83 low pressure lockout

You have 2 metering devices on a traditional heatpump system, one at the evap and another at the condenser. The flow of refrigerant is reversed. Very possible for it to appear fine in one mode and not work in the other. There's a check valve so it's not really acting as a metering device during cooling.

If you do all of this and start up system again and it shows 83 code again, you have a bigger issue:-Defrost board issue. -Low charge. -or TXV or piston issue.In addition, when it's this cold, the efficiency of heat pump is very poor. Normally below 30 depending upon the heat pump, it does nit heat well.46 83 Low pressure lockout 84 High pressure lockout Brown out (24V) 53 Outside Temp Sensor FLASH CODE FAULT DEFINITION Thermal Cutout Contactor Shorted 74 No 230V at Compressor 32 Low Pressure Switch 55 Coil Temp Sensor 1. Compressor damage may occur if system is over charged. 2. This unit is factory charged with R-410A in accordance with the ...Thus, the compressor’s low-pressure cutout trips and causes a low-pressure lockout. Inadequate airflow in the indoor unit: Sometimes, the indoor and evaporator coil gets clogged up with dirt. It may happen due to the dirty filters as well. As a result, the indoor unit will not get enough air in the system. This will cause the system to ...Manual Reset Lockout Option Provides "trip-free" low pressure lockout that cannot be overridden or reset until pressure returns to specified level Limited Knob Adjustment Option Restricts control adjustment ranges and deters tampering and over-adjustment P70, P72, and P170 Controls for Low Pressure ApplicationsTraffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent. Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.Carrier infinity system has code 83 low pressure and code 74 are these related in anyway. Technician ordered parts for code 74 but, I am concerned that won’t solve the total issue. Contractor's Assistant: I understand that you're experiencing code 83 low pressure and code 74 on your Carrier Infinity system. Is that correct?

I have a Carrier Infinity Greenspeed heat pump, installed in July-2015, that has a "System Fault" message: "83-Low Pressure Lockout For 4" We are in the middle of a pretty serious snowstorm here in Ma … read morea fault condition such as, for example, low-pressure lockout in the cooling mode may be stored in the memory 135 ( FIG. 1 ) for determining a root cause. ... for example "Fault 83: Low Pressure Lockout for 4 Hours". In 206, controller 130 (FIG. 1) determines a causal relationship between the fault condition and one or more root causes of ...Thermostat calls for heat motor starts at low rpm for few minutes then shuts - Answered by a verified HVAC Technician. We use cookies to give you the best possible experience on our website. ... carrier infinity heatpump gives fault code 83 low pressure lockout for 4 hours. ...The Low Pressure Control is an auto-reset type that opens at approximately 7 psig and closes at approximately 22 psig. COOLING LOCKOUT: If the Low Pressure control opens 3 times during a single call for cooling, the defrost control will enter a Hard Lockout. LOCKOUT RESET: Cycle Low Voltage Power to the Defrost Control.Last couple of days. We had a very low cold spell in NY last week. I noticed the was switching to the furnace an inordinate amount of time. Went to check it, the compressor was locked out. Contractor's Assistant: Is there anything else the HVAC Tech should know before I connect you? Rest assured that they'll be able to help you. That's all.I have id 411. Low pressure switch strikes lockout. Installed july 2017. Lennox elite EP20-024. Jus started about 7 - Answered by a verified HVAC TechnicianMy systems says fault code 83, heat pump, low pressure lockout for 4 hours. What does that mean? Contractor's Assistant: What happened just before your …How do I reset the low pressure switch. Is there a way to reset the low pressure switch. There is airflow on the inside fan coil and I currently have the freon tank attached to fill the system but the compressor wont kick in since it is in lock out from the open pressure switch. There is no reset button that I can find for the low pressure switch.

