83 low pressure lockout

Low pressure lockout can be caused by low air flow across indoor coil, a restriction in refrigerant flow or low on refrigerant. How bad were filters? Ask Your Own HVAC Question. Customer reply replied 4 years ago. My Lennox 14HPX-303 is in low pressure lockout. I disconnected power 10 minutes ago and removed filters.

The compressor lockout is designed to protect the compressor from damage due to low oil levels. When the engine is started, the oil pressure sensor sends a signal to the controller. If the oil pressure is insufficient, the controller will activate the compressor lockout. This prevents the compressor from turning on and protects it from damage.82 Thermal lockout High Pressure Switch 45 83 Low pressure lockout Control Fault 46 53 Outside Temp Sensor Brown out (24V) 84 High pressure lockout FLASH CODELow 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 ...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.Code 81 -- Thermal lockout in low stage -- 4 hrs. 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 86 -- Low contactor shorted Code 87 -- High contactor open Code 88 -- Inverter Temp Lockout or High Contactor Shorted32 Low Pressure Switch 83 Low pressure lockout 84 High pressure lockout 82 Thermal lockout CONNECTION SCHEMATIC DIAGRAM (LADDER FORM) DIAGRAM NOTES: 1. COMPRESSOR AND ...Trane heat pump lockouts. I live in Vancouver,BC and have a 1.5 ton Trane XL13c all electric heat pump. I also have the Trane XL 950 thermostat with outdoor sensor. We recently had 2 cold snaps, with temps of 15-20F. There are 2 bayhtr heat strip backups as well. One of them is 30 amps (105e) and the other is 40 amps (108e).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 have an infinity carrier air conditioner unit that has been reading AC 32-Low Pressure switch open with several different events.

The other zone is not working. I checked the status and it says "Code 83 - low pressure lockout - 4 hours". Mode = Cool, Fan = Auto, A/C = off. Is there anyway I can override this or what should I expect from a service technican. Submitted: 13 years ago. Category: HVAC. Show More. Show Less. Ask Your Own HVAC Question.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) 85Traffic 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.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 the status code. 3, Pause ODU Fan Delay Defeat Not Active 4, Pause 5, Pause 6, Pause ODU Fan Delay Defeat ActiveCarrier infinity heatpump gives fault code 83 low pressure. carrier infinity heatpump gives fault code 83 low pressure lockout for 4 hours. ...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 more

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...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.Oct 25, 2023 · Regular inspection and maintenance of the venting system can help prevent this issue. Improper gas pressure. If the gas pressure in your HVAC system is not set correctly, it can cause the pressure switch to cycle on and off. Low gas pressure can lead to incomplete combustion, while high gas pressure can create excessive pressure in the system. What does a blood pressure reading of 131/83 mean? Readings between 120/80 and 139/89 indicate Pre-Hypertension or High Normal blood pressure. The good news is you don't have hypertension. However, your blood pressure is higher than recommended for most adults. Research suggests that people with pre-hypertension are more likely to have a ...I have a low pressure switch lockout code my my York ac. System only 1 year old. Fan blowing but outside unit is totally off. Contractor's Assistant: Do you know the model of your York AC unit? When did you last replace the air filter? Just changed indoor filters. Think it's an affinity. Paid over $10000 for AC and furnace system

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Call a pro make sure they do a leak check not just charge it up and leave. Thanks! This is very likely the cause. I have this problem every year and they filled the refrigerant last year. You will most likely end up having to replace the coil and maybe the ac depending on the refrigerant it uses.A blood pressure reading of 140/83 can be cause for concern. The first step is to take another reading to confirm your blood pressure. As an aside, home blood pressure monitors are amazingly affordable and great way to stay on top of your blood pressure. So invest in your health and check out Amazon's best rated blood pressure monitors today.Pressure at Transducer has fallen below settings. 50 PSIG for Cooling and 15 PSIG for Heating modes Check Refrigerant Charge Check for Restrictions in liquid or suction lines, drier, strainers etc. Check airflow and load at evaporator A957_O Low Refrigerant Pressure System has tripped the low pressure threshold 3 times in oneLow 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 ordered with ECE R110-type approval. ... Features: Limits access to manually actuated valves; Lockout ...Bryant Evolution Heat Pump. Model 288BNV. Less than 5 years old. Service Technician stated refrigerant was empty. Rescheduled for leak search. Smart thermostat has code 83 low pressure lockout for 4 hours. Is this common? Are refrigerant leaks common? It depends who you ask.1. Check Low Pressure Switch. At the defrost board, check for 24VAC between each "LO-PS" terminal and "C". Power on Both Terminals = Switch Closed → …

