I just turned it on for the start of the season a couple days ago. Replaced the TXV and the system returned to normal operation. why doesn’t the compressor come back on after going off on high head pressure. Compressor kicks on and runs for 3-4 minutes and the high pressure trips. No vacuum was pulled. Most HVAC systems are designed for a maximum outdoor ambient temperature of 95° F. So, if the temperature is at or above 95° with high humidity, then you will likely also experience high head pressures. Verify water pump is on. Maybe it won’t turn on, or it no longer heats up appropriately. There is so much to learn. I'm suspecting a clogging TEV or a clogging valve on the compressor itself. Medallion Energy 151 Baywood Ave. Longwood, FL 32750 407-786-0000 . On heat pumps the indoor coil becomes the condenser in the wintertime and if you are not getting enough airflow across the indoor coil it with cause the high-pressure code problem. If the tech was convinced that the blockage was at the condensing coil it would be reasonable to replace it. Heat pump problems can be frustrating (and expensive). I’d think a TXV closing would cause high side to go up and low side to fall. If your air conditioning or heat pump system has lost its cooling capacity or won't start. This is the most common problem I have found that causes compressors to trip on high head pressure. Hopefully, the homeowner will fess up like mine did when I found the non-condensing gases problem, and you will be able to solve the problem much quicker. Maybe, Tim. Non-Condensing Gases in the Refrigeration System | High Head Pressure Air Conditioner Heat Pump, Refrigerant Overcharge | High Head Pressure Air Conditioner Heat Pump, Conclusion | High Head Pressure Air Conditioner Heat Pump, Refrigeration and Air Conditioning Technology, Air Conditioner Compressor Troubleshooting, Air Conditioning and Heating Heat/Energy Values, Evaporator Coil for Heat Pumps & Air Conditioners, Evaporator Coils Dirty Ice On Air Conditioner, High Head Pressure Air Conditioner Heat Pump Troubleshooting, Proper Refrigeration Piping Installation Practices, Semi-Hermetic HVAC Compressor Rebuild Shop, The Condenser in the Refrigeration Process, An essential troubleshooting list of things that cause high head pressure, The Line set and crucial devices in the line set, Extreme operation above design specifications, Watching Television - 400 BTU/h (any sedentary activity), Cleaning the house - 700 BTU/h (moderate activity), Mowing the Grass w/push mower - 1800 BTU/h (heavy activity), Running a marathon - 2400 BTU/h (extreme activity). When the WATER FLOW light is on, this signals that internal freezing conditions have occurred. The condenser fan motor and the condenser coils are the most common problems I have found with the issue of high head pressure. This category only includes cookies that ensures basic functionalities and security features of the website. This website uses cookies to improve your experience. At first, they were pretty good at playing dumb, but then the wife fessed up and told me what they did. Follow the lines and components and see if there is a distinguishable temperature difference from one part to another. I’m having an odd problem where I’m getting a high pressure lockout code at the roughly the same time each morning. To be a good technician is not pap and meat Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. This way, you can enjoy the energy efficiency of a heat pump without having to replace your entire system. He guessed and bled some charge. In any heat pump you will generally find one high-pressure and one low-pressure switch. Usually, a few degrees is okay. With power off you can test that HPCO with a meter. We have cleaned all pipes and flow is normal (even those internal Jandy). The system is working hard to remove not only the sensible heat load but also the latent heat load so the pressures will be high in those conditions. UPDATE: The problem was a failed thermistor in the garage furnace. Coolant pressure too high Heat consumption of heating circuit is too low. I learned last night that the system had to be recharged 7 years ago and all they did was add freon. May stop or fold back compressor RPM Check Outdoor fan operation Check Condenser coil for cleanliness Check Drive Heat Sink Yellow 4 or 18 Flashes T909_O Inverter Fault – PFC Over-temp This was installed by people chosen to do so by the builder. The unit displayed a high pressure lockout fault, so I went ahead and cleaned the filter as we have had a ton of pollen lately and I knew flow was crucial for the heat pump operation. I attended a two day a week course 96 credit hrs at Albemarle College. Shouldn’t I insist the HP switch be replaced? Otherwise, you are just guessing. I would bet its a restriction somewhere and likely the TXV. Check refrigerant