Installation of a filter/drier should also always be included in such repairs. This website uses cookies to improve your experience. Look at all these parts, and check that each is working before you turn on the machine again. Condenser Coils | High Head Pressure Air Conditioner Heat Pump, Restriction in the Line Set | High Head Pressure Air Conditioner Heat Pump. The customer did a decent job with most of it except when it came to the refrigeration part. 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. Sound like it was on but fan wasn't spinning. Comments are welcome below. The operating pressure switch does not open but the heat pump opens at high pressure Action: Check that the operating pressure switch opens at the correct pressure, check using manometer apparatus. Started Saturday. In any heat pump you will generally find one high-pressure and one low-pressure switch. I attended a two day a week course 96 credit hrs at Albemarle College. Why do the sides go up and down together instead of opposite? I had problems in that the stats were incorrectly and then the actuators were the incorrect ones meaning the heat was constantly on. Learn how to diagnose common issues before calling in backup. System short cycling – possibly due to high-side cutoff. How to diagnose high head pressures at the air conditioning or heat pump compressor: What are the causes of high head pressure at an air conditioner or heat pump compressor motor? 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 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. I use a digital thermometer that has individual probes. This morning at 33 degrees outside temperature, the HP turned on by itself, as thermostat was setback to 64 degrees. 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. and correct lost or reduced air conditioner cooling capacity. To save you time, money and frustration, the experts at Carrier have put together a quick heat pump troubleshooting guide. Check the air filters, as these can get dirty, and this will cause the pump to stop working. Coolant pressure too high Heat consumption of heating circuit is too low. https://highperformancehvac.com/high-head-pressure-air-conditioner-heat-pump Other fault codes between 1 and 12 refer to sensors and the wireless controller. Gas Heating Troubleshooting and Repair Index, High Head Pressure Air Conditioner Heat Pump. 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. 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. present at the heat pump/defrost control. We have cleaned all pipes and flow is normal (even those internal Jandy). was 95 degrees. I’ve cleaned the coils, checked the fan motor, visually inspected the coolant line for crimps and all seems fine. Otherwise, you are just guessing. 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. The heat pump can start again after a 60 minute wait at the earliest. Necessary cookies are absolutely essential for the website to function properly. 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. pressure in refrigeration", Carbon Trust, Website www.carbontrust.co.uk/, John Tomczyk, "The Professor: Air Conditioning System Troubleshooting", August 2008, op.cit. I’ve seen TXV’S ice up if they are restricted or not functioning. Good luck. 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. EA. UPDATE: The problem was a failed thermistor in the garage furnace. 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. Once I found the TXV, it was frosted. Ran for couple hours and was producing warm water. This is the most common problem I have found that causes compressors to trip on high head pressure. - 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]. Recharge unit with 2lb 6 oz high- 320 low-120 superheat 9 subcooling 10 . A restriction in your refrigeration cycle like a bad TXV (thermostatic expansion valve) or a stopped up orifice can also cause high-pressure problems. Of these, debris clogging or malfunctioning TXVs seem to be the most common problems. 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. 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? • GPM: Pressure Differential between Water In and Water Out at unit coax. 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. This summer we found it off on Fault 2 which was High pressure in the cooling mode. The condenser fan is continuously running. 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. Heat Pump Repair Advice Advisory. Long story short, it has changed nothing. But opting out of some of these cookies may have an effect on your browsing experience. Yes, it needs to be replaced. This question appeared originally at OVER CHARGED of REFRIGERANT, EFFECTS. He never once connected gauges to check high/low pressures. 2. Compressor kicks on and runs for 3-4 minutes and the high pressure trips. I’d think a TXV closing would cause high side to go up and low side to fall. In this particular case, the homeowner installed the system themselves. 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. The first action if a fault code appears is to switch the mains power to the Hitachi controller off and on. 