Ball and Quarter-Turn Plug Valves — Three-Piece Trunnion-Style Ball Valves, 83 and H83 Series — Low Pressure 3-Way Switching. Trunnion-style 83 and H83 series ball valves provide durable service in high- and low-pressure applications. They feature a compact, maximum-flow design, low operating torque, and wide temperature range, and can be ...A lockout is a work stoppage or denial of employment initiated by the management of a company during a labor dispute. In contrast to a strike, in which employees refuse to work, a lockout is initiated by employers or industry owners.. Lockouts are usually implemented by simply refusing to admit employees onto company premises, and may include changing locks or hiring security guards for the ...Good morning. My name is ***** ***** I will be working with you today.The low pressure lock out can be caused by a couple of things. One being low on refrigerant, another being low air flow across the indoor coil and the last being a restriction such as a TXV metering device sticking shut.I'm getting a system alert on my infinity control by carrier. says change the filter then ..83-low pressure lockout 4 hours? the house is getting hot.Will my system come back on? Contractor's Assistant: How old is your Carrier unit? Not sure, just bout my home. Contractor's Assistant: How long has this been going on with your Carrier unit? What have you tried so far?

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You have 2 metering devices on a traditional heatpump system, one at the evap and another at the condenser. The flow of refrigerant is reversed. Very possible for it to appear fine in one mode and not work in the other. There’s a check valve so it’s not really acting as a metering device during cooling.83 Low pressure lockout (4 HRS) 84 High pressure lockout (4 HRS) 85 Low contactor open 87 High contactor open System Communications Failure CONNECT TO R AND Y2 ON CONTROL BOARD * MAY BE FIELD INSTALLED * UC (WITH INFINITY/EVOLUTION ONLY) * SHORT FLASHES DIGIT IN THE STATUS CODE, FOLLOWED BYThe Gmail CAPTCHA is a security device that was put in place to help keep Gmail accounts secure, but you or your employees may need to reset it in the case of an account lockout. ...A low pressure alarm indicates the controller has received an open signal from the normally closed low pressure switch circuit. Three active alarms within one hour will trigger a compressor lockout to protect the refrigerant circuit. The lockout can be cleared by power cycling the controller. The low pressure alarm is bypassed for the first 60s ...Kinins are proteins in the blood that cause inflammation and affect blood pressure (especially low blood pressure). Kinins are proteins in the blood that cause inflammation and aff...Carrier infinity heatpump gives fault code 83 low pressure. carrier infinity heatpump gives fault code 83 low pressure lockout for 4 hours. ...

The compressor lockout balance point is a specific outdoor temperature at which your heat pump will stop operating and your HVAC system will switch to using auxiliary heat. In simpler terms, think of it as a "tipping point." ... AC Compressor Low Pressure Lockout: The Ultimate Guide. How to Adjust the Compressor Lockout Balance Point.I have a 288ANA heat pump and started up the air conditioning for the 1st or 2nd time this year. I was walking by the thermostat and all of a sudden it said it has a system malfunction and these fault codes were listed: 32 - Low Pressure Switch Open - 3 events. 71 - Thermal Cutout in Low Stage - 1 event. 83 - Low Pressure Lockout 4 hours - 1 event.An 04 model 2388 should have the side-mounted rotary screen. Correct refrigerant capacity for those is 6.5 lbs of R-134 refrigerant. Older models with the rear-mounted screen take 4.8lbs. The low pressure alarm trips when the low pressure switch falls below 6 psi for at least 5 seconds. Edited by SDman 8/8/2021 23:41.Dirty filter certainly a cause since it causes low airflow and high pressure in heat mode. Any other cause of low airflow, such as improper blower speed setting, would do it as well. 3 months on a 5" filter is short but if the dust is very fine, that stops up airflow pretty quickly. Reply. 