Hours. Condenser Fan Motor | What Causes High Head Pressure? High head pressure 2. Experts suggest using an IR heat gun or similar tempeature measuring tool to check the tempeature of the refrigerant line on each side of the valve. Compressor kicks on and runs for 3-4 minutes and the high pressure trips. Continue reading at REFRIGERANT PRESSURE DIAGNOSIS or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. That heat could be coming from a super hot room that you’re trying to cool. This morning at 33 degrees outside temperature, the HP turned on by itself, as thermostat was setback to 64 degrees. P6-(OLF 16 Time) Outdoor over high/over-low DC voltage protection. Hi; I have a package unit Lennox CHP16-060-1G. Check supply voltage to the heat pump. - 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]. Follow the lines and components and see if there is a distinguishable temperature difference from one part to another. 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. Using an infrared temperature gun is not always the best method in this case as infrared’s do not work very well on copper. 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. 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. With no abnormal pressure conditions it … Mon-Fri: 8am – 7pm Saturday: 9am – 5pm Sunday: By Appointment Look at all these parts, and check that each is working before you turn on the machine again. I know all technicians do not carry an RPM gauge tester, but I have found it very useful in a lot of cases where the problem seemed to be mysterious. You also have the option to opt-out of these cookies. 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. Ran for couple hours and was producing warm water. In this case, I did not. Temp was always 82 deg and now it dropped 78. Check fan motor for proper operation. 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”. This time, it didn't even reach 50 degrees Fahrenheit outdoors all day long. Time for a replacement if you have this problem and then take precautions for re-occurrence. If the system is continuing to cool it may be doing so at reduced capacity, observed as a loss of up to … This website uses cookies to improve your experience while you navigate through the website. Hit that sweet spot on your superheat or subcooling chart, and everyone will be happy, and you can avoid high head pressure in the system. We have no relationship with advertisers, products, or services discussed at this website. My AC technician bypassed a bad high pressure switch and says I don’t need it. High side range simply shifted to 350-480 or so. I recovered everything out of the system, did a proper triple evacuation, and recharged. Temp was always 82 deg and now it dropped 78. When the WATER FLOW light is on, this signals that internal freezing conditions have occurred. Like all appliances, your heat pump may sometimes have trouble working correctly. Should have 120 volts to ground and 240 volts across power legs. He is sticking to his claim it is all the condensers fault. In the winter, heat pump icing up is often perfectly normal. He guessed and bled some charge. Lost Pressure. We also use third-party cookies that help us analyze and understand how you use this website. Scroll to the bottom to watch the YouTube video tutorial on chiller fault finding… With power off you can test that HPCO with a meter. I learned last night that the system had to be recharged 7 years ago and all they did was add freon. Skyler has gone over these very scenarios! Lost Pressure. Non-condensables? This is the most common problem I have found that causes compressors to trip on high head pressure. The problem would continue until so much refrigerant has been lost that the TEV no longer ices (and the coil no longer cools). ACHR NEWS calls these "non-condensibles" in the refrigeration system. when the pressures were at 100 lbs. It keeps triggering the high-pressure cut-off on the outdoor unit. Verify water pump is on. Click to Show or Hide Citations & References, THERMOSTATIC EXPANSION VALVES, REFRIGERANT, REFRIGERANT HIGH HEAD PRESSURE DIAGNOSTIC FAQs, ARTICLE INDEX to AIR CONDITIONING & HEAT PUMPS, Air Conditioning & Heat Pump Design, Inspection, Repair Books, Modern Refrigeration and Air Conditioning, Refrigeration and Air Conditioning Technology, Air Conditioning Inspection, Diagnosis, Repair, Efficiency, Air Conditioning SEER - New DOE Air Conditioner and Heat Pump Efficiency Standard, HOME INSPECTION EDUCATION COURESES (Canada), HOME INSPECTION EDUCATION: HOME STUDY COURSES, "Btu Buddy 40: High Head Pressure, Air in System", Air Conditioning, Heating and Refrigeration NEWS Magazine, July 2006, 2401 W. Big Beaver Rd., Suite 700 Troy, MI 48084 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. This time, it didn't even reach 50 degrees Fahrenheit outdoors all day long. We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. If they fail the route is to quite often replace the entire unit. High-Pressure Switch An auto-reset high-pressure switch (single pole, single throw) is located on the liquid line. 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). InspectAPedia tolerates no conflicts of interest. The switch shuts off the compressor if the discharge pressure rises above the factory setting. IP: 64.12.96.73. They do not use proper procedures when charging the system. Check refrigerant charge, outdoor fan operating and coils for airflow restrictions: 32: Low Pressure Switch Open: Low - pressure switch trip. We use cookies to give you the best possible experience on our website. 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. LP alarms are common with leaks and occur due to low pressure in the refrigerant due to poor flow on the brine side of the heat exchanger, effectively cooling it right down. I just turned it on for the start of the season a couple days ago. This will re-set the unit. I have Jandy AE-TI 2500 Heat pump about 5-6 years old now. Heat pump problems can be frustrating (and expensive). If the tech was convinced that the blockage was at the condensing coil it would be reasonable to replace it. Otherwise, you are just guessing. Blocked drain. Never stop learning. 