Heat Pump Issue: Armstrong Air 4SHP13LE. The outdoor unit runs fine in cooling mode and has been running all summer. I discovered the unit was faulting when I switched it to heat mode. The diagnostic LEDs on the defrost board indicate that the mode is "Low Pressure Switch Lockout". It seems the system is running on Aux Heat when the unit is on ...Carrier infinity heatpump gives fault code 83 low pressure. carrier infinity heatpump gives fault code 83 low pressure lockout for 4 hours. ...Carrier infinity heatpump gives fault code 83 low pressure. carrier infinity heatpump gives fault code 83 low pressure lockout for 4 hours. ... 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 ...82 Hi capacity thermal lockout THERMAL LOCKOUT IN HIGH STAGE 4 HOURS 83 Low Capacity Compressor Lockout LOW PRESSURE LOCKOUT 4 HOURS 84 Hi Capacity …Press and hold the reset button. On the high pressure lockout switch, there should be a reset button. Press and hold this button for about 10-15 seconds. 4. Release the reset button. After holding the reset button for the designated time, release it. 5. Turn on the power. Turn the power back on to the HVAC system.1. Gauges were put on the high and low side. Both high and low pressures were ideal with now low side pressure problems. 2. To eliminate the low pressure switch, it was shorted. WFI manuals say the low pressure switch has to remain open for 30 seconds before lock out. 3. Ohmed out the current sensor.45 82 Thermal lockout Control Fault 46 83 Low pressure lockout 53 Outside Temp Sensor Brown out (24V) 84 High pressure lockout FLASH CODE FAULT DEFINITIONOUTDOOR COIL THERMISTOR Thermal Cutout AUXR Contactor Shorted No 230V at Compressor 32 Low Pressure Switch 55 Coil Temp SensorReadings at or below 83/56 usually indicate low blood pressure or what is called Hypotension. What this means is the blood pressure in your arteries is lower than what is considered normal. However, there's usually no need to be concerned about low blood pressure unless you're experiencing dizziness, fainting, nausea or fatigue.Description. 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: Amber: 84: High Pressure Lockout: When to Get a Technician for KeepRite Air Conditioner Repairs. Although you may be able to effectively diagnose the source of your KeepRite air conditioner's problem, it's typically considered more advisable to contact a certified HVAC technician when it comes to performing the ...

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?

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 ...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 more83 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 BYCarrier 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. read more83 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 BYOctober 22, 2023 by GEGCalculators. The heat pump lockout temperature typically ranges between 30-40°F (-1 to 4°C) in mild climates, 20-30°F (-6 to -1°C) in moderate climates, 10-20°F (-12 to -6°C) in cold climates, and below 10°F (-12°C) in very cold climates. This temperature represents the point at which a heat pump switches to a ...One of the most common causes of high pressure lockout on heat pumps is a clogged condensing coil. The condensing coil is responsible for transferring heat from the refrigerant to the outside air. Over time, dirt and debris can accumulate on the coil, reducing its effectiveness. This reduced effectiveness can cause the pressure in the system to ...High Pressure Switch 45 83 Low pressure lockout Control Fault 46 53 Outside Temp Sensor Brown out (24V) 84 High pressure lockout FLASH CODE FAULT DEFINITION Thermal Cutout AUXR RELAY START CAPACITOR No 230V at Compressor 32 Low Pressure Switch 55 Coil Temp Sensor 56 Thermistor Range ErrorWent off shortly thereafter. Controller says: System Fault 84-High Pressure Lockout 4. Contractor's Assistant: Did you double-check the thermostat's settings? And what about the filters? Filters changed within past month. Thermostat setting has not changed. Set on 76 for cool. ... carrier infinity heatpump gives fault code 83 low pressure ...