02-25-2013, 05:06 PM #3. heaterman.We have answers. Fulton is a global manufacturer with customer support options available around the world. Whatever your application, we have a local representative who can work with you to find the perfect solution to your heat transfer needs. Find your local rep.The most common reason these stop working is a low refrigerant charge. The unit will typically be going off on a low pressure safety and will need to be pressure checked and re charged. The technician can also add refrigerant dye if the unit is leaking and this will aid in finding the leak as well.Approach Value for Normal Operation - 11 degrees F. Liquid Line Pressure +or-10 / Vapor Line Pressure + or -5 at 85 F - 318/143. Liquid Line Pressure +or-10 / Vapor Line Pressure + or -5 at 95 F - 369/145. Measurements. Geographic Location - Central Florida (Lots of Heat and Humidity) Outside Air Temp - 92 F. Refrigerant Type - R-410A.Carrier infinity heatpump gives fault code 83 low pressure lockout for 4 hours. We start the AC at 76. Outside temp - Answered by a verified HVAC TechnicianLow Pressure Switch 32 Low pressure lockout 83 Internal Board Failure 45 High pressure lockout 84 Brownout on 230V 46 Freeze sensor lockout 86 THIS CONTROL BOARD CONTAINS A FIVE MINUTE SHORT CYCLE PROTECTOR. A FIVE MINUTE DELAY WILL OCCUR BETWEEN COMPRESSOR ON/OFF CYCLES. TO BYPASS …

Low Stage Thermal Lockout : 82: Suction over Temperature Lockout (Elevated from Fault Code 72 after 3 occurrences) 83: Low Pressure Lockout for 4 hours (Elevated from fault code 32 after 3 occurrences) 84: High Pressure Lockout for 4 Hours (Elevated from fault code 31 after stage (speed) can no longer be lowered) 85

RPM necessary to operate inducer in low-heat mode. NOTE: The heat cycle can start in either high or low heat. If a high-heat cycle is initiated, the inducer continues increasing its speed after low-pressure switch closes. When high-pressure switch closes, inducer motor RPM is noted by microprocessor before the 25 sec prepurge period begins. Lockout P70AB-12 MICRO-SETTM Low Pressure Control. The performance specifications are nominal and conform to acceptable industry standards. For applications at conditions beyond these specifications, consult the local Johnson Controls office. ... 83 13/16 20 2-13/16 71 1-11/16 1-3/4 43 44 p70_low_NEMA1_dims.eps Dimensions for Low Pressure ...83 low pressure lockout. Contractor's Assistant: What's the brand and model of your HVAC unit? How old is it? Carrier. Contractor's Assistant: How long has this been going on with your Carrier unit? What have you tried so far? About 4 hours. I replaced the air filter. Contractor's Assistant: Anything else we should know to help you best?Consumer survey findings combined with analysis of 71 million real world chatbot interactions finds efficiency is the common denominator when it c... Consumer survey findings combi...32 Low Pressure Switch 83 Low pressure lockout 84 High pressure lockout 82 Thermal lockout CONNECTION SCHEMATIC DIAGRAM (LADDER FORM) DIAGRAM NOTES: 1. COMPRESSOR AND FAN MOTOR FURNISHED WITH INHERENT THERMAL PROTECTION. 2. TO BE WIRED IN ACCORDANCE WITH NATIONAL ELECTRIC CODE (N.E.C.) AND LOCAL CODES.Customer: ***** ***** Bruno. My Carrier Infinity message is "83-low pressure lockout 4 h". We are in the middle of that Atlantic blizzard with lots of snow. I cleared the snow from the unit outside, b … read moreBoard indicated a low pressure lockout. The first time this occurred I did call an HVAC professional. They checked the refrigerant, coils, pressures and capacitor and said everything looked fine and I probably needed a new thermostat. I ordered a new thermostat, but due to some mannerisms from the tech, decided to check some things.I have id 411. Low pressure switch strikes lockout. Installed july 2017. Lennox elite EP20-024. Jus started about 7 - Answered by a verified HVAC TechnicianCustomer: ***** ***** Bruno. My Carrier Infinity message is "83-low pressure lockout 4 h". We are in the middle of that Atlantic blizzard with lots of snow. I cleared the snow from the unit outside, b … read more

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Lockout P70AB-12 MICRO-SETTM Low Pressure Control. The performance specifications are nominal and conform to acceptable industry standards. For applications at conditions beyond these specifications, consult the local Johnson Controls office. ... 83 13/16 20 2-13/16 71 1-11/16 1-3/4 43 44 p70_low_NEMA1_dims.eps Dimensions for Low Pressure ...Dirty filter certainly a cause since it causes low airflow and high pressure in heat mode. Any other cause of low airflow, such as improper blower speed setting, would do it as well. 3 months on a 5" filter is short but if the dust is very fine, that stops up airflow pretty quickly. Reply. 