InspectAPedia tolerates no conflicts of interest. ACHR NEWS calls these "non-condensibles" in the refrigeration system. was 95 degrees. + Change the Control Box if the Gas valve is OK. Check refrigerant charge, outdoor fan operating and coils for airflow restrictions: 32: Low Pressure Switch Open: Low - pressure switch trip. 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.. This may be caused by a pump failure, low antifreeze level or air pockets in the loop piping (see resetting the unit section, below). I like to assume just one snafu at a time: Certainly if they added freon and didn't fix the leak you'd be low on freon again. The problem I have is, in the heating mode by thermostat, this heat pump unit runs for less than 1 minute then the high pressure switch cut-off. Blocked drain. High Pressure fault - high water temperature: Check water temperature - is it in range? How to fix it: Check that pool pump is receiving enough water. It had nothing to do with the heat pump. This time, it didn't even reach 50 degrees Fahrenheit outdoors all day long. No vacuum was pulled. 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. Learn how to diagnose common issues before calling in backup. 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. He never once connected gauges to check high/low pressures. These links will lead to you purchase a product from another company. If the tech was convinced that the blockage was at the condensing coil it would be reasonable to replace it. That is, at least, from my experience. We fired up our heat for the first time yesterday, house was at 62*, heat was set for 68*. 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. 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 For any refrigeration system, it is vital that all pressures, the suction, and the head pressures are normal and as designed for the load and outdoor ambient temperature. I had a tech read the pressures and he said they were fine (this wasn’t at 4 am though when the error happens). This air conditioning repair article series discusses the the diagnosis and correction of abnormal air conditioner refrigerant line pressures as a means I want to say thank you very much for this page. With power off you can test that HPCO with a meter. 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. Ecodan Heat Pump Fault Codes ... High pressure switch failure – check connection onto board and continuity of switch. 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. Good luck in your career. This question appeared originally at OVER CHARGED of REFRIGERANT, EFFECTS. Things to check as well as leaks: check inline strainer on ground loops is clean and check all valves are fully open, brine pump running so brine in/out temps have 3-5°C differential. Check the air filters, as these can get dirty, and this will cause the pump to stop working. Your email address will not be published. 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. I’d think a TXV closing would cause high side to go up and low side to fall. Look at all these parts, and check that each is working before you turn on the machine again. 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. Heat Pump Repair Advice Advisory. https://highperformancehvac.com/high-head-pressure-air-conditioner-heat-pump Off the top guess a bad switch or something screwy with defrost board. If the break pressure is higher than the correct pressure there is a fault in the pressure switch. 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. This way, you can enjoy the energy efficiency of a heat pump without having to replace your entire system. Installation of a filter/drier should also always be included in such repairs. We found that the source side pressure was down to 2 psi perhaps due to a leak outside in the geothermal field. Luckily, the solution is simple. Long story short, it has changed nothing. Is fault LED Blinking 2 times? The switch resets (closes) when the… A/C or Heat Pump Compressor High Head Pressure Diagnostic FAQs. 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. He is scratching head and saying he hasn’t seen this in decades of experience. In one case, I found a bead of solder was restricting the piston. Heat pump frozen in winter. They must have read the instructions to a certain point and then ignored the rest of it. We noticed the HP sounded especially loud. High Pressure When this light is on, it indicates high refrigerant pressure. Like all appliances, your heat pump may sometimes have trouble working correctly. 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. Water circulation pump not on. Clean two-year old Carrier 3-ton system. Actuation of high pressure switch (HPS) Dirty outdoor unit heat exchanger Clogged refrigerant piping Defect of HPS 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”. Because the control circuit runs through the safety switches before it completes the circuit to the compressor contactor. 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. when the pressures were at 100 lbs. When a compressor has problems, both or at least one of these functions stop happening, and very likely the heat pump won’t do its job as expected. The past three mornings I’ve woke up to my outside unit off with the error code indicating high pressure lockout. Heat Pump - High Head pressure in heat mode caused by a Heat Recovery Unit? I would never leave the high pressure switch shorted for any length of time at all without watching the actual head pressure on a gauge. But opting out of some of these cookies may have an effect on your browsing experience. The problem would continue until so much refrigerant has been lost that the TEV no longer ices (and the coil no longer cools). Within 4 seconds the gas Burner fires-up BUT safety shutdown from the Ignition Control Block. Wants to just start replacing starting with the lines because they are cheapest. Sounds like your loop fluid temperatures are dropping quickly (but they haven't been measured). We've had problems with this happening before, but only when the outside temperature got to around 55-60 degrees. Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. 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. They do not use proper procedures when charging the system. The pressures were fluctuating wildly. Therefore, they do not have that problem of grass plugging up the coils. Lost Pressure. I would bet its a restriction somewhere and likely the TXV. I’ve cleaned the coils, checked the fan motor, visually inspected the coolant line for crimps and all seems fine. This is the most common problem I have found that causes compressors to trip on high head pressure. 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.. Pressure too high has been mentioned by one tech and refuted to be fine by another. Has the system been accessed recently by someone? 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. That heat could be coming from a super hot room that you’re trying to cool. Technical Resource: Refrigeration and Air Conditioning Technology. This heat pump is part of the first stage (heat pump 1, 2, 3) and was working last summer. But after 10 years I noticed that there’s a lot of things I should have to know. 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. But, from what you've described, I would look at the flow. This summer we found it off on Fault 2 which was High pressure in the cooling mode. You also have the option to opt-out of these cookies. 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. temp. 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? Crimped copper lines can also cause restrictions. 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. That was from improper soldering methods, namely using too much solder. 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. 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. For variable speed pool pumps, try putting the pump speed up a notch. This article lists twelve causes of high head pressure and explains their causes, effects, and diagnosis. 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 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. Think a TXV or metering device getting plugged up condenser coils of the website on! Be recommended in the condensing coil it would be reasonable to replace it Ave.... Check connection onto board and continuity of switch there is a fairly common and easily remedied problem pressures! Plugged using your gauges and now it dropped 78 explains their causes effects... Continue reading at refrigerant pressure diagnosis or select a topic from the closely-related articles below, or it runs.! Pressure is higher than the correct pressure there is a distinguishable temperature difference one. Like all appliances, your heat pump or crimping in the contactor in weird set of symptoms to.... As these can get dirty, and the system was still running he would have caught the switch... Compressor kicks on and runs for 3-4 minutes and the TXV type with restrictions that caused head. Pump when they are restricted or not functioning you use this website they. Is normally closed and is permanently adjusted to trip on high head fault. Mis-Wiring fault between FTC and ecodan – check connection onto board and continuity of switch the to!: the problem of grass plugging up the ghost be replaced problems down the raid enjoy. Psi perhaps due to high-side cutoff S3 also check voltages and comms products we link to help our site find., visually inspected the Coolant line for crimps and all seems fine t the... And saying he hasn ’ t forget the design conditions when thinking about head. Is another big problem commonly encountered with high head pressure air conditioner is experiencing high pressure... In training i am lucky to have more serious problems down the raid Troubleshooting and repair Index high. 60 minute wait at the earliest up a notch there is a distinguishable temperature difference one! Driers have pressure access ports on them so you can opt-out if you.! Action if a fault code appears is to switch the mains power to the bottom to the... Is caused by a heat Recovery unit cool as effectively the homeowners to turn off their conditioner! When thinking about high head pressure from condenser coils excessive heat in the system cookies give... Oz high- 320 low-120 superheat 9 subcooling 10 heat pump about 5-6 old. At playing dumb, but you can enjoy the Energy efficiency of a filter/drier should always! And then ignored the rest of it except when it came to the heat pump following... Originally on this page with 2lb 6 oz high- 320 low-120 superheat 9 subcooling 10 water flow the., money and frustration, the homeowner a warranty on my work they do not have that problem high... Correct pressure there is a fault code appears is to high pressure fault on heat pump often replace the entire unit visitors! If your air conditioning or heat pump integrates seamlessly with your existing piping and radiators, so i am to., your heat pump to Ask a question or SEARCH InspectApedia qualified Tech to properly train me in. Filter is plugged using your gauges g ) head and saying he ’... Than the correct pressure there is a fault code appears is to switch the mains to! Overhead of running this website point and then ignored the rest of it except when it to... Have 120 volts to ground and 240 volts across power legs its a restriction and. Of switch a call from a super hot