charge and indoor air flow. To save you time, money and frustration, the experts at Carrier have put together a quick heat pump troubleshooting guide. When the system ran just before it gave up the ghost, there was no ice or even condensation on or around the TXV (found correct name). Check the air filters, as these can get dirty, and this will cause the pump to stop working. It takes all of life, Technical Resource: Refrigeration and Air Conditioning Technology. We have cleaned all pipes and flow is normal (even those internal Jandy). It could come from the accumulation of heat from a poorly functioning condenser unable to throw off the heat the system is picking up and many other reasons including overcharging the refrigerant. We found that the source side pressure was down to 2 psi perhaps due to a leak outside in the geothermal field. • GPM: Pressure Differential between Water In and Water Out at unit coax. + Check injection pressure during start-up (Value for High Heat) + Remove the air from the Gas pipe-work + Adjust the injection pressure to high heat value. This time, it didn't even reach 50 degrees Fahrenheit outdoors all day long. Fault Condition: HIGH REFRIG Alarm: Refrigerant high pressure switch is open. I had a tech read the pressures and he said they were fine (this wasn’t at 4 am though when the error happens). I want to say thank you very much for this page. It turned out that the high pressure switch/sensor on the hot gas line would not auto reset like it was supposed to. Like all appliances, your heat pump may sometimes have trouble working correctly. They bought the unit online and decided to install it themselves to save money. Systems is few months old and goes into high pressure lockout (code L2) on the heat pump. Alternatively, maybe your heat pump doesn’t cool down after use, or it runs constantly. Crimped copper lines can also cause restrictions. High Pressure fault - fouled or scaled water coil: Check for proper flow rate and water temperature, but low water side temp rise in cooling. Possible Cause: 1. Some of the initial and essential things to look at when troubleshooting high head pressure include the condenser fan motor working and operating at the proper RPM’s and clean condenser coils. It keeps triggering the high-pressure cut-off on the outdoor unit. for evaluating the condition of the air conditioner compressor motor, which in turn, is a step in how we evaluate 2. Check supply voltage to the heat pump. Too little freon, clogged TEV, 6 degree drop from intake to output, and still pop high head pressure? Started Saturday. Troubleshooting Guide Alarm high pressure Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. Check to see if a phase is out. In order to take heat out of the air, the refrigerant inside the heat pump's evaporator tubes must be about 10 to 15°F COLDER THAN THE AIR so at about 42 to almost 50°F (5°C) air temperature the heat pumps outside coil is approaching 32°F (FREEZING-0°C) and any moisture in the air will begin to FREEZE on the coil and ice it up. These cookies will be stored in your browser only with your consent. Gas Heating Troubleshooting and Repair Index, High Head Pressure Air Conditioner Heat Pump. When first encountering the problem of high head pressure, it is essential to check the basics first. - original source: www.achrnews.com/articles/107725-the-professor-air-conditioning-system-troubleshooting, Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the, "Air Conditioning & Refrigeration I & II", BOCES Education, Warren Hilliard (instructor), Poughkeepsie, New York, May - July 1982, [classroom notes from air conditioning and refrigeration maintenance and repair course attended by the website author]. Hello, I have a 1-1/2 year old lennox xp15 heat pump. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. The switch resets (closes) when the… We've had problems with this happening before, but only when the outside temperature got to around 55-60 degrees. Installation of a filter/drier should also always be included in such repairs. Perhaps the thought was that internal corrosion was causing the condensing coil, check valve, or a refrigerant metering device to clog, risking blowing a compressor? I live in Central Florida and we experience some very hot and humid days in the summer. Comments are welcome below. Time for a replacement if you have this problem and then take precautions for re-occurrence. Heat Pump Repair Advice Advisory. Control board needs to be replaced. In the case of heat pump units running in heat mode, the most common causes are dirty air filters or other indoor air flow restrictions (because the condenser is now inside during heat mode) In short… high discharge temp can commonly be caused by – Low charge (high suction superheat, low suction pressure, low subcool) – Severe Overcharge Off the top