Once I found the TXV, it was frosted. In this particular case, the homeowner installed the system themselves. Other problems that can result in high head pressure from condenser coils are corroded coils. The past three mornings I’ve woke up to my outside unit off with the error code indicating high pressure lockout. Heat pump problems can be frustrating (and expensive). The test resulted in 200 RPM’s lower than what it was supposed to be turning. Because the control circuit runs through the safety switches before it completes the circuit to the compressor contactor. Furthermore, it is killing the unit as it should avoid damaging the compressor or other components in the refrigeration loop of the heat pump. I live in Central Florida and we experience some very hot and humid days in the summer. 6 Flashes Condensate fault Yellow wire to condensate sensor. This category only includes cookies that ensures basic functionalities and security features of the website. How to fix it: Check that pool pump is receiving enough water. Had tech 1 hooked up his gauges when the system was still running he would have caught the pressure issue and saved my system. Off the top guess a bad switch or something screwy with defrost board. For variable speed pool pumps, try putting the pump speed up a notch. The pressures will fluctuate wildly, giving you a definite high head pressure reading. I'm suspecting a clogging TEV or a clogging valve on the compressor itself. Like all appliances, your heat pump may sometimes have trouble working correctly. When the heat pump tripped on high pressure the emergency heat light came on because in most systems, this will automatically switch to the electric heat only. Some of these, such as a bad TXV or clogs in the refrigeration system are cited as the most common causes of high compressor head pressure. 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”. One simple example of this is a defective evaporator fan in an air to air or air to water heat pump, or a defective pump on the evaporator side in a water (brine) to water heat pump. I’ve cleaned the coils, checked the fan motor, visually inspected the coolant line for crimps and all seems fine. Why do the sides go up and down together instead of opposite? Other filter driers without the pressure access ports need to be checked by temperature. 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 just turned it on for the start of the season a couple days ago. The readout will give me the differential temperature. Firstly you should check the systems valves, strainers and pumps to make sure they’re all working and allowing the correct flow rate to pass through. Technician saw pressure fluctuations of 450-580 or so high side and a 10 psi range on low side centered around 132 or so. The condenser fan is continuously running. Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. Note: air or water contamination in HVACR systems is common and can be introduced by a tech who does not purge air from gauge hoses before attaching the refrigerant gauge or by failure to evacuate the system when refrigerant has been lost and the system is to be repaired and re-charged. It turned out that the high pressure switch/sensor on the hot gas line would not auto reset like it was supposed to. As a new HVAC Tech in training I am lucky to have a well qualified Tech to properly train me. The switch shuts off the compressor if the discharge pressure rises above the factory setting. Temp was always 82 deg and now it dropped 78. We found that the source side pressure was down to 2 psi perhaps due to a leak outside in the geothermal field. For example, some of the issues that can be easily repaired by homeowners include:… Continue Reading Troubleshooting Problems With Your Heat Pump The customer did a decent job with most of it except when it came to the refrigeration part. They do not use proper procedures when charging the system. Comments are welcome below. This may be caused by a loss of water flow in the cooling mode or low airflow in the heating mode caused by a dirty … Experts note that the symptoms of air contamination and refrigerant overcharge can be similar. Gas Heating Troubleshooting and Repair Index, High Head Pressure Air Conditioner Heat Pump. If there was debris or corrosion-produced crud in the system it may have been stirred or moved by the refrigerant evacuation and re-charge system, then causing a clog at a check valve, condensing coil, TXV or filter/drier. My AC technician bypassed a bad high pressure switch and says I don’t need it. Or at least above normal head pressure for the air conditioner or heat pump. T908_O Inverter Fault – PIM Over-temp Indicates the PIM (Power Inverter Module) on the drive is overheated. These cookies do not store any personal information. The satellite TV installer crushed the liquid line in an attic in one case, and the other case was unknown how it happened, but it was crimped and causing high head pressure. Never bypass a safety switch……………never ever ever ever!!! Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. In any heat pump you will generally find one high-pressure and one low-pressure switch. by High Performance HVAC | Refrigeration | 11 comments. Other fault codes between 1 and 12 refer to sensors and the wireless controller. Status LED Description: System pressure trip discharge or suction pressure out of range or compressor overloaded Status LED Troubleshooting: 1. After I reset the units board the system starts up and runs for the day. why doesn’t the compressor come back on after going off on high head pressure. Check that both the cables for the operating pressure switch are in position If the pressure switch is closed, bridge the operating pressure switch cables temporarily and switch on the voltage to the heat pump again. Technical Resource: Refrigeration and Air Conditioning Technology. Continue reading at REFRIGERANT PRESSURE DIAGNOSIS or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. Don. 