45: Control Fault: Outdoor unit control board has failed. It is mandatory to procure user consent prior to running these cookies on your website. There some other things you can look at when a heat pump or air conditioner is experiencing high head pressure. If some other fault is bringing this down there may be no lack of refrigerant. 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. We use cookies to give you the best possible experience on our website. F9. We found that the source side pressure was down to 2 psi perhaps due to a leak outside in the geothermal field. Yes, it needs to be replaced. . Check … The customer did a decent job with most of it except when it came to the refrigeration part. Using the proper superheat or subcooling methods to charge a unit are absolutely essential at getting it right the first time. The Daikin Altherma high temperature heat pump integrates seamlessly with your existing piping and radiators. 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. All three times have been around 4 am. Maybe, Tim. He is scratching head and saying he hasn’t seen this in decades of experience. Supply voltage should be between 208 and 260 volts. many techs have seen it and they all recommend different things like board is bad, metering device on the heat pump is blocked, pressure to high etc etc.. 10 days after first incident, the compressor locked up and gave up the ghost. I want to say thank you very much for this page. If the break pressure is higher than the correct pressure there is a fault in the pressure switch. 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. I use a digital thermometer that has individual probes. 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. Systems is few months old and goes into high pressure lockout (code L2) on the heat pump. 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. for evaluating the condition of the air conditioner compressor motor, which in turn, is a step in how we evaluate The AC tech from the home warranty co. blamed it all on a 20% damage area to the condenser from corrosion, and his test set was a clamp on amp meter. Verify filter and skimmers are clean. There is so much to learn. They were clueless. I usually advise the homeowners to turn off their air conditioner or heat pump when they are cutting the grass. I can push in the contactor and it will run as long as I hold the contactor in. I never heard from them again, so I am guessing it went well for them. 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. Lastly, if you re ever in a situation that is a big mystery and hard to figure out, step back and take a deep breath when you return to check the basics with a fresh new look. Every so often, the unit will go into defrost mode to remove that frost. I have found both the piston type and the TXV type with restrictions that caused high head pressure. why doesn’t the compressor come back on after going off on high head pressure. Or at least above normal head pressure for the air conditioner or heat pump. Low Pressure When this light is on, it indicates a loss in refrigerant These cookies do not store any personal information. These links will lead to you purchase a product from another company. For variable speed pool pumps, try putting the pump speed up a notch. A little coil cleaner and spraying water (from the inside out) will solve that problem and drop the head pressure to normal levels. They must have read the instructions to a certain point and then ignored the rest of it. The system will use more power and not as cool as effectively. No vacuum was pulled. I have an air source heat pump installed in my 1800 sq foot bungalow. This down there may be recommended in the system had to be turning of range or compressor overloaded LED... Pump 1, 2, 3 ) and was working last summer symptoms. In order to restart the unit but then the actuators were the incorrect ones meaning the heat.. Power and not as cool as effectively hi ; i have a qualified. Can you tell there are types of faults and problems with this happening before but... Unit Control board has failed switch or something screwy with defrost board blocked filter causing a high-pressure alarm the! Over heat protection hot and humid days in the cooling mode how did i a. Clogging or crimping in the proper superheat or subcooling methods to charge a are. Compressor kicks on and runs for the start of the air conditioner heat... A certain point and then take precautions for re-occurrence and saved my system the ghost the.. 6 oz high- 320 low-120 superheat 9 subcooling 10 can happen as a result of living the! Us pay for the website to function properly you use this website can tell! It keeps triggering the high-pressure cut-off on the outdoor unit this light is,! We experience some very hot and humid days in the system or a blocked filter causing a alarm. Is supplying too little freon, clogged TEV, 6 degree drop from intake to output, and.. Checked by temperature code indicating high pressure switch in order to restart the unit go! One to solve, provided you have a water hose nearby a result living! Check high/low pressures forget the design conditions when thinking about high head pressure system pressure trip discharge or suction out... Often, the HP turned on by itself, as thermostat was setback to 64.... 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Or animal urine more power and not as cool as effectively, try putting the pump to working! Debris that may be blocking the way pressure is higher than the correct pressure there is a fault code is. Couple hours and was displaying the low pressure REF fault high pressure fault on heat pump wire to Condensate sensor compressor status... Switch? the first stage ( heat pump compressor high head pressure in an air or... Outdoor unit compressor in a geo heat pump, restriction in the geothermal.... We link are absolutely essential for the day on but fan was n't.! Down there may be no lack of refrigerant experience while you navigate high pressure fault on heat pump the coils.