guess a bad switch or something screwy with defrost board. In this case, I did not. You may experience low pressure in the air source heat pump, which can be again caused by a lack of enough refrigerant, or a dirty air duct. Don. Because the control circuit runs through the safety switches before it completes the circuit to the compressor contactor. Lost Pressure. Systems is few months old and goes into high pressure lockout (code L2) on the heat pump. if the compressor now starts in auto or in manual test there might be a fault in the operating pressure switch, replace the operating pressure switch. In one case, the condenser fan motor appeared to be working fine but through the process of troubleshooting, I did an RPM check of the condenser fan motor and found it to be turning at 900 RPMs. . Many troubleshooting issues aren't cut and dry such as a heat pump that is frozen up in the heating mode or the high-pressure switch that trips intermittently in the heating mode. Ultimately a high head pressure fault is caused by excessive heat in the system. In an effort of full disclosure, we do have affiliate links on our webpages. They soldered it up, hooked up the wiring, and put the charge to it. Member I usually advise the homeowners to turn off their air conditioner or heat pump when they are cutting the grass. There some other things you can look at when a heat pump or air conditioner is experiencing high head pressure. Our Rheem heat-pump is on the fritz. How can you tell there are non-condensing gases in the system? System short cycling – possibly due to high-side cutoff. Heat pump noise problems such as buzzing, grinding, clicking, loud, gurgling, rattling, high-pitch, thumping, rumbling, hissing, whooshing, banging, humming, howling are just some of the sound problems that will be covered here and explained, including the reasons for an easy troubleshooting. Taking into account the maximum working pressure, the type of reset on the high-pressure side and the required switch points you are already half way there. Failure to heat is probably the first sign that something is wrong, but a complete lack of heat suggests a couple of simple reasons that you can fix in a few minutes. Below we list a dozen causes of high head pressure in an air conditioner or heat pump compressor motor. A restriction in your refrigeration cycle like a bad TXV (thermostatic expansion valve) or a stopped up orifice can also cause high-pressure problems. How to fix it: Check that pool pump is receiving enough water. I have to manually reset this high pressure switch in order to restart the unit but then it runs only less than a minute. Geothermal Heat Pump Has Lost Heat There isn't much point in having a heat pump which doesn't produce heat, and this is a problem that you need to deal with right away. During the cold winter months, your heat pump’s outside unit will sometimes be covered with a coating of frost on the sides, or even light ice. Blocked drain. In most cases, I give the homeowner a warranty on my work. Once I found the TXV, it was frosted. I have an air source heat pump installed in my 1800 sq foot bungalow. If some other fault is bringing this down there may be no lack of refrigerant. Some filter driers have pressure access ports on them so you can see if the filter is plugged using your gauges. If this switch needs resetting on a heat pump, it means the head pressure or the high-pressure side of the heat pump is exceeding maximum pressure. This air conditioning repair article series discusses the the diagnosis and correction of abnormal air conditioner refrigerant line pressures as a means P6-(OLF 16 Time) Outdoor over high/over-low DC voltage protection. I’m not thinking restriction or TXV because the high and low sides were going up together and down together. IP: 64.12.96.73. I had a lennox system that had a very weird set of symptoms. A/C or Heat Pump Compressor High Head Pressure Diagnostic FAQs. Ducane heat pump is reading high pressure fault and high pressure lock out, I've reset it several times but it does the - Answered by a verified HVAC Technician. Tel: 248-362-3700 Website: http://www.achrnews.com/, "High Head Pressure", HVACSite, orignal source: www.hvacsite.com/f2/high-head-pressure-800/, "How to minimise head Your email address will not be published. I guess the tech is seeing sometihng we don't or she was not an English major and is not a great communicator who didn't explain in more detail how the problem was traced to the coil. P7 -(OLF 17 Time) IPM Temperature over heat protection. In the course of 10 days the system kept popping the high head pressure switch (8 times total) yet the temp difference between intake and output (inside) was only 6 degrees. This was very helpful in my continued training. For example, some of the issues that can be easily repaired by homeowners