely limited compared with what Nest provided when I purchased my Thermostat before Google took over. On occasion, a home air conditioning system will fail to come on at the beginning of the season or after a power outage. When the temperature approaches 35 degrees, the heat pump runs less than 25% of the time, even at night. 6 Indicates a malfunction with the system. This option can be found under the Nest Sense setting. OK, thanks. How to override outside temperature lockout for (cooling) compressor? Last summer I installed a customer supplied Nest thermostat. We're committed to dealing with such abuse according to the laws in your country of residence. This is set to 300 seconds (5 minutes) by default. Thanks for sharing these details and I'm sorry to hear you've been experiencing issues with your Nest Thermostat. The compressor is only for cooling, as I have natural gas for the heating side. These switches are not designed for safety considerations, but rather to keep the units from heating or cooling to a wasteful or unnecessary extent. You will lose what you have written so far. Accordingly, what causes compressor lockout? To turn them on, go to. Community content may not be verified or up-to-date. You will lose what you have written so far. I’ve provided two ways to do it. Delayed is protecting your compressor, and should be on the order of minutes. In other words if your aux lockout doesn't go lower than 40 degrees then your compressor lockout is set at 30 degrees. If you have a heat pump system, place it into the O/B terminal. One minor point regarding the base serial number you mention that you said isn’t correct. ... For instance, you'll see the Nest Leaf to let you know that you've selected an energy-saving temperature. Contaminants in the system. There are two different lockout temperatures that are set on the Nest. If your compressor lockout is 30° and the outdoor temp is 25° the compressor will not operate. The first is the Aux lock-out temperature, when the location is above this temperature, it will not use Aux. If so, turning it OFF can do the trick. In this video we go over the heat pump balance feature in the programming of the NEST thermostat. It seemed to work fine. For heatpump systems, its also crucial to know and set the minimum outdoor temperature that the heat pump can run with - otherwise the thermostat will lock out the heatpump and change over to aux heat as the weather outside will be too cold to run the heatpump unit that's sitting outside. Me: So if the thermostat normally calls for cooling, it will turn to cool even if the outside temperature is low? If anybody else has experience this and can confirm, please post. I stillhave the old stats so I could just re-install them. Before you call a professional, take a few minutes and follow a … Are you sure you want to continue? If so, turning it OFF can do the trick. Realize that if it is not coming on, then something is stopping it. And they are wifi also. How do you unlock a Emerson thermostat? In this video we go over the heat pump balance feature in the programming of the NEST thermostat. Nothing could get the fan to turn in other than heat mode. Check if the Air wave option has been turned ON. Now you come to the setting: "Use the heat pump compressor when the outside temperature is above" This is the compressor lockout option that you cannot set from within the app. In this case, replacing the compressor is a good solution. Post is disrespectful, about third party products or contains unrelated content or personal information. Nest 3rd gen model will turn ON the aux heat system only when it is necessary (only when the outside temperature falls below the aux heat lockout temperature). Compressor lock out temp is calculated by Nest and outdoor temp, but seems set to 40F (cannot be changed). Our 20th year anniversary is May 21, 2020. It shuts off the compressor and uses only AUX heat when the outside temp is below this number. There may be a compressor lockout. Participate in over 40 different forums and search/browse from nearly 3 million posts. http://hvac-talk.com/vbb/showthread.php?t=1241, http://hvac-talk.com/vbb/showthread.php?t=116113. Snowflake and Flame are displayed (flashing) if the thermostat is in lockout mode to prevent the compressor from cycling too quickly. Your notifications are currently off and you won't receive subscription updates. Too much refrigerant. Compressor lock-out switches are also sometimes used in heating and air-conditioning devices. In other words if your aux lockout doesn't go lower than 40 degrees then your compressor lockout is set at 30 degrees. I have a pretty standard forced air system, with gas for heating and standard a compressor for cooling. You need to exit out of the System test before changing the the lockout temperature. Why Nest thermostat is short cycling the AC Compressor Damage. 