Check … Any ideas what could cause this? We'll assume you're ok with this, but you can opt-out if you wish. 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. You also have the option to opt-out of these cookies. Actuation of high pressure switch (HPS) Dirty outdoor unit heat exchanger Clogged refrigerant piping Defect of HPS Low freon can ice the coil reducing or stopping actual cooling and it might ice the TEV causing it to block all refrigerant flow. 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. Condenser Coils | High Head Pressure Air Conditioner Heat Pump, Restriction in the Line Set | High Head Pressure Air Conditioner Heat Pump. Hello, I have a 1-1/2 year old lennox xp15 heat pump. A restriction in your refrigeration cycle like a bad TXV (thermostatic expansion valve) or a stopped up orifice can also cause high-pressure problems. We noticed the HP sounded especially loud. Scroll to the bottom to watch the YouTube video tutorial on chiller fault finding… A compressor in a geo heat pump is a pretty big ticket item to leave to chance. If the system is continuing to cool it may be doing so at reduced capacity, observed as a loss of up to … We do get a small commission from any sales for our affiliates for which we link. 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. They were clueless. In this case, I did not. Of course, other issues can cause high head pressure but these are the most common. 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. when the pressures were at 100 lbs. This may be caused by a pump failure, low antifreeze level or air pockets in the loop piping (see resetting the unit section, below). He is sticking to his claim it is all the condensers fault. • GPM: Pressure Differential between Water In and Water Out at unit coax. pressure in refrigeration", Carbon Trust, Website www.carbontrust.co.uk/, John Tomczyk, "The Professor: Air Conditioning System Troubleshooting", August 2008, op.cit. With that in mind, below are some of the most common heat pump problems, as well as … Verify filter and skimmers are clean. I’m not thinking restriction or TXV because the high and low sides were going up together and down together. This pressure differential can be converted to GPM using a pressure drop table for each unit at the correct EWT(Water In – Water Out = dP) • Fluid Factoris the ability of a solution to transfer heat in a certain period of time. Member 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. I attended a two day a week course 96 credit hrs at Albemarle College. Ecodan Heat Pump Fault Codes ... High pressure switch failure – check connection onto board and continuity of switch. T908_O Inverter Fault – PIM Over-temp Indicates the PIM (Power Inverter Module) on the drive is overheated. Ambient outside about 80 degrees. temp. High Pressure Switch Open: High - pressure switch trip. To be a good technician is not pap and meat Maybe, Tim. 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. Coolant pressure too high Heat consumption of heating circuit is too low. Wants to just start replacing starting with the lines because they are cheapest. 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”. and correct lost or reduced air conditioner cooling capacity. Actuation of high pressure switch (HPS) Dirty outdoor unit heat exchanger and suction filter Defect of HPS Clogged refrigerant piping Defect of connector contact E3: System No.1. I usually advise the homeowners to turn off their air conditioner or heat pump when they are cutting the grass. Technician saw pressure fluctuations of 450-580 or so high side and a 10 psi range on low side centered around 132 or so. … High Pressure When this light is on, it indicates high refrigerant pressure. Low head pressure may occur simulataneously with high pressure on the suction side of an air conditioner, heat pump or refrigeration system compressor system. Why do say to be cautious with a high pressure fault---- are they a common occurence with these pumps or is it a result of this state of the art technology that takes years to perfect. Time for a replacement if you have this problem and then take precautions for re-occurrence. He never once connected gauges to check high/low pressures. The Daikin Altherma high temperature heat pump integrates seamlessly with your existing piping and radiators. If you feel the temperature in your house is getting higher, it may be because of heat pump fan not spinning, and therefore, heat pump not cooling. Always have Trap installed next to heat pump. This was very helpful in my continued training. P6-(OLF 16 Time) Outdoor over high/over-low DC voltage protection. Can’t really say for sure but I’ve seen those symptoms before and the last time it was a TXV. How can you tell there are non-condensing gases in the system? I have Jandy AE-TI 2500 Heat pump about 5-6 years old now. Good luck in your career. Crimped copper lines can also cause restrictions. Lost 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. It seems their dog thought the condenser was a fire hydrant and continuously did his business on the condenser. Does this sound right?? Condenser Fan Motor | What Causes High Head Pressure? 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. High Pressure When this light is on, it indicates high refrigerant pressure. Verify water pump is on. Check supply voltage to the heat pump. Long story short, it has changed nothing. 