02-25-2013, 05:06 PM #3. heaterman.Low Stage Thermal Cutout: 72: High Stage Thermal Cutout: 73: Contactor Shorted: 74: Contactor Open (No 230v to Comp) 81: Low Stage Thermal Lockout (4 HRS) 82: High Stage Thermal Lockout (4 HRS) 83: Low Pressure Lockout (4 HRS) 84: High Pressure Lockout (4 HRS)There are several reasons; 1. Pressure Switch is too Old. Yes, the pressure switch can become old and weak. Remember that that switch comprises several delicate parts, including a rubber diaphragm and spring wire. These parts can become worn and unresponsive over time.RESULT: Low Pressure Switch Open. FIX: Low - pressure switch trip. Check refrigerant charge and indoor air flow. CODE: 45. RESULT: Control Fault. FIX: Outdoor unit control board has failed. Control board needs to be replaced. ... FIX: Thermal Lockout occurs in three consecutive high/low stage cycles. High stage locked out for 4 hours or until ...Code 82 -- Thermal lockout in high stage -- 4 hrs. Code 83 -- Low Pressure Lockout -- 4 hrs. Code 84 -- High Pressure Lockout -- 4 hrs. Code 85 -- Low contactor open Code …I have a 2 yr old Carrier Infinity heat pump, 20 SEER, that gave me a system fault of 84, high pressure lockout for 4 hrs. I did have a dirty filter and changed it. Coils are clean, but I can do a qui …Low Pressure Switch. If the low-pressure switch opens for more than five seconds, the control will cause a soft lockout condition and display the appropriate fault codes. If four LPS openings occur within a twelve-hour period, it causes a hard lockout which can be reset by cycling system power, or by shorting the TEST pins for more than …The lockout is not permanent (no 4h lockout/4h lockout.../24hlockout as when pressure was too low), but the HP is working well a few hours and the low …In this video, Tim Smith demonstrates the proper procedure for diagnosing a faulty low pressure cutout (or low pressure switch) on a residential AC.Is the in...I have a Bryant Plus 90i system with a heat pump and received a "Code 83 Low Pressure Lockout 4 Hours" alert. Is this tied to a potential compressor issue in the heat pump unit outside? ... which according to defrost board information is a low pressure lockout.TECHNICAL SUPPORT MANUAL Split System Heat Pump: (H,C,T)CH(6) 4 428 04 170100. R--410A QUICK REFERENCE GUIDE. •R--410A refrigerant operates at 50% -- 70% higher pressures than R--22. Be sure that servicing equipment and replacement components are designed to operate with R--410A. ….

Carrier Infinity System, Code 83-Low Pressure Lockout, ... high blood pressure, drinking and heart pain jumped 33 percent. Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people's questions.Lockout P70AB-12 MICRO-SETTM Low Pressure Control. The performance specifications are nominal and conform to acceptable industry standards. For applications at conditions beyond these specifications, consult the local Johnson Controls office. ... 83 13/16 20 2-13/16 71 1-11/16 1-3/4 43 44 p70_low_NEMA1_dims.eps Dimensions for Low …83 low pressure lockout JA: What's the brand and model of: 2/15/2021 How do I program thermostat model th6320r to activate: 2/15/2021 We have a power outage in Houston. Can a liquid gas: 2/15/2021 How do i switch the continuous fan speed from low to4 flashes is a hard lockout, either due to high or low pressure issues. Most likely a low pressure lockout. Can't remember off the top of my head what 5 flashes is. Sounds to me like you probably have a bad defrost board and/or coil/ambient temperature sensor issues. These sensors rarely, if ever, actually go bad.Low fuel pressure results in several issues for the engine, including rough idle, poor performance and decreased fuel economy. If the pressure is too low, the engine does not start...Ran into a Lennox xp14 heat pump with matching 4 ton cased coil. Kicking out on low pressure fault. Pressure tested the indoor coil and lineset, then the condesor. Held at 400 psi hours. Charged the system back with 410a, and ran in cooling, was getting around 20-30 on the suction side and about 180-190 on liquid side. And the indoor was …Heat Pumps and Electric Home Heating - Low Pressure Lockout + High Pressure Fault Codes: No Heat Pump - My electric bill is very high and found that my heat pump system is using Aux heat full time. I have a 7 year old Lennox 14HPX-036-230-19 outdoor unit; the manual is ** Here ** (1) The compressor/condenser, the red/grHeat pump is on and working as of now and brought room to temp. 1st you need to find out what the actual pressure is. That will tell you if the switch is Bad or Doing its job as