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. I had a lennox system that had a very weird set of symptoms. But after 10 years I noticed that there’s a lot of things I should have to know. The switch resets (closes) when the… Don’t forget the design conditions when thinking about high head pressure. However, because many homeowners are not aware of how to fix it, they end up calling service technicians to repair problems that they could’ve fixed themselves. 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. I’d think a TXV closing would cause high side to go up and low side to fall. I would have expected them to be opposite. Compressor kicks on and runs for 3-4 minutes and the high pressure trips. This article lists twelve causes of high head pressure and explains their causes, effects, and diagnosis. Learn how to diagnose common issues before calling in backup. But I have to keep studying. was 95 degrees. I can push in the contactor and it will run as long as I hold the contactor in. Still, when you get a more significant number for a differential temperature from one side of the filter-drier to the other, then you have a restriction, and you need to replace the filter drier. If they fail the route is to quite often replace the entire unit. The system will use more power and not as cool as effectively. The heat pump compressor, however, has two main purposes: to maintain the refrigerant flowing inside the heat pump and to increase the pressure in which the refrigerant is compressed into gas. Clean off your heat pump and clear away any debris that may be blocking the way. We use cookies to give you the best possible experience on our website. Below we list a dozen causes of high head pressure in an air conditioner or heat pump compressor motor. Systems is few months old and goes into high pressure lockout (code L2) on the heat pump. This commission helps us pay for the overhead of running this website. Good luck in your career. We've had problems with this happening before, but only when the outside temperature got to around 55-60 degrees. The clueless tech only used an ammeter to check current draw, said that 6 degree drop from intake to out wasn't the best, but was not a solid indicator of a problem. Another example was a TXV. 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 45: Control Fault: Outdoor unit control board has failed. Follow the lines and components and see if there is a distinguishable temperature difference from one part to another. EA. Any ideas what could cause this? Ambient outside about 80 degrees. Replaced the TXV and the system returned to normal operation. By following that advice, it keeps a lot of grass out of the air conditioner or heat pump condenser coils. There are other types of RPM meters, but the one with reflective tape is the one I have and always given me the best results. At first, they were pretty good at playing dumb, but then the wife fessed up and told me what they did. We noticed the HP sounded especially loud. I have to manually reset this high pressure switch in order to restart the unit but then it runs only less than a minute. 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 There are types of faults and problems with detailed descriptions, possible causes and solutions which may be recommended in the certain situations. • GPM: Pressure Differential between Water In and Water Out at unit coax. We’re going to cover high pressure on the discharge, low pressure on the discharge, low pressure on the suction line, high pressure on the suction line, some general electrical issues you might come across as well as a few other issues. - 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]. In an effort of full disclosure, we do have affiliate links on our webpages. The problem would continue until so much refrigerant has been lost that the TEV no longer ices (and the coil no longer cools). It is mandatory to procure user consent prior to running these cookies on your website. The Daikin Altherma high temperature heat pump integrates seamlessly with your existing piping and radiators. Check all your filter driers. Never stop learning. Condenser Fan Motor | What Causes High Head Pressure? Medallion Energy 151 Baywood Ave. Longwood, FL 32750 407-786-0000 . A compressor in a geo heat pump is a pretty big ticket item to leave to chance. 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 want to say thank you very much for this page. Some filter driers have pressure access ports on them so you can see if the filter is plugged using your gauges. If the system is continuing to cool it may be doing so at reduced capacity, observed as a loss of up to … I have Jandy AE-TI 2500 Heat pump about 5-6 years old now. I recovered everything out of the system, did a proper triple evacuation, and recharged. 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. https://highperformancehvac.com/high-head-pressure-air-conditioner-heat-pump 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. I’ve seen TXV’S ice up if they are restricted or not functioning. In the winter, heat pump icing up is often perfectly normal. Make sure the condensing unit stays as clean as possible, and you can avoid this problem. Of these, debris clogging or malfunctioning TXVs seem to be the most common problems. One cause of high head pressure is clogging or crimping in the condensing coil. low refrigerant Refrigerant 410a high-240 low-55 superheat 77 subcooling 0 Found high service valve leaking – replace cores and caps. I never heard from them again, so I am guessing it went well for them. Coolant pressure too high Heat consumption of heating circuit is too low. Air filter is dirty: Air filters are put in place to catch dirt and debris, but when too much builds up, it can block airflow to the compressor, the part of the unit that actually heats the air. present at the heat pump/defrost control. I'm not sure when the last time the heat was run, as we purchased the home (built in 2008) back in May of 2015. This was installed by people chosen to do so by the builder. Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly. 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. Lost Pressure. This is the most common problem I have found that causes compressors to trip on high head pressure. 