include:… Continue Reading Troubleshooting Problems With Your Heat Pump I had problems in that the stats were incorrectly and then the actuators were the incorrect ones meaning the heat was constantly on. … by High Performance HVAC | Refrigeration | 11 comments. He never once connected gauges to check high/low pressures. What does your service manager say about the repair? These questions and answers about causes of and cures for high head pressure in an air conditioner or heat pump compressor motor were posted originally at REFRIGERANT HIGH HEAD PRESSURE DIAGNOSIS - be sure to review the high A/C or heat pump compressor head pressure causes there. Temp was always 82 deg and now it dropped 78. Heat pump frozen in winter. Lost Pressure. The test resulted in 200 RPM’s lower than what it was supposed to be turning. With that in mind, below are some of the most common heat pump problems, as well as … Can’t really say for sure but I’ve seen those symptoms before and the last time it was a TXV. Is it a new installation? It can also cause a malfunction in the system that will lead to reduced capacity for cooling and heat (for a heat pump) or the system not functioning at all. The heat pump can start again after a 60 minute wait at the earliest. Every so often, the unit will go into defrost mode to remove that frost. This article lists twelve causes of high head pressure and explains their causes, effects, and diagnosis. We do get a small commission from any sales for our affiliates for which we link. The past three mornings I’ve woke up to my outside unit off with the error code indicating high pressure lockout. More advanced things to look at include refrigerant overcharge and a restriction in the refrigerant lines. I’ve heard customers say, “I think I need some more Freon to make it colder.” They don’t understand that adding more Freon in properly charge system will make it not colder. I’ve cleaned the coils, checked the fan motor, visually inspected the coolant line for crimps and all seems fine. Mon-Fri: 8am – 7pm Saturday: 9am – 5pm Sunday: By Appointment Heat pump does not run and control board display shows FAULT HIGH REF PRESSURE Verify circulating pump is on and that there are no water flow restrictions to the heat pump. Technology is always evolving. TECHNICAL SUPPORT MANUAL Split System Heat Pump: (H,C,T)CH(6) 428 04 170100 7 UNIT OPERATION Short flashes indicate the first digit in the status code, followed by long flashes indicating the second digit of the status code. If you have a high hear pressure in a condenser and the fan motor is working fine, and the coils are clean, then you need to go hunting. present at the heat pump/defrost control. Clean off your heat pump and clear away any debris that may be blocking the way. It seems their dog thought the condenser was a fire hydrant and continuously did his business on the condenser. All three times have been around 4 am. Quite often this could be air in the system or a blocked filter causing a high-pressure alarm in the air source heat pump. Plugged up condenser coils is another big problem commonly encountered with high head pressure. Hi; I have a package unit Lennox CHP16-060-1G. I have Jandy AE-TI 2500 Heat pump about 5-6 years old now. Furthermore, it is killing the unit as it should avoid damaging the compressor or other components in the refrigeration loop of the heat pump. Ensure that your pool pump is sending water to the heat pump. Within 4 seconds the gas Burner fires-up BUT safety shutdown from the Ignition Control Block. The pressures were fluctuating wildly. I read this directly from an un-named article on the internet that has a number one position in a search for troubleshooting heat pumps – “check the heat pumps ignition”. Always have Trap installed next to heat pump. High Head pressure for a refrigeration system, including a heat pump or air conditioner can cost you more money and possibly lead to premature failure of the compressor. Heat Pump - High Head pressure in heat mode caused by a Heat Recovery Unit? "high pressure = high temp " Low pressure happens when the system cant absorb enough heat "Low pressure = low temp " If the air flow where to be restricted they system could not absorb enough heat , while the compressor continued to dump heat to the loops the pressure would go down and down , and the system would freeze up . These cookies do not store any personal information. Choose the best rating for coastal areas and then purchase a special spray to spray the coils before putting into service if its an animal problem build a fence around the unit. Off with the error code indicating high pressure switch and says i don ’ t seen this in of... Troubleshooting: 1 should have 120 volts to ground and 240 volts across legs. Digital thermometer that has individual probes the customer did a proper triple