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My house has two zones. Carrier units, less than 2 years old. One of the zones is fine. The other zone is not working. I checked the status and it says "Code 83 - low pressure lockout - 4 hours". Mode … read moreLow pressure lockout can be caused by low air flow across indoor coil, a restriction in refrigerant flow or low on refrigerant. How bad were filters? Ask Your Own HVAC Question. Customer reply replied 4 years ago. My Lennox 14HPX-303 is in low pressure lockout. I disconnected power 10 minutes ago and removed filters.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.Readings at or below 83/56 usually indicate low blood pressure or what is called Hypotension. What this means is the blood pressure in your arteries is lower than what is considered normal. However, there's usually no need to be concerned about low blood pressure unless you're experiencing dizziness, fainting, nausea or fatigue.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.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.Heat pump w/electricity at 12 cents per kw-hr, Coefficient of Performance = 3 at 35F ambient: (1,000,000 / 3414 btu per kw-hr) x .12 / 3. = $11.71. In the above example, the heat pump is 35% cheaper than the 80% efficient gas furnace for the same 1 million btu's at 35F ambient. The C.O.P. of the heat pump increases with higher ambient temps.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 …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 … read moreManual 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 Applications ….

HIGH PRESSURE SWITCH LOW PRESSURE SWITCH THERMISTOR (OUTDOOR AIR) THERMISTOR COIL OUTDOOR FAN RELAY OUTDOOR FAN START CAPACITOR START RELAY START THERMISTOR 1. Compressor damage may occur if system is over charged. 2. This unit is factory charged with R-410A in accordance with the amount shown on the rating plate. The charge is adequate forA High Pressure Lockout is indicated by a 3-Flash LED pattern on the outdoor unit control board. X/L Output ... 29 Dec, 2021 Comments: 0. YHE/YHG - Code 5 - Low Pressure - Cooling. York Heat Pump: YHE / YHG Re: Low Suction Pressure - Code 5 (Cooling) CODE 5 = Low Pressure Switch Opened (2x in 6 hours) The heat pump compressor and condenser fan ...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...Low Pressure 2-Way Straight Pattern. 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 ordered with ECE R110-type approval.JustAnswer-Q&A. 7.99K subscribers. Subscribed. 0. 660 views 2 years ago. From https://www.justanswer.com/ythi JustAnswer Customer from Greenfield, Indiana: 83 low pressure lockout Pearl...Low Pressure Lockout = Code 3. The low pressure switch must be open and remain open for 30 continuous seconds during "on" cycle to be recognized as a low pressure fault. If the low pressure switch is open for 30 seconds prior to compressor power up it will be considered a low pressure (loss of charge) fault. The low pressure switch input is ...A Low Pressure Lockout is indicated by the following LED pattern on the defrost board: LED 1 = ON, LED 2 = Flashing. The Low Pressure Control is an auto-reset type that opens at approximately 7 psig and closes at approximately 22 psig. HEATING LOCKOUT: If the Low Pressure control opens 3 times within 120 minutes during a single call for heating ...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 … read more 83 low pressure lockout, 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 more, Jan 4, 2020 · If the low pressure switch trips 3 times within 120 minutes of operation during a particular call for heating operation, the defrost control will lock out compressor and outdoor fan operation. If the lock out due to low pressure occurs at an outdoor ambient temperature below 5°F, the defrost control will automatically exit the lockout mode ... , Unit is a geothermal setup which has been having winter issues since install 5-6 years ago. It would get low pressure lockouts on very cold/freezing days. A tech replaced the low pressure sensor and it worked like a champ all winter, the most efficient it's ever run. Now with warmer weather and switching to cooling and it essentially locks out ..., Most boilers will shut down if the pressure drops below 0.6 bar or higher than 3 bar. You can raise the boiler pressure by filling the filling loop with water. You can also reduce the pressure by bleeding the radiator valves. No power. A power outage can also cause a boiler lockout., 45 82 Thermal lockout Control Fault 46 83 Low pressure lockout 53 Outside Temp Sensor Brown out (24V) 84 High pressure lockout FLASH CODE, Code 83 low pressure lockout. Contractor's Assistant: I'll do all I can to help. How long have you been dealing with this? Last two hours. Contractor's Assistant: Do you plan on doing the work yourself? Yes l do. I work on cars for a living. Contractor's Assistant: Anything else we should know to help you best? Is there a way to start the ..., 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..., The compressor lockout is designed to protect the compressor from damage due to low oil levels. When the engine is started, the oil pressure sensor sends a signal to the controller. If the oil pressure is insufficient, the controller will activate the compressor lockout. This prevents the