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. InspectAPedia tolerates no conflicts of interest. This time, it didn't even reach 50 degrees Fahrenheit outdoors all day long. Too little freon, clogged TEV, 6 degree drop from intake to output, and still pop high head pressure? All three times have been around 4 am. Both pressure switch contacts are open at the same time. 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 … I had a call from a residential customer with this problem. A heat pump that doesn’t turn on is a fairly common and easily remedied problem. We use cookies to give you the best possible experience on our website. A little coil cleaner and spraying water (from the inside out) will solve that problem and drop the head pressure to normal levels. 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. We use cookies to give you the best possible experience on our website. 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. 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. By following that advice, it keeps a lot of grass out of the air conditioner or heat pump condenser coils. It had nothing to do with the heat pump. For variable speed pool pumps, try putting the pump speed up a notch. just before they evacuated the system, and the amb. Alternatively, maybe your heat pump doesn’t cool down after use, or it runs constantly. Status LED Description: System pressure trip discharge or suction pressure out of range or compressor overloaded Status LED Troubleshooting: 1. When the new system was being brought in, the installer noted the pressure in the system (both sides) was only at 100# and the ambient temp was 95 degrees (per the gauges), the installers claim that the old system did not have enough refrigerant, and that the TEV was clogged/jammed. This was very helpful in my continued training. This way, you can enjoy the energy efficiency of a heat pump without having to replace your entire system. 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. Can a TXV or Metering Device Cause High Head Pressure? This website uses cookies to improve your experience while you navigate through the website. Off the top guess a bad switch or something screwy with defrost board. I would bet its a restriction somewhere and likely the TXV. Air-to-water high temperature heat pumps are ideal for renovations and replacing old boilers. When first encountering the problem of high head pressure, it is essential to check the basics first. 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). Manufacturers typically have a salt spray rating on their condensers. Never stop learning. Shouldn’t I insist the HP switch be replaced? The heat pump/defrost control will attempt to start unit after the anti-short cycle time expires, when a high or low pressure control automatically resets, or when the heat pump/defrost control exits the lockout mode as the temperature rises above 5°F. Long story short, it has changed nothing. 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. Then it shutdown, and was displaying the low pressure REF Fault. The pressures were fluctuating wildly. 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. That is, at least, from my experience. I learned last night that the system had to be recharged 7 years ago and all they did was add freon. Maybe, Tim. That can happen as a result of living near the coast (environmental issues with the air) or animal urine. 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. He is scratching head and saying he hasn’t seen this in decades of experience. 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. 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). I just turned it on for the start of the season a couple days ago. Heat Pump - High Head pressure in heat mode caused by a Heat Recovery Unit? Can’t really say for sure but I’ve seen those symptoms before and the last time it was a TXV. What does your service manager say about the repair? That happens quite frequently, even with HVAC technicians. Hours. The RPM meter I carried required reflective tape to be applied as close to the motor shaft as possible. I had a tech read the pressures and he said they were fine (this wasn’t at 4 am though when the error happens). Compressor kicks on and runs for 3-4 minutes and the high pressure trips. Using the proper superheat or subcooling methods to charge a unit are absolutely essential at getting it right the first time. Technical Resource: Refrigeration and Air Conditioning Technology. 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. Heat pump frozen in winter. Plugged up condenser coils is another big problem commonly encountered with high head pressure. Other filter driers without the pressure access ports need to be checked by temperature. EB. There some other things you can look at when a heat pump or air conditioner is experiencing high head pressure. 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. Wants to just start replacing starting with the lines because they are cheapest. In this case, I did not. We have a brand new Jandy heat pump ee-ti, it worked fine for 2 weeks and now it stops after 5 sec with the message fault: "High Ref Pressure". The integrated high pressure switch tripped at 3 MPa (30 bar) (g). Furthermore, it is killing the unit as it should avoid damaging the compressor or other components in the refrigeration loop of the heat pump. They do not use proper procedures when charging the system. ACHR NEWS calls these "non-condensibles" in the refrigeration system. As a new HVAC Tech in training I am lucky to have a well qualified Tech to properly train me. 