1 Recommended Answer 4 Replies 0 Upvotes I have a pretty standard forced air system, with gas for heating and standard a compressor for cooling. I bought it after researching its capabilities, including the data available. I havent failed. Thank you. Recently replaced my Honeywell stats (split system) with Nest stats (upstairs/downstairs). Just an FYI, but the nest is a really poorly conceived device that catches a lot of folks with flashy advertising. In this case, replacing the compressor is a good solution. Yes... we are 20 years old. The temperature below which you want to use Auxiliary heat (rather than the heat pump compressor) is referred to as the "Compressor Lockout" setting in the website and app interfaces. So, you have separate unit for heating and a separate unit for Cooling and therefore your system is not a Heat pump system but a conventional system. ... You want to set the compressor lock out temp high also so it never tries to run it. The thermostat shall have a compressor outdoor lockout and backup heat outdoor lockout to turn off the heat pump or backup heat based on outdoor temperature. Our automated system analyzes replies to choose the one that's most likely to answer the question. Thread Tools. If you haven’t purchased a Nest thermostat, use the Compatibility Checker to tell if your system can work with a Nest thermostat. There may be a compressor lockout. This is set to 300 seconds (5 minutes) by default. Yes, so far I'm disappointed with Nest as I thought it's "brain" would work out the best settings - but I will say that those compressor on and aux on settings are far more adjustable than my old Honeywell. 1 Like seannymurrs (Sean Murray) November 5, 2014, 12:31pm Ask Our Pros-Owner Assistance - NO DIY advice will be given. Another Type of Lock Out Switch. Assistance with NEST/emergency heat/AUX lockout Not sure if anyone can assist but I have a small question. The more reliable way is probably to use the “–serial” argument, as this would be tolerant if nest ever changes the ordering of the thermostats in the list. Check if the Air wave option has been turned ON. It is on a split system Trane heat pump. Thread: Nest Thermostat and Compressor Lockout? By default, Nest will lock out the Setting compressor and auxiliary heater when the outdoor temperature is above 50°F but will not lock out auxiliary lockout temperatures the compressor at any temperature. Also, both the heat pump and the electric backup run on very short cycles. Account & Lists Sign in Account & Lists Returns & Orders. For example, if your AUX lockout temp is 40ºF or 4.4ºC, then AUX heat will come on when the outdoor temperature drops below 40ºF or 4.4ºC. Which is just another one of the many reasons you should hire a nest professional installer.On average approximately 3-10 out of 100 people have existing issues with their furnace that has nothing to do with the nest thermostat or their existing thermostat for that mater that can create problems when you go to install a new thermostat. Ive just found 10,000 ways that wont work. - Thomas Edison. This option can be found under the Nest Sense setting. Some community members might have badges that indicate their identity or level of participation in a community. The lockout temperature cannot be overridden but it can be changed. View Profile View Forum Posts View Forum Threads Professional Member* Join Date Aug 2002 Location Southold, NY Posts 30,669 Post Likes Originally Posted by pieatro. Accessories Pumps, Cooling Towers, Evap Condensers, etc, Components Valves, Motors, Condensers, Evaporators, etc, Duct Systems Design, Installation & Practice, Piping Systems Design, Installation & Practice, Control System Design, Installation & Practice, Welcome from the Editor & Electrical Forum Rules, Pro's Forum: National Electrical Code (NEC), Pro's Forum: Calculations & Electrical Theory, Pro's Forum: Electrical Business & Marketing. There are two different lockout temperatures that are set on the Nest. Details. Incorrect suction line size. Blocked suction lines. We are experiencing longer than normal wait times for support. You can view them via the “Settings->Technical Info” menu on the Nest itself or … One is to use the “–index” argument. The compressor timer lockout mav prevent the air conditioner from turning on, for a period of time: The display is blank: Lack of proper power: Make sure power is turned on to the furnace and that you have 24vac between R & W. If C is used, 24vac between R & C: The air conditioning does not attempt to turn on: The cooling setpoint is set too high Locate any unconnected wire labeled W or W1. Please visit the link: https://support.google.com/googlenest/answer/9248719?hl=en, to change the lockout temperature, under the section "How to change Heat Pump Balance settings". No problems with heat or cool until this morning. The temperature below which you want to use Auxiliary heat (rather than the heat pump compressor) is referred to as the "Compressor Lockout" setting in the website and app interfaces. But on the Nest Thermostat itself, the term "Lockout" is not used, instead you see " Use the heat pump compressor when the outdoor temperature is above ". Beside above, can you drive with a locked up AC compressor? You will need to lower the compressor lockout function 350 to lower the aux lockout on 360. 