designed! If it is running high then correct it. Any # of things can cause excessive head pressure in heat mode.Code 13 – Limit Circuit Lockout Code 14 – Ignition Lockout Code 21 - Gas Heating Lockout Code 22 - Abnormal Flame Proving Signal Code 23 – Pressure Switch Did Not Open Code 24 – Secondary Voltage Fuse Open Code 33 – Limit Circuit Fault AND high heat only is active Code 45 – Control Circuitry Lockout 83 low pressure lockout, I have a Bryant Plus 90i system with a heat pump and received a "Code 83 Low Pressure Lockout 4 Hours" alert. Is this tied to a potential compressor issue in the heat pump unit outside? … read more, I have a fault code 83 low pressure lock out. There is a lot 1/19/2024 1/1/0001; Rheem furnace model R96VA is having low pressure switch 1/6/2024 1/1/0001; High and low pressure switches are open, Eror codes 57 & 45, 12/27/2023 1/1/0001; Mini split no heat. Just installed. No low pressure when 12/17/2023 1/1/0001; I have a pc03 code., 83 Low pressure lockout (4 HRS) 84 High pressure lockout (4 HRS) Short flashes indicate the first digit in the status code, followed by long flashes indicating the second digit of, 108 degree day here and got a 84-high pressure lockout 4 hours in older Carrier system. 84 degrees in house now. Sounds like fan is running, but no fan running on system outside. Of course it's a Sund …, New versions of Google’s Chrome and Mozilla’s Firefox browsers dropped yesterday, and if you haven’t yet updated, now’s as good a time as any: Visit the “About Chrome” or “About Fi..., 5 web i have an infinity 96 heat pump gas furnace temps have been mild here in nc but anyway i received the 84 high pressure lockout 4 hours message i checked my ..., Lockout. The placement of a lockout device on an energy isolating device, in accordance with an established procedure, ensuring that the energy isolating device and the equipment being controlled cannot be operated until the lockout device is removed. Lockout device. A device that utilizes a positive means such as a lock, either key or ..., Lockout P70AB-12 MICRO-SETTM Low Pressure Control. The performance specifications are nominal and conform to acceptable industry standards. For applications at conditions beyond these specifications, consult the local Johnson Controls office. ... 83 13/16 20 2-13/16 71 1-11/16 1-3/4 43 44 p70_low_NEMA1_dims.eps Dimensions for Low Pressure ..., Enhanced performance where (83-57) “VFD Compressor Lockout - Current 1” was erroneously set Version 3.0 (May 2020) ... Enhanced performance for compressor speed …, Low Pressure Switch. The heat pump is equipped with a low-pressure switch which is connected to the control at the LPS terminals. If the low-pressure switch opens for more than five seconds, the control will cause a soft lockout condition and display the appropriate fault codes. The control will ignore the low pressure switch input and not ..., If the pump in your boiler isn't working properly, a boiler lockout is likely to be the result. High/Low water pressure; Your boiler should be operating at a pressure of around 1.3 bar (check your manual for the precise details for your boiler). If this pressure goes up too much or drops too low, your boiler is likely to lockout as a precaution., Held button on side for three seconds now says malfunction alert f=fault low pressure lockout 4 hours 17 events active. Any suggestions brrr it's 4 degrees would hate for it to quit especially w holiday coming up ... our system says system malfunction alert 83 / low pressure lockout 4hrs 3 events active. and the word active is flashing how do ..., Thread: Carrier infinity 25hna - code 83 low pressure lockout 4 hours - cooling mode only. Thread Tools. Show Printable Version; 05-23-2014, 08:34 PM #1. Eric Séguin., Issued September 2018. The P70, P72, and P170 controls for low pressure applications are designed primarily for low-pressure cut-out control, pump-down control, and capacity control on commercial refrigeration and air conditioning applications. These controls are available in several pressure ranges and are compatible with most common refrigerants., The example I use here is a second-stage regulator with an inlet pressure of 10 psig and an outlet pressure setting of 11 in. water column (W.C.). Its lock-up pressure limit is 120 percent (13.2 in. W.C.), with a maximum inlet pressure of 15 psig and a maximum lock-up pressure of 160 percent (17.6 in. W.C.)