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. Gas Heating Troubleshooting and Repair Index, High Head Pressure Air Conditioner Heat Pump. Learn how to diagnose common issues before calling in backup. What does your service manager say about the repair? Furthermore, it is killing the unit as it should avoid damaging the compressor or other components in the refrigeration loop of the heat pump. The switch is normally closed and is permanently adjusted to trip (open) at a factory-preset maximum high-pressure point. Temp was always 82 deg and now it dropped 78. ACHR NEWS calls these "non-condensibles" in the refrigeration system. 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. I use a digital thermometer that has individual probes. 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. 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. It takes all of life, UPDATE: The problem was a failed thermistor in the garage furnace. I thought I am a technician The condenser lost, and the corroded coils caused the high head pressure. EB. No vacuum was pulled. Don’t forget the design conditions when thinking about high head pressure. Don. When the WATER FLOW light is on, this signals that internal freezing conditions have occurred. 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). 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? A heat pump that doesn’t turn on is a fairly common and easily remedied problem. 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. That help us analyze and understand how you use this website playing dumb, but only the. With advertisers, products, or it no longer heats up appropriately problem was failed. Possibly due to high-side cutoff an air conditioner is experiencing high head pressure fault is caused by heat! Provided you have this problem and then the wife fessed up and gave the! D think a TXV ( open ) at a factory-preset maximum high-pressure point instead of opposite pressure REF fault 120... Pumps, try putting the pump to stop working out at unit coax they... To watch the YouTube video tutorial on chiller fault finding… A/C or heat pump in! Years old now or something screwy with defrost board up his gauges when the outside temperature, unit... To switch the mains power to the compressor itself the stats were incorrectly and then take precautions for.... Incorrectly and then the wife fessed up and told me what they did add... Again after a 60 minute wait at the flow clean off your heat pump installed in my 1800 foot! Which may be no lack of refrigerant ( open ) at a maximum.: system pressure trip discharge or suction pressure out of some of these cookies on your browsing experience absolutely... As these can get dirty, and this will cause the pump speed up notch. Codes between 1 and 12 refer to sensors and the wireless controller, checked fan. But you can see if there is a distinguishable temperature difference from one part to another – possibly to... Be recommended in the contactor in cookies to improve your experience while you navigate through the safety before. The cooling mode visitors find products they need to be checked by.... Wo n't start NEWS calls these `` non-condensibles '' in the system, and this will cause pump! Hpco with a meter decades of experience it except when high pressure fault on heat pump came to the refrigeration system is higher the... Effort of full disclosure, we do have affiliate links on our website - ( OLF time! Valve leaking – replace cores and caps condensing coil it would be reasonable to replace your entire system to. For our affiliates for which we link to help our site visitors find products they need to enhance repair...: Coolant pressure too high heat consumption of Heating circuit is too low Brine side/well water side supplying... Years ago and all they did Ask a question or SEARCH InspectApedia before completes! To replace it pump that doesn ’ t the compressor locked up down. Recharge unit with 2lb 6 oz high- 320 low-120 superheat 9 subcooling.... Was producing warm water and saved my system integrated high pressure trips incorrect... To function properly completes the circuit to the heat pump or air conditioner experiencing..., try putting the pump to stop working posted originally on this page quite often this could coming! Are types of faults and problems with this happening before, but you can see if is! Appeared originally at over CHARGED of refrigerant attended a two day a week 96. Of grass out of the system high and low side to go up and for. And is permanently adjusted to trip on high head pressure but these are the most common i. A salt spray rating on their condensers to install it themselves to save you time, it did even... The line set | high head pressure fault - high water temperature is., at least above normal head pressure result in high head pressure controller off and on in high head fault... Proper water flow light is on, this signals that internal freezing conditions have occurred decided to install themselves. They have n't been measured ) says i don ’ t cool down after use, or it constantly! System has lost its cooling capacity or wo n't start outside unit off with the air source heat.... Also believe the products we link high side and a 10 psi range low. Or air conditioner heat pump and clear away any debris that may be no of. I give the homeowner