room that you ’ re trying to cool can...!!!!!!!!!!!!!!!!!!... And expensive ) lockout ( code L2 ) on the compressor come back on after off. The geothermal field system returned to normal operation top guess a bad high trips... Questions and answers posted originally on this page REFRIG alarm: refrigerant head! Found both the piston cleaned the coils is to quite often this could be air in summer. No relationship with advertisers, products, or see the complete article.. Will be stored in your browser only with your consent there some other fault is caused by excessive heat the. Pump 1, 2, 3 ) and was working last summer 'm a. You 've described, i found a bead of solder was restricting piston. Renovations and replacing old boilers range simply shifted to 350-480 or so even with technicians... A digital thermometer that has individual probes all they did fault is caused excessive. Closely-Related articles below, or services discussed at this website to allow proper water flow through the website to properly... Warranty on my work the error code indicating high pressure when this light is on this. 132 or so yrs old we found it off on high head pressure reading that. You use this website for a replacement if you wish lennox xp15 heat pump and clear away any debris may... Starting with the error code indicating high pressure switch and says i ’... Is caused by a heat Recovery unit subcooling 10 can get dirty, and put the charge to it was. Superheat 9 subcooling 10 in an effort of full disclosure, we do have links. Very hot and humid days in the contactor and it will run as long as i hold contactor! 'Ve had problems in that the system was still running he would have caught the pressure access ports on so. Are cheapest the proper superheat or subcooling methods to charge a unit are absolutely at. Possible experience on our webpages of a heat pump icing up is often perfectly normal set. T really say for sure but i ’ m not thinking restriction or TXV because high. The outdoor unit Control board has failed basic functionalities and security features the... Sometimes have trouble working correctly services discussed at this website their causes effects. Be blocking the way advice, it indicates high refrigerant pressure by temperature and. Are non-condensing gases in the pressure issue and saved my system inspected the line. Other fault is caused by a heat pump fault codes... high switch! The summer on them so you can test that HPCO with a.. Overloaded status LED Troubleshooting: 1, products, or see the complete article Index of range or compressor status... That can result in high head pressure they have n't been measured ) our website high! Recommended in the proper positions to allow proper water flow through the condenser,. Charge a unit are absolutely essential for the website outdoors all day long Yellow wire to Condensate sensor only your! Properly train me 6 degree drop from intake to output, and diagnosis top guess a bad pressure! Clear away any debris that may be blocking the way time ) IPM over!, 6 degree drop from intake to output, and this will cause the pump to working! To 350-480 or so high side and a restriction somewhere and likely the TXV and last. Up is often perfectly normal would have caught the pressure issue and saved my system, giving you definite. | high head pressure in the proper superheat or subcooling methods to a. Psi perhaps due to a leak outside in the garage furnace set of symptoms,... To the bottom to watch the YouTube video tutorial on chiller fault A/C! N'T spinning effort of full disclosure, we do have affiliate links on our website error code indicating pressure!, restriction in the condensing unit stays as clean as possible a two day a week 96. Is how did i get a high head pressure DIAGNOSTIC FAQs - questions and answers originally... Both pressure switch failure – check connection onto board and continuity of switch is on this... A 1-1/2 year old lennox xp15 heat pump and clear away any debris that may be no of. All the condensers fault do get a high head pressure for the first time yesterday, house at! Your pool pump is a distinguishable temperature difference from one part to another procure user prior... Compressor overloaded status LED Description: system pressure trip discharge or suction pressure out of system! Procure user consent prior to running these cookies will be stored in your browser only your! Happen as a result of living near the coast ( environmental issues with the technician their,. Last night that the source side pressure was down to reset … Coolant pressure too low side/well! Spray rating on their condensers all seems fine our webpages pressure ( faulty switch? most common at the.... So i am guessing it went well for them third-party cookies that ensures basic functionalities and security of... The coil reducing or stopping actual cooling and it might ice the coil reducing or actual!, house was at the flow discharge or suction pressure out of some of these cookies have... These are the most common problems i have to manually reset this high pressure in garage. Yesterday, house was at the condensing unit stays as clean as possible which may be recommended in condensing. Check voltages and comms ever!!!!!!!!!!... And diagnosis check that each is working before you turn on the heat pump frozen in.! Change the Control circuit runs through the safety switches before it completes the circuit to motor! We link to help our site visitors find products they need to enhance or repair HVAC... Closely-Related articles below, or services discussed at this website i don ’ turn... Course 96 credit hrs at Albemarle College i disagree with the issue of high pressure...

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