2 High Discharge Temperature Td >268F,Reset Td<250, Lockout on 5th 3 Compressor Protector Tripped Detect using current 4 Locked Rotor Lockout on 4th successive locked rotor trip 5 Demand Signal Loss Capacity Req < 0.5VDC, shut down 6 Discharge Thermistor Fault … You'll receive email notifications for new posts at. How to override outside temperature lockout for (cooling) compressor? Page 24 Heat Pump: Both auxiliary and compressor lockout temperatures can be changed in the Heat Pump section of the Advanced Settings menu. It squeezes the refrigerant from your unit and raises its pressure and temperature, thus pushing out to cool the air in your unit. Because of the outside temperatures. You can try the following link as a workaround and let me know if that works: Discard post? The default is always use. Google takes abuse of its services very seriously. Failed to attach file, click here to try again. Compressor and Auxiliary Heat Lockout Temperatures for Heat Pumps Requires Wi-Fi: Both auxiliary and compressor lockout temperatures can be changed : The lockout temperatures are only enforced when the Nest Thermostat is connected to Wi-Fi so it can track outdoor temperatures. Our automated system analyzes the replies to choose the one that's most likely to answer the question. 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Post photos, respond to polls and access other special features. Low refrigerant charge. If it says "In 2 hours" that is Nest's Time-to-Temp algorithm. Last night I was awakened by what sounded like the compressor getting ready to explode. By default Nest will activate the heat pump balance, which then automatically determines the aux heat lockout temperature. Nest set to "Nest Sense" either "Balanced" or "Max Savings". Is this limited to testing only, or will the Nest prevent the cooling from running in operation mode as well? The aux heat wire is connected to W2 Aux. Nest Learning Thermostat 3rd gen. model is the only smart thermostat on the market right now that supports up to 3 stages of heating (the rest stop at 2). The #1 question asked by NEW MEMBERS. Inadequate oil lubricant. The user interface provided by the Nest thermostat differs from the Nest website and iOS/Android apps. Rapidly turning your compressor on and off is very bad, but as far as I know there is no UI for this state. Why does my nest say aux heat? So my heat pump is having issues and needs to be serviced so I need to use aux heat(my furnace) exclusively. Does this apply to the cooling compressor as well? Dan A (Nest): Yes, it will allow ti cool after skipping the test. Nest thermostats are usually compatible with whole home humidifier and dehumidifier systems that connect to your thermostat with one or two low-voltage wires. The nest itself switches to away mode when I tap the “Present” button, but the button does not toggle in the app, and pushing the button again does not switch the Nest back to home mode. I've had my Nest for 2 years now and generally it does what I want. The second is the heat pump lock out temperature, when the location is below this temperature, it will not use the heat pump, and just use Aux. Sign in to the Nest app in your web browser with your Google Account or non-migrated Nest Account. Show Printable Version; 02-02-2019, 04:25 PM #41. pecmsg. https://support.google.com/googlenest/answer/9249790?hl=en. Go to the Legal Help page to request content changes for legal reasons. The compressor is a kind of “refrigerator” that dehumidifies and cools your interior. There is a 10 degree dead zone between the aux lockout and compressor lockout. You will need to lower the compressor lockout function 350 to lower the aux lockout on 360. Normally this is caused by making a bunch of adjustments back-to-back. Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. There are two serial numbers for each Nest – one for the base half and one for what I assume is the LCD half. Basically automation is part of a subject called control systems. I just thought I'd get better HVAC management - guess not. The idea is that you have a control parameter(in our case temperature) and […] We appreciate your patience and understanding during this time. If it seems to be helpful, we may eventually mark it as a Recommended Answer. When there is a demand, Nest calls for cooling and immediately the compressor kicks ON only to turn off within 30-45 seconds (without meeting demand) the fan stays on and then compressor kicks on after about 30-45 seconds, sometimes this is all it does but most of time this process repeats 3-4 times before it stays on to meet demand. I chatted with support, their response was: Dan A (Nest): Yes this is limited to testing only. There is a 10 degree dead zone between the aux lockout and compressor lockout. ... or will the Nest prevent the cooling from running in operation mode as well? Heat pump compressor lockout temperature? I have a NEST thermostat and for some reason it is not turning on our air conditioner. 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It into the O/B terminal turn to cool the air in your country of residence base half and one the! Minor point regarding the base half and one for what I assume is the LCD half?.. Number you mention that you said isn ’ t know your system,! Both the heat pump system, place this wire into the O/B.!, 04:25 PM # 41. pecmsg in lockout mode to prevent the cooling from running operation... 20Th year anniversary is may 21, 2020 I moved in, the heat pump runs than... Heat ( my furnace ) exclusively Balanced '' or `` Max Savings '' LCD... See the Nest Sense setting approaches 35 degrees, the heat pump and the temp... Device that catches a lot of folks with flashy advertising explicit or commercial content so.. These are the common issues that cause AC compressor section to get real answers for your questions do it that. This state more electric........... Makes them happy t know your system type place.