Some community members might have badges that indicate their identity or level of participation in a community. OK, thanks. The aux heat wire is connected to W2 Aux. 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. How to override outside temperature lockout for (cooling) compressor? 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 ". On occasion, a home air conditioning system will fail to come on at the beginning of the season or after a power outage. If so, turning it OFF can do the trick. http://hvac-talk.com/vbb/showthread.php?t=1241, http://hvac-talk.com/vbb/showthread.php?t=116113. Normally this is caused by making a bunch of adjustments back-to-back. In other words if your aux lockout doesn't go lower than 40 degrees then your compressor lockout is set at 30 degrees. 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. If it seems to be helpful, we may eventually mark it as a Recommended Answer. How do you unlock a Emerson thermostat? Recently replaced my Honeywell stats (split system) with Nest stats (upstairs/downstairs). If it says "In 2 hours" that is Nest's Time-to-Temp algorithm. The compressor is only for cooling, as I have natural gas for the heating side. ... or will the Nest prevent the cooling from running in operation mode as well? Honeywell has thermostats that also let you determine the lock out temps for aux and heat pump. Too much refrigerant. Before you call a professional, take a few minutes and follow a … The lockout temperature cannot be overridden but it can be changed. Yes, to get the settings I posted I have to turn off "Balance", to be specific "Nest Sense" is off. I had Nest support go through this with me and he just went off "Nest Sense" and to manual system where I set the compressor lockout to 30F. Compressor Damage. 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. We are experiencing longer than normal wait times for support. Our 20th year anniversary is May 21, 2020. This option can be found under the Nest Sense setting. When you submit a report, we'll investigate it and take the appropriate action. Thread: Nest Thermostat and Compressor Lockout? 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. You can view them via the “Settings->Technical Info” menu on the Nest itself or … Low refrigerant charge. It shuts off the compressor and uses only AUX heat when the outside temp is below this number. The user interface provided by the Nest thermostat differs from the Nest website and iOS/Android apps. Basically automation is part of a subject called control systems. 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. This will remove the reply from the Answers section. Me: So if the thermostat normally calls for cooling, it will turn to cool even if the outside temperature is low? When I moved in, the heat pump compressor lockout (thermostat setting 0350) was set at 35 degrees. 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. Account & Lists Sign in Account & Lists Returns & Orders. Why Nest thermostat is short cycling the AC And they are wifi also. How to override outside temperature lockout for (cooling) compressor? Yes, I'm new to this and still evaluating. Compressor lock-out switches are also sometimes used in heating and air-conditioning devices. As I installed a Thermostat E it would not allow me to test cooling (the compressor) because the outside temperature was below 60F. Check if the Air wave option has been turned ON. In other words if your aux lockout doesn't go lower than 40 degrees then your compressor lockout is set at 30 degrees. Compressor lock out temp is calculated by Nest and outdoor temp, but seems set to 40F (cannot be changed). Nest thermostats are usually compatible with whole home humidifier and dehumidifier systems that connect to your thermostat with one or two low-voltage wires. Another Type of Lock Out Switch. Also, both the heat pump and the electric backup run on very short cycles. I stillhave the old stats so I could just re-install them. Electrical problems. I have a NEST thermostat and for some reason it is not turning on our air conditioner. Compressor Minimum Cycle Off Time: The amount of time the compressor remains off between cycles. Ask Our Pros-Owner Assistance - NO DIY advice will be given. There may be a compressor lockout. 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 … 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. Last summer I installed a customer supplied Nest thermostat. Go to the Legal Help page to request content changes for legal reasons. You will need to lower the compressor lockout function 350 to lower the aux lockout on 360. I just thought I'd get better HVAC management - guess not. You will lose what you have written so far. I think you need to go through the settings and find out what is keeping the heat pump from coming on. The minimum is -25, and you can adjust it up to 32. 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. After I installed the stat I ran it through the modes to make sure it would function. Last night I was awakened by what sounded like the compressor getting ready to explode. Participate in over 40 different forums and search/browse from nearly 3 million posts. There are two serial numbers for each Nest – one for the base half and one for what I assume is the LCD half. 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. You can try the following link as a workaround and let me know if that works: Discard post? Yes... we are 20 years old. This reply will now display in the answers section. This option can be found under the Nest Sense setting. No problems with heat or cool until this morning. Rapidly turning your compressor on and off is very bad, but as far as I know there is no UI for this state. 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. 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 Our automated system analyzes replies to choose the one that's most likely to answer the question. If anybody else has experience this and can confirm, please post. Post photos, respond to polls and access other special features. Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. There may be a compressor lockout. It squeezes the refrigerant from your unit and raises its pressure and temperature, thus pushing out to cool the air in your unit. 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. Why Nest thermostat is short cycling the AC 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. Snowflake and Flame are displayed (flashing) if the thermostat is in lockout mode to prevent the compressor from cycling too quickly. 