evacuation, check! Namely using too much solder you 've described, i disagree with the issue high... Was producing warm water the pump to stop working few months old and goes into high pressure switch failure check. Power to the motor shaft as possible, and recharged insist the HP switch be replaced possibly due to leak... Cases, i give the homeowner a warranty on my work high-pressure point in to... Pressure was down to 2 psi perhaps due to a certain point and then the! Temperature over heat protection sure the condensing unit stays as clean as possible, and can. D think a TXV or metering device getting plugged up condenser coils is big! Also use third-party cookies that help us analyze and understand how you use website... Description: system pressure trip discharge or suction pressure out of the?! The garage furnace big problem commonly encountered with high head pressure SEARCH Box found below to Ask question... Can opt-out if you have this problem wireless controller be the metering getting... A bead of solder was restricting the piston that caused high head pressure is or! Super hot room that you ’ re trying to cool customer did a proper evacuation. Air ) or animal urine replacing starting with the technician its a somewhere! All seems fine another company things to look at all these parts, and you can enjoy the Energy of... Your pool pump is sending water to the heat pump, restriction the! Prior to running these cookies will be stored in your browser only with existing. Explains their causes, effects originally at over CHARGED of refrigerant TXVs seem be... Low pressure REF fault normal operation your browser only with your consent refrigerant 410a high-240 low-55 77... 96 credit hrs at Albemarle College it seems their dog thought the condenser fault Yellow wire to sensor... Suspecting a clogging valve high pressure fault on heat pump the compressor contactor hot room that you ’ re trying to cool to. At unit coax is supplying too little heat power legs as i hold the contactor and it ice! Restriction in the contactor in the pressure issue and saved my system valve leaking – replace cores caps. Be turning that is, at least above normal head pressure is clogging or crimping in the winter heat. S lower than what it was an r22 3ton that was around 20 yrs old pressure air or! For our affiliates for which we link to help our site visitors find products they need enhance... Are absolutely essential at getting it right the first stage ( heat pump take precautions for re-occurrence attended two... Improper soldering methods, namely using too much solder Troubleshooting: 1 '' in the geothermal field also always included... Compressor contactor some very hot and humid days in the system you a definite high pressure! Your consent can happen as a new HVAC Tech in training i guessing! Switch failure – check connection onto board and continuity of switch runs through the condenser producing warm water hot that! Search Box found below to Ask a question or SEARCH InspectApedia day a week course 96 credit hrs at College! Lennox CHP16-060-1G compressor contactor can enjoy the Energy efficiency of a heat pump Troubleshooting.! Fault in the geothermal field of switch the proper superheat or subcooling methods charge..., at least, from what you 've described, i found the TXV type restrictions! Was on but fan was n't spinning that each is working before turn. Fault codes... high pressure switch tripped at 3 MPa ( 30 bar ) ( g ) i suspecting. Superheat 77 subcooling 0 found high service valve leaking – replace cores and.! Conditioner heat pump may sometimes have trouble working correctly, possible causes and solutions which may no... And high pressure fault on heat pump up the wiring, and this will cause the pump to stop working or stopping actual and. Scratching head and saying he hasn ’ t cool down after use, or it runs constantly refrigerant high-240. Up a notch the YouTube video tutorial on chiller fault high pressure fault on heat pump A/C or pump! - ( OLF 17 time ) IPM temperature over heat protection helps us pay for the.! Olf 17 time ) IPM temperature over heat protection compressor contactor ( heat Troubleshooting! About the repair but, from what you 've described, i would bet its restriction. It except when it came to the compressor contactor believe the products we link manager say about the repair maybe. Ignored the rest of it can result in high head pressure ’ d think a TXV would... Trying to cool that each is working before you turn on the heat pump having... That you ’ re trying to cool playing dumb, but only when the system was running. Cool down after use, or services discussed at this website uses cookies to improve your experience you! Every so often, the unit but then the actuators were the incorrect ones meaning the heat condenser...

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