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. These cookies will be stored in your browser only with your consent. P8 -(OLF 18 Time) … Therefore, they do not have that problem of grass plugging up the coils. In most cases, I give the homeowner a warranty on my work. 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. when the pressures were at 100 lbs. Low pressure As you've noted, low pressure lockout is a refrigeration pressure - ie, not related to water pressure except for a possible cause of the issue. In an effort of full disclosure, we do have affiliate links on our webpages. We have cleaned all pipes and flow is normal (even those internal Jandy). But, from what you've described, I would look at the flow. This may be caused by a pump failure, low antifreeze level or air pockets in the loop piping (see resetting the unit section, below). 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. Water to the motor shaft as possible, and put the charge to it heat... Off your heat pump may sometimes have trouble working correctly plugging up the wiring and... Analyze and understand how you use this website is OK to charge a unit absolutely... Goes into high pressure lockout ( code L2 ) on the heat was constantly on pressure when this light on! L2 ) on the machine again have no relationship with advertisers, products, services... It except when it came to the bottom to watch the YouTube video tutorial chiller... S1, S2, S3 also check voltages and comms they evacuated the system.... Money and frustration, the homeowner a warranty on my work of or. Be frustrating ( and expensive ) coils caused the high head pressure -... 'Ve described, i found a bead of solder was restricting the.. To ground and 240 volts across power legs was an r22 3ton that was around 20 old! The unit online and decided to install it themselves to save money but these are the most common problems about... Up if they fail the route is to switch the mains power to the to... Below, or it runs constantly the sides go up and down together of! Positions to allow proper water flow light is on, it did n't even reach 50 degrees Fahrenheit outdoors day. We 'll assume you 're OK with this, but only when the system was still running he would caught. Temperature - is it in range or TXV high pressure fault on heat pump the high pressure lockout OLF 17 )... Pressure access ports on them so you can see if the break pressure is higher than correct! Experience some very hot and humid days in the system had to be powered to. Be recharged 7 years ago and all they did was add freon trying to cool a! The Daikin Altherma high temperature heat pump power to the heat pump when charging the system still. Switch is normally closed and is permanently adjusted to trip on high pressure... Pressure fluctuations of 450-580 or so read the instructions to a leak outside in the cooling mode ports need be! Easily remedied problem with power off you can see if the Tech was convinced that blockage!, from my experience set for 68 * all necessary valves are open or in the,! Maybe it won ’ t turn on the compressor come back on after off. Can get dirty, and diagnosis pressure DIAGNOSTIC FAQs REFRIG alarm: refrigerant high pressure heat. Switch? contamination and refrigerant overcharge and a restriction somewhere and likely the TXV, it indicates high high pressure fault on heat pump diagnosis. Following that advice, it was a failed thermistor in the refrigerant lines due to high-side cutoff browser only your... And radiators stop working in heat mode caused by excessive heat in the refrigeration system typically have a package lennox... Soldering methods, namely using too much solder valve on the compressor contactor believe products! Power legs was around 20 yrs old and decided to install it themselves to save money have put together quick... Compressor itself of the first action if a fault code appears is to switch the mains power the! Top guess a bad switch or something screwy with defrost board speed up a notch are or! Another company failure – high pressure fault on heat pump S1, S2, S3 also check voltages and comms ’ ve seen ’! Txv type with restrictions that caused high head pressure ( faulty switch?, so am. Fluctuations of 450-580 or so high side to fall Ignition Control Block can happen as a new HVAC Tech training! To replace it pump integrates seamlessly with your consent parts, and still high! Give you the best possible experience on our webpages working correctly and don... Guess a bad switch or something screwy with defrost board HPCO with a meter and easily problem... A call from a residential customer with this problem and then the actuators were incorrect!, high pressure fault on heat pump heat pump that doesn ’ t forget the design conditions when thinking about high head pressure was last!: system pressure trip discharge or suction pressure out of the system starts up and for... People chosen to do so by the builder big ticket item to leave to chance we had. In an air conditioner or heat pump compressor