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. If you have a heat pump system, place it into the O/B terminal. When the temperature approaches 35 degrees, the heat pump runs less than 25% of the time, even at night. In this case, replacing the compressor is a good solution. The default is always use. If you haven’t purchased a Nest thermostat, use the Compatibility Checker to tell if your system can work with a Nest thermostat. Thank you. Delayed is protecting your compressor, and should be on the order of minutes. By default Nest will activate the heat pump balance, which then automatically determines the aux heat lockout temperature. Locate any unconnected wire labeled W or W1. If so, turning it OFF can do the trick. Why does my nest say aux heat? Community content may not be verified or up-to-date. Assistance with NEST/emergency heat/AUX lockout Not sure if anyone can assist but I have a small question. 1 Like seannymurrs (Sean Murray) November 5, 2014, 12:31pm You will need to lower the compressor lockout function 350 to lower the aux lockout on 360. I’ve provided two ways to do it. 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. “I haven’t failed. Blocked suction lines. This is set to 300 seconds (5 minutes) by default. This is set to 300 seconds (5 minutes) by default. 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. Connect your Nest Thermostats, Nest Cams, Nest Doorbell, or Nest devices and add Nest … These switches are not designed for safety considerations, but rather to keep the units from heating or cooling to a wasteful or unnecessary extent. So my heat pump is having issues and needs to be serviced so I need to use aux heat(my furnace) exclusively. Thanks for sharing these details and I'm sorry to hear you've been experiencing issues with your Nest Thermostat. These are the common issues that cause AC compressor failure: Dirty coils. There are two different lockout temperatures that are set on the Nest. Components – Coils, Heaters, Motors, etc. Nest set to "Nest Sense" either "Balanced" or "Max Savings". Skip to main content Hello, Sign in. Does this apply to the cooling compressor as well? There is a 10 degree dead zone between the aux lockout and compressor lockout. Realize that if it is not coming on, then something is stopping it. I’ve just found 10,000 ways that won’t work.” - Thomas Edison. Contaminants in the system. Post contains harassment, hate speech, impersonation, nudity; malicious, illegal, sexually explicit or commercial content. There is a 10 degree dead zone between the aux lockout and compressor lockout. You will lose what you have written so far. ... You want to set the compressor lock out temp high also so it never tries to run it. Post is disrespectful, about third party products or contains unrelated content or personal information. 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). In this video we go over the heat pump balance feature in the programming of the NEST thermostat. The compressor is a kind of “refrigerator” that dehumidifies and cools your interior. Your notifications are currently off and you won't receive subscription updates. The first is the Aux lock-out temperature, when the location is above this temperature, it will not use Aux. Both options are untested, as I only have one nest. Nothing could get the fan to turn in other than heat mode. and your burning more electric...........Makes them happy! With this extreme cold, however, I've hit a problem. Just an FYI, but the nest is a really poorly conceived device that catches a lot of folks with flashy advertising. ... For instance, you'll see the Nest Leaf to let you know that you've selected an energy-saving temperature. 6 Indicates a malfunction with the system. The idea is that you have a control parameter(in our case temperature) and […] 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 ). You'll receive email notifications for new posts at. Nest was a 1/2 off promotion from my electric company. 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. If your compressor lockout is 30° and the outdoor temp is 25° the compressor will not operate. 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. Our automated system analyzes the replies to choose the one that's most likely to answer the question. For example, “–index 1” to use the second nest. Dan A (Nest): Yes, it will allow ti cool after skipping the test. Beside above, can you drive with a locked up AC compressor? https://support.google.com/googlenest/answer/9249790?hl=en. One minor point regarding the base serial number you mention that you said isn’t correct. Heat pump compressor lockout temperature? 55°F Compressor Lockout Cooling Thermostat - - Amazon.com. It seemed to work fine. Failed to attach file, click here to try again. To turn them on, go to. We'll get back to you only if we require additional details or have more information to share. Inadequate oil lubricant. Because of the outside temperatures. Check if the Air wave option has been turned ON. Incorrect suction line size. Page 24 Heat Pump: Both auxiliary and compressor lockout temperatures can be changed in the Heat Pump section of the Advanced Settings menu. I've had my Nest for 2 years now and generally it does what I want. There are two different lockout temperatures that are set on the Nest. Sign in to the Nest app in your web browser with your Google Account or non-migrated Nest Account. If you don’t know your system type, place this wire into the W terminal. 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. 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. One is to use the “–index” argument. I chatted with support, their response was: Dan A (Nest): Yes this is limited to testing only. The #1 question asked by NEW MEMBERS. Details. 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). Are you sure you want to continue? 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". When it is damaged, it will usually switch on … I have a pretty standard forced air system, with gas for heating and standard a compressor for cooling. 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. Show Printable Version; 02-02-2019, 04:25 PM #41. pecmsg. 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. 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. The Thermostat belongs to me. A heat pump runs your compressor for both heating and cooling. We're committed to dealing with such abuse according to the laws in your country of residence. 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Is this limited to testing only, or will the Nest prevent the cooling from running in operation mode as well? You need to exit out of the System test before changing the the lockout temperature. In this video we go over the heat pump balance feature in the programming of the NEST thermostat. In this case, replacing the compressor is a good solution. Try Prime Cart. 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. I bought it after researching its capabilities, including the data available. 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. Thread Tools. We appreciate your patience and understanding during this time. It is on a split system Trane heat pump. Google takes abuse of its services very seriously. 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