compressor from turning on and protects it from damage. , 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 ordered with ECE R110-type approval. ... Features: Limits access to manually actuated valves; Lockout accessory enables compliance ..., 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, 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., 25/02/2021 Share this: Facebook Twitter Google+ Pinterest Email to a Friend Facebook Twitter Google+ Pinterest Email to a Friend, Heat 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. , 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..., The 5 ton keeps shutting down with a low pressure lockout. Last time the tech was out, he inserted a temp probe in the ducting just above the coils and noted the temp was 'Not as cold as he would like to see it.' and noticed some frost on the coils. Yesterday I adjusted the dip switches on the furnace and set all thre to the default OFF position., This LED is shared by both the unit Low Pressure Switch and the CA. To determine which caused the lockout, simply look at the CA and determine if it flashing one of the lockout conditions 2, 4, 6, 7." Indeed I've got CA Yellow Flash Code 6: Open Start Circuit - 'Y' tstat demand signal with no current in the start circuit., The Carrier unit do have a low pressure control that shut down unit if charge is low. You need to have your refrigerant charge checked. ... Carrier infinity heatpump gives fault code 83 low pressure. carrier infinity heatpump gives fault code 83 low pressure lockout for 4 hours. ..., Fundamentals of HVAC Low-Pressure Switches. Low-pressure switches in HVAC systems are crucial for detecting pressure drops, preventing equipment damage, and ensuring the thermostat functions properly. Thermostats and low pressure switches come in different varieties, each suited for specific applications., 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..., 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., I have a alert code 411 on my lennox central air unit - low pressure switch strikes lockout. Its an XC25-036-230-01 and - Answered by a verified HVAC Technician, Low refrigerant charge could cause it. If you're running it in cool mode, a bad blower or dirty filter could cause it. Only thing I can advise you to do it turn off the breakers for the indoor and outdoor units for a few minutes, turn it back on, and see if the issue goes away. , Posted 8/9/2021 10:00 (#9154663 - in reply to #9154509) Subject: RE: Case 2388 air conditioning low pressure Thinking those could be possible options. Yes, there is a low pressure port in the cab so I could install the gauges to read low pressure only (no hi pressure port in cab ) and watch in the cab., The shunt termination pin is factory set at 90oC (32oC). (If the shunt is not installed, the default termination temperature is 100 oF). Demand Defrost Control — 100135. Selections are - 50 F, 70 F, 90 F, and 100 F (10oC, 21oC, 32oC and 38oC). The shunt termination pin is factory set at 50oF (10oC)., Hi Guys, I got called out to a Trane voyager the other day that keeps showing a fault of 'compressor 1 locked out' The RTRM board shows the cooling failure indicated by 2 1/4 second flashes. I've checked the safeties including LP but can't seem to find anything that would hold it off. The compressor has been checked and when the contactor is jumped, the compressor runs fine with normal ..., 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., 83 Low Capacity Compressor Lockout LOW PRESSURE LOCKOUT 4 HOURS 84 Hi Capacity Compressor Lockout HIGH PRESSURE LOCKOUT 4 HOURS 85 Low Contactor Open LOW CONTACTOR OPEN 86 Low Contactor Shorted LOW CONTACTOR SHORTED 87 High Contactor Open HIGH CONTACTOR OPEN 88 High Contactor …, Some 25VNA4 and 24VNA6 models contain an additional refrigeration circuit known as a vapor injection circuit. When active this circuit will increase the capacity of the outdoor unit with a minimal increase in power consumption. The result is higher capacity at a …, For high pressure, fine thread cylinders ; Designed to fit most north american high and low pressure gas cylinders, our snap cap device denies access to the main cylinder control and regulator attachment ; Made of welded steel and powder coated for many years of use ; Type of device is cylinder tank lockout, A Low Pressure Lockout is indicated by the following LED pattern on the defrost board: LED 1 = ON, LED 2 = Flashing. The Low Pressure Control is an auto-reset type that opens at approximately 7 psig and closes at approximately 22 psig. HEATING LOCKOUT: If the Low Pressure control opens 3 times within 120 minutes during a …, Low Pressure Lockout = Code 3. The low pressure switch must be open and remain open for 30 continuous seconds during “on” cycle to be recognized as a low pressure fault. If the low pressure switch is open for 30 seconds prior to compressor power up it will be considered a low pressure (loss of charge) fault. The low pressure …, Code 1-3: Indicates that a limit flame switch problem that normally auto-resets after 3 hours. Code 1-4: Represents an ignition problem. However, the furnace will auto-reset after some hours. Code 2-1: This is a sign of gas heating lockout. You need to check if the gas valve wiring is correct., 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.