., What Causes Low Pressure Lockout? Refrigerant Leak. Signs of a Refrigerant Leak. How to Spot a Refrigerant Leak. Blocked or Dirty Filter. Thermal Expansion Valve …, Check that the On/Off switch on the valve is firmly in the ON position 3. Low Inlet Gas Pressure Check for proper gas pressure at the gas valve using a manometer. Natural Gas will be 5-7" water column and Propane with be 11-13" water column. You cna tap into the incoming side of the gas valve and measure incoming pressure there., Page 1: Troubleshooting Guide. Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 1 4 PC 101 Catalog No. 535-754 Printed in U.S.A. Form 58MVP-8SM Pg 1 9-99 Replaces: 58MVP-6SM Tab 6a 8a..., Hi. I keep keep getting lock out messages on both my units. One is a heat pump the other is air conditioner. I also get a similar message in the winter time for the furnace. ... carrier infinity heatpump gives fault code 83 low pressure lockout for 4 hours. ..., Low Stage Thermal Lockout : 82: Suction over Temperature Lockout (Elevated from Fault Code 72 after 3 occurrences) 83: Low Pressure Lockout for 4 hours (Elevated from fault code 32 after 3 occurrences) 84: High Pressure Lockout for 4 Hours (Elevated from fault code 31 after stage (speed) can no longer be lowered) 85, I'm getting a system alert on my infinity control by carrier. says change the filter then ..83-low pressure lockout 4 - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website., From https://www.justanswer.com/ythiJustAnswer Customer from Greenfield, Indiana: 83 low pressure lockoutPearl Wilson: Assistant: What's the brand and model ..., Posts. 2,062. Post Likes. I have seen Yorks lock out because the condenser fan went off on thermals, reset it motors cold runs fine for a few hours. Try putting 1/10 amp fuses in parrellel with the switches in the safty circuit, when one opens it will blow the fuse., If you are having a lockout on low water from the Aquasmart control in your picture, you have one of two issues. Either the control is incorrectly sensing a lack of water in the boiler or the boiler gauge is reading incorrectly, causing you to perceive that there is water in the boiler when there is not. The photo shows enough pressure on the ..., The Low Pressure Control is an auto-reset type that opens at approximately 7 psig and closes at approximately 22 psig. COOLING LOCKOUT: If the Low Pressure control opens 3 times during a single call for cooling, the defrost control will enter a Hard Lockout. LOCKOUT RESET: Cycle Low Voltage Power to the Defrost Control., Aug 23, 2021 · I'm getting a system alert on my infinity control by carrier. says change the filter then ..83-low pressure lockout 4 - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website. , In this video, Tim Smith demonstrates the proper procedure for diagnosing a faulty low pressure cutout (or low pressure switch) on a residential AC.Is the in..., We have a lockout code 82 on out A/C system. The unti is not blowing cold air and it is heating up in the house. It is 94 degrees outside. Contractor's Assistant: Did you double-check the thermostat's settings? And what about the filters? What settings? yes, the "clean return filter" light is on., The Low Pressure Control is an auto-reset type that opens at approximately 7 psig and closes at approximately 22 psig. COOLING LOCKOUT: If the Low Pressure control opens 3 times during a single call for cooling, the defrost control will enter a Hard Lockout. LOCKOUT RESET: Cycle Low Voltage Power to the Defrost Control., If you do all of this and start up system again and it shows 83 code again, you have a bigger issue:-Defrost board issue. -Low charge. -or TXV or piston issue.In addition, when it’s this cold, the efficiency of heat pump is very poor. Normally below 30 depending upon the heat pump, it does nit heat well., Fault Code 71- Thermal cutout in Low Stage occurs when trying to start up in Low Stage. Fault Code 81 - Thermal lockout in Low Stage 4 Hours occurs due to overheat These Infinity systems are not always easy to troubleshoot. In looking at some technical info I see several problems listed..... 1) problem with control board, The P70, P72, and P170 controls for low pressure applications are designed primarily for low-pressure cut-out control, pump-down control, and capacity control on commercial refrigeration and air conditioning applications. These controls are available in several pressure ranges and are compatible with most common refrigerants., 83 low pressure lockout. Carrier. About 4 hours. I replaced the air filter. The unit is about 3 yrs old - Answered by a verified HVAC Technician