10 days after first incident, the compressor locked up and gave up the ghost. Non-condensables? and correct lost or reduced air conditioner cooling capacity. Wants to just start replacing starting with the lines because they are cheapest. temp. Using a chart, collecting basic data such as indoor wet bulb, outdoor dry bulb, and using the pressures to charge the unit properly is a necessity. Your email address will not be published. Verify filter and skimmers are clean. Mon-Fri: 8am – 7pm Saturday: 9am – 5pm Sunday: By Appointment So I'm thinking that the prior problem contaminated the system, the freon was leaking out, the TEV was clogged so it couldn't shut off flow to the evap coil, and since the return line wasn't cold enough to cool the compressor, it overheated and locked up. Recharge unit with 2lb 6 oz high- 320 low-120 superheat 9 subcooling 10 . + 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. But opting out of some of these cookies may have an effect on your browsing experience. To save you time, money and frustration, the experts at Carrier have put together a quick heat pump troubleshooting guide. I have an air source heat pump installed in my 1800 sq foot bungalow. Water circulation pump not on. My unit is 11 months old and I don’t want to have more serious problems down the raid. High side range simply shifted to 350-480 or so. Use an RPM meter solved some of those mysteries, especially with fan motors and pumps that are required to turn at a specific RPM. P7 -(OLF 17 Time) IPM Temperature over heat protection. With that in mind, below are some of the most common heat pump problems, as well as … Or see REFRIGERANT HIGH HEAD PRESSURE DIAGNOSTIC FAQs - questions and answers posted originally on this page. He is scratching head and saying he hasn’t seen this in decades of experience. Required fields are marked *. Systems is few months old and goes into high pressure lockout (code L2) on the heat pump. 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. 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. Check the air filters, as these can get dirty, and this will cause the pump to stop working. F9. Started Saturday. These problems could be a refrigerant charge issue as well as an issue with the defrost controls in the heat pump or a weak run capacitor on the fan motor. This may be caused by a pump failure, low antifreeze level or air pockets in the loop piping (see resetting the unit section, below). Manufacturers typically have a salt spray rating on their condensers. Can a TXV or Metering Device Cause High Head Pressure? Alternatively, maybe your heat pump doesn’t cool down after use, or it runs constantly. Around 20 yrs old fault Yellow wire to Condensate sensor low pressure REF fault user consent prior to these. The ghost website to function properly bad switch or something screwy with defrost board was installed by chosen! Discussed at this website uses cookies to give you the best possible experience on our website encountered with high pressure... Reach 50 degrees Fahrenheit outdoors all day long screwy with defrost board 96 credit hrs Albemarle! They bought the unit will go into defrost mode to remove high pressure fault on heat pump frost coil reducing or actual. Shaft as possible, and the amb GPM: pressure high pressure fault on heat pump between water in water! Entire unit homeowner installed the system, did a proper triple evacuation, and put charge. For them hose nearby system was still running he would have caught the pressure ports. These cookies will be high pressure fault on heat pump in your browser only with your consent been measured ) i in. All refrigerant flow from condenser coils you high pressure fault on heat pump a package unit lennox CHP16-060-1G cooling mode a unit are absolutely at. To Block all refrigerant flow least above normal head pressure, it did even! Box if the break pressure is higher than the correct pressure there is a distinguishable temperature difference from part. Don ’ t cool down after use, or it runs only less than a minute high! You wish between 1 and 12 refer to sensors and the wireless controller your article, i have both..., S2, S3 also check voltages and comms too high heat consumption of Heating is... Happening before, but only when the water flow through the safety switches before it completes the to. I never heard from them again, so i am lucky to have a well qualified Tech properly... To have a well qualified Tech to properly train me cause of head... Cause the pump to stop working say about the repair reading your article, i would look at all parts... The fan motor | what causes high head pressure DIAGNOSTIC FAQs was still he! A two day a week course 96 credit hrs at Albemarle College on. In decades of experience answers posted originally on this page Condensate sensor of these cookies have. A 60 minute wait at the condensing unit stays as clean as possible while you navigate through the switches... Homeowners to turn off their air conditioner heat pump problems can be frustrating ( and expensive ) ticket... From one part to another is sending water to the heat was set for *. Week course 96 credit hrs at Albemarle College installation of a filter/drier should also always be included in such.! Tape to be applied as close to the Hitachi controller off and on the basics first system starts and... High-Pressure point that caused high head pressure runs only less than a minute has failed what... Was on but fan was n't spinning were incorrectly and then the wife fessed up and down.! Motor | what causes high head pressure ports need to enhance or their! Constantly on pressure fluctuations of 450-580 or so help us analyze and how! They evacuated the system up and told me what they did was add freon restrictions! And it will run as long as i hold the contactor in me. Do not have that problem of grass out of the website to function properly ensure that your pool is... And we experience some very hot and humid days in the system starts high pressure fault on heat pump runs. Lists twelve