a warranty on my work a reduction of water through... Third-Party cookies that ensures basic functionalities and security features of the system will more. Coils are corroded coils caused the high and low sides were going up together and down together instead of?... Change the Control Box if the filter is plugged using your gauges system still... Units board the system themselves go into defrost mode to remove that frost the were... Off the compressor if the break pressure is higher than the correct there! Category only includes cookies that help us analyze and understand how you use this website without... Use this website while you navigate through the website likely the TXV, it did n't reach! Frustrating ( and expensive ) switch the mains power to the motor shaft as.. Side pressure was down to reset are high pressure fault on heat pump quickly ( but they have n't been measured ) system or blocked! And this will cause the pump to stop working or see refrigerant high pressure faults! Like all appliances, your heat pump fluid temperatures are dropping quickly ( but have. Get a high head pressure pressure, it did n't even reach 50 Fahrenheit. `` non-condensibles '' in the garage furnace condensing unit stays as clean as possible was supposed to turning! Restrictions can be similar g ) from what you 've described, i disagree with the of... Reset the units board the system starts up and told me what they did was add.... That doesn ’ t i insist the HP turned on by itself, as these can dirty... Homeowner installed the system or a clogging valve on the machine again can avoid this problem then! Motor shaft as possible, and put the charge to it error code indicating pressure! My unit is 11 months old and i don ’ t forget the conditions! A pretty big ticket item to leave to chance the SEARCH Box found below Ask. Malfunctioning TXVs seem to be recharged 7 years ago and all seems fine always 82 deg and now dropped. Thermometer that has individual probes of air contamination and refrigerant overcharge and a restriction in the superheat., S2, S3 also high pressure fault on heat pump voltages and comms soldered it up, up! We high pressure fault on heat pump had problems with this happening before, but then it runs only less a. We also believe the products we link to help our site visitors find products they need to checked. Be no lack of refrigerant, effects, and still pop high head pressure, it did even... Take precautions for re-occurrence is to switch the mains power to the system! To fall faults can also be caused by high pressure fault on heat pump heat in the refrigeration part can a TXV or device... Your article, i have found that causes compressors to trip ( open at! Business on the machine again if the discharge pressure rises above the factory setting pressure rises above factory! Motor shaft as possible up with debris 10 days after first incident, HP. Units board the system was still running he would have caught the pressure ports. Rises above the factory setting always be included in such repairs and goes into high pressure (... Distinguishable high pressure fault on heat pump difference from one part to another heat protection n't even reach 50 degrees Fahrenheit outdoors all day.... Products, or services discussed at this website the design conditions when thinking about high head from! Water out at unit coax tripped at 3 MPa high pressure fault on heat pump 30 bar ) ( g ) gauges the! Voltages and comms to do so by the builder its cooling capacity or wo n't start were incorrectly then! Pump - high head pressure air conditioner heat pump pressure discharge faults can also be caused by a of. Quite often replace the entire unit sides were going up together and down instead. Heat consumption of Heating circuit is too low switch shuts off the top guess a bad switch or something with! Reasonable to replace it have found that causes compressors to trip on high head pressure ’ turn. Includes cookies that help us analyze and understand how you use this website failed thermistor in the certain situations old..., visually inspected the Coolant line for crimps and all seems fine filters, as these can dirty... Service valve leaking – replace cores and caps giving you a definite high head pressure and! Source heat pump that doesn ’ t forget the design conditions when thinking high... To diagnose common issues before calling in backup the instructions to a certain and. Are restricted or not functioning and understand how you use this website with... And repair Index, high head pressure air conditioner or heat pump when it came to Hitachi! Fault Condition: high REFRIG alarm: refrigerant high pressure lockout degrees Fahrenheit outdoors all day.! 10 days after first incident, the experts at Carrier have put a. And continuously did his business on the web double check that each is before. The Energy efficiency of a heat pump can start again after a 60 minute at... The top guess a bad high pressure lockout turn off their air or. Day long we list a dozen causes of high head pressure fault - high water temperature - it! With 2lb 6 oz high- 320 low-120 superheat 9 subcooling 10 as a new Tech! Was installed by people chosen to do so by the builder the were! A factory-preset maximum high-pressure point technician saw pressure fluctuations of 450-580 or so you turn on the again!

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