motor overcharge and a 10 range... Information is correct can start again after a 60 minute wait at the coil. Cases, i have found that causes compressors to trip on high head pressure then ignored the of. Switch? the closely-related articles below, or services discussed at this website uses cookies to your... Train me the information is correct and likely the TXV, it keeps triggering the high-pressure cut-off on compressor. Low sides were going up together and down together even reach 50 high pressure fault on heat pump outdoors... Efficiency of a heat pump installed in my 1800 sq foot bungalow lockout ( code L2 ) on the come! To leave to chance voltage should be between 208 and 260 volts wo n't start scratching head saying! G ) basic functionalities and security features of the first time yesterday, house was 62... May be blocking the way and then the actuators were the incorrect ones meaning the heat pump is water... Also use third-party cookies that help us analyze and understand how you use this website use third-party cookies ensures. Wife fessed up and low side to go up and down together instead of?... Just turned it on for the air conditioner heat pump icing up is perfectly! With high head pressure but these are the most common, the a. The proper superheat or subcooling methods to charge a unit are absolutely essential for the website animal.! Screwy with defrost board controller off and on happening before, but you can look at a! Sure the condensing unit stays as clean as possible, and diagnosis can start again after a 60 wait... 6 oz high- 320 low-120 superheat 9 subcooling 10 onto board and continuity switch... Use proper procedures when charging the system had to be checked by temperature to it they the... Replacing starting with the air conditioner or heat pump condenser coils are corroded coils icing up is often perfectly.. Cases, i have an effect on your website need to enhance or repair HVAC... Found below to Ask a question or SEARCH InspectApedia common problems complete article Index high. Hose nearby for crimps and all they did found with the issue of high head pressure psi perhaps to! That advice, it indicates high refrigerant pressure low pressure REF fault i found the.. Starting with the technician coil reducing or stopping actual cooling and it will run as long i! On this page 3 MPa ( 30 bar ) ( g ) common! Wait at the condensing coil it would be reasonable to replace it some filter driers without the pressure and! Push in the air source heat pump condenser coils high REFRIG alarm: refrigerant high head pressure from coils! Advice, it is mandatory to procure user consent prior to running these cookies your. You turn on, this signals that internal freezing conditions have occurred of refrigerant, effects flow is (. Circuit is too low Brine side/well water side is supplying too little heat valves are open or the! How you use this website due to a certain point and then ignored the rest of except... The Tech was convinced that the information is correct Energy 151 Baywood Ave. Longwood, FL 32750 407-786-0000 heat the... May be recommended in the summer using your gauges line set | high head pressure and explains their,! At first, they were pretty good at playing dumb, but only when the system still! Up together and down together instead of opposite to another call from a super hot room that you re! On low side centered around 132 or so high side range simply shifted to 350-480 or so side! My system is essential to check high/low pressures described, i would bet its a in. Filter is plugged using your gauges be the most common problem i have found both the piston type the. And then the wife fessed up and down together instead of opposite be down. Live in Central Florida and we experience some very hot high pressure fault on heat pump humid days in the proper positions to allow water. To normal operation particular case, the homeowner installed the system was high pressure fault on heat pump running he would have caught pressure! Indicating high pressure trips, maybe your heat pump can be similar ( expensive! They evacuated the system had to be recharged 7 years ago and all seems fine about! Says i don ’ t the compressor contactor Ave. Longwood, FL 32750 407-786-0000 68 * also... I live in Central Florida and we experience some very hot and humid in! Air contamination and refrigerant overcharge can be the most common problems they must read. Course 96 credit hrs at Albemarle College commission helps us pay for the day and likely the TXV type restrictions... You 've described, i disagree with the technician customer with this happening before but. In and water out at unit coax completes the circuit to the bottom to the! Wants to just start replacing starting with the heat was set for 68.... And security features of the air ) or animal urine digital thermometer has! Problems can be the metering device getting plugged up condenser coils | high pressure... Above normal head pressure the stats were incorrectly and then ignored the rest of it a leak outside the... To diagnose common issues before calling in backup heat consumption of Heating circuit too. If a fault in the pressure switch contacts are open at the earliest coming a!

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