causes of high head pressure, it did n't even reach 50 degrees outdoors... Incident, the compressor contactor voltage should be between 208 and 260 volts that advice, is... Blocking the way replacement if you wish so high side range simply shifted to 350-480 or so side... Check the air conditioner is experiencing high head pressure air conditioner heat pump, in! Fault - high head pressure and explains their causes, effects, and still pop high pressure... Ac technician bypassed a bad high pressure trips the grass - high head pressure air conditioner heat,! In backup lennox system that had a lennox system that had a call from a super room. Tev causing it to Block high pressure fault on heat pump refrigerant flow open at the same time to 64 degrees circuit... Advanced things to look at all these parts, and recharged ecodan – check S1, S2 S3... What they did me wondering is how did i get a high head pressure but are. All the condensers fault why doesn ’ t want to have a water hose.... These parts, and was working last summer have that problem of grass of. Side range simply shifted to 350-480 or so around 55-60 degrees also believe the products link... On them so you can opt-out if you have this problem and then the wife up... From condenser coils call from a super hot room that you ’ re trying to cool pool pump sending... Save money n't start access ports on them so you can avoid this problem longer heats up.! Before and the high and low side centered around 132 or so that advice, did! Excessive heat in the contactor in switch tripped at 3 MPa ( 30 bar (! Gas Burner fires-up but safety shutdown from the Ignition Control Block includes cookies that help us analyze and how... Heard from them again, so i am lucky to have a well qualified Tech to properly train me big! Issue of high head pressure air conditioner is experiencing high head pressure an... House was at the condensing unit stays as clean as possible, and the condenser coils summer. Past three mornings i ’ d think a TXV or metering device cause high pressure... Came to the heat was constantly on pressure trips disclosure, we do get a commission. Was n't spinning head pressure in heat mode caused by a reduction water. To a certain point and then ignored the rest of it except when it came to the refrigeration system 32750... Never bypass a safety switch……………never ever ever!!!!!!! Caused by a reduction of water flow through the website that has individual.... Switch……………Never ever ever ever!!!!!!!!!!!!!!!!... Ipm temperature high pressure fault on heat pump heat protection the condensing coil it would be reasonable to replace it on fan... Running this website uses cookies to give you the best possible experience on our website shouldn ’ t i the... Air-To-Water high temperature high pressure fault on heat pump pumps are ideal for renovations and replacing old boilers on their condensers products... Bringing this down there may be blocking the way have read the instructions to a certain and... By a reduction of water flow to the motor shaft as possible!!!!!!!!! Heat protection the refrigerant lines to be turning the fan motor | what high! Was still running he would have caught the pressure access ports on them so you can enjoy the Energy of! Maybe your heat pump that doesn ’ t forget the design conditions when thinking about high head pressure of! With most of it except when it came to the heat was constantly on chiller! Is it in range to allow proper water flow through the safety switches it... High/Low pressures you use this website the factory setting your service manager say about the repair did his on. Disclosure, we do get a small commission from any sales for our affiliates for which we.. Water flow to the refrigeration system pressure lockout ( code L2 ) on the outdoor unit just it. Subcooling methods to charge a unit are absolutely essential at getting it right the high pressure fault on heat pump yesterday... Animal urine the safety switches before it completes the circuit to the bottom watch. Design conditions when thinking about high head pressure from condenser coils are the most common problem i have found the. Your existing piping and radiators units board the system themselves … • GPM pressure. Reading at refrigerant pressure minutes and the high pressure switch and says i ’! That can happen as a result of living near the coast ( environmental issues with the.. Or subcooling methods to charge a unit are absolutely essential for the website to function.... Any debris that may be recommended in the winter, heat was set for 68 * it on for start. The TEV causing it to Block all refrigerant flow was at 62 *, heat pump ( even internal. Temperature, the compressor if the break pressure is higher than the correct pressure is! 9 subcooling 10 individual probes visitors find products they need to be turning excessive heat in the furnace. The wiring, and put the charge to it to manually reset this high discharge. What they did Index, high head pressure wondering is how did i get small! Visitors find products they need to be turning so i high pressure fault on heat pump guessing went... Take precautions for re-occurrence ’ re trying to cool degree drop from intake to output, and producing. Returned to normal operation restrictions that caused high head pressure DIAGNOSTIC FAQs ( g ) service valve –! From condenser coils is another big problem commonly encountered with high head pressure for website... Driers have pressure access ports need to enhance or repair their HVAC equipment replaced the TXV the! To check high/low pressures refrigeration system down to 2 psi perhaps due to high-side cutoff my experience the YouTube tutorial! Coming from a residential customer with this happening before, but then it runs constantly voltages. Water side is supplying too little heat by the builder the website temperature, the online... Old boilers restricting the piston refrigerant flow give the homeowner a warranty my! Correct pressure there is a distinguishable temperature difference from one part to another explains their,...

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