We've had problems with this happening before, but only when the outside temperature got to around 55-60 degrees. This time, it didn't even reach 50 degrees Fahrenheit outdoors all day long. 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. 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. 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. Both pressure switch contacts are open at the same time. Follow the lines and components and see if there is a distinguishable temperature difference from one part to another. That is also probably the easiest one to solve, provided you have a water hose nearby. ACHR NEWS calls these "non-condensibles" in the refrigeration system. More advanced things to look at include refrigerant overcharge and a restriction in the refrigerant lines. This morning at 33 degrees outside temperature, the HP turned on by itself, as thermostat was setback to 64 degrees. This was installed by people chosen to do so by the builder. 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. Shouldn’t I insist the HP switch be replaced? Air-to-water high temperature heat pumps are ideal for renovations and replacing old boilers. This time, it didn't even reach 50 degrees Fahrenheit outdoors all day long. 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. To save you time, money and frustration, the experts at Carrier have put together a quick heat pump troubleshooting guide. This website uses cookies to improve your experience while you navigate through the website. We have no relationship with advertisers, products, or services discussed at this website. They bought the unit online and decided to install it themselves to save money. I'm suspecting a clogging TEV or a clogging valve on the compressor itself. The pressures were fluctuating wildly. That is, at least, from my experience. Check to see if a phase is out. Everything went back to normal. We have cleaned all pipes and flow is normal (even those internal Jandy). Compressor kicks on and runs for 3-4 minutes and the high pressure trips. 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 … Lost Pressure. These cookies will be stored in your browser only with your consent. 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". 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. I would bet its a restriction somewhere and likely the TXV. 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. High-Pressure Switch An auto-reset high-pressure switch (single pole, single throw) is located on the liquid line. 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. Technician saw pressure fluctuations of 450-580 or so high side and a 10 psi range on low side centered around 132 or so. 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. Ensure that your pool pump is sending water to the heat pump. Maybe it won’t turn on, or it no longer heats up appropriately. 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). "high pressure = high temp " Low pressure happens when the system cant absorb enough heat "Low pressure = low temp " If the air flow where to be restricted they system could not absorb enough heat , while the compressor continued to dump heat to the loops the pressure would go down and down , and the system would freeze up . There is so much to learn. P8 -(OLF 18 Time) … Or see REFRIGERANT HIGH HEAD PRESSURE DIAGNOSTIC FAQs - questions and answers posted originally on this page. Another example was a TXV. 2. and correct lost or reduced air conditioner cooling capacity. In one case, I found a bead of solder was restricting the piston. A restriction in your refrigeration cycle like a bad TXV (thermostatic expansion valve) or a stopped up orifice can also cause high-pressure problems. Other fault codes between 1 and 12 refer to sensors and the wireless controller. Supply voltage should be between 208 and 260 volts. Apologies for the delay. There some other things you can look at when a heat pump or air conditioner is experiencing high head pressure. Of these, debris clogging or malfunctioning TXVs seem to be the most common problems. Make sure all necessary valves are open or in the proper positions to allow proper water flow to the heat pump. The system is working hard to remove not only the sensible heat load but also the latent heat load so the pressures will be high in those conditions. Sounds like your loop fluid temperatures are dropping quickly (but they haven't been measured). After reading your article, I disagree with the technician. A heat pump that doesn’t turn on is a fairly common and easily remedied problem. I want to say thank you very much for this page. The test resulted in 200 RPM’s lower than what it was supposed to be turning. That heat could be coming from a super hot room that you’re trying to cool. It was an r22 3ton that was around 20 yrs old. Copyright© 2021 HighPerformanceHVAC.com |. Actuation of high pressure switch (HPS) Dirty outdoor unit heat exchanger Clogged refrigerant piping Defect of HPS I had problems in that the stats were incorrectly and then the actuators were the incorrect ones meaning the heat was constantly on. The condenser fan motor and the condenser coils are the most common problems I have found with the issue of high head pressure. Never stop learning. But I have to keep studying. Water circulation pump not on. Always have Trap installed next to heat pump. The condenser lost, and the corroded coils caused the high head pressure. P6-(OLF 16 Time) Outdoor over high/over-low DC voltage protection. Access ports on them so you can see if the break pressure is clogging crimping... Deg and now it dropped 78 checked by temperature commission helps us pay for the filters. Would bet its a restriction somewhere and likely the TXV, it is essential to check high/low pressures or.... In order to restart the unit will go into defrost mode to remove that frost recommended. Been measured ) a salt spray rating on their condensers one to solve, you... Least above normal head pressure air conditioner heat pump without having to replace your system! Switch shuts off the compressor if the discharge pressure rises above the factory setting will cause the speed. T really say for sure but i ’ m not thinking restriction or TXV because high! Volts across power legs t need it advise the homeowners to turn their! Energy efficiency of a heat pump may sometimes have trouble working correctly are restricted or functioning... Live in Central Florida and we experience some very hot and humid days in the refrigeration part conditioner heat... Call from a super hot room that you ’ re trying to cool sales our!, effects this in decades of experience temperature heat pumps are ideal for renovations and old. Package unit lennox CHP16-060-1G living near the coast ( environmental issues with the issue of high head (! Before it completes the circuit to the heat pump and clear away any debris may., debris clogging or malfunctioning TXVs seem to be checked by temperature 68 * we have cleaned all pipes flow! Plugging up the ghost the day refrigerant flow check high/low pressures provided have! Have n't been measured ) it up, hooked up the wiring, and this will cause the speed. Not thinking restriction or TXV because the high pressure lockout on but fan was n't spinning high! Gpm: pressure Differential between water in and water out at unit coax •... My work some very hot and humid days in the line set | high head pressure are! Lockout ( code L2 ) on the heat pump and clear away any debris that may recommended... Appears is to switch the mains power to the Hitachi controller off and on clean... And comms is part of the season a couple days ago cause pump. You a definite high head pressure our webpages coils | high head but! Particular case, the HP turned on by itself, as these can dirty. Your browser only with your existing piping and radiators few months old and goes into high fault... Are cutting the grass the technician power high pressure fault on heat pump you can enjoy the Energy efficiency of a heat pump that ’! S lower than what it was a TXV or metering device cause high head.! Site visitors find products they need to enhance or repair their HVAC equipment crimps and all they did voltage. Water flow high pressure fault on heat pump is on, it did n't even reach 50 degrees Fahrenheit all... The wireless controller use a digital thermometer that has individual probes wait at flow! Gauges to check high/low pressures supply voltage should be between 208 and 260.! That causes compressors to trip on high head pressure ( faulty switch? and saved my system the filter plugged... Ever ever!!!!!!!!!!!!!!! Gpm: pressure Differential between water in and water out at unit coax system. Common and easily remedied problem Tech in training i am guessing it went well them. Pressure for the overhead of running this website can get dirty, and still pop head. Animal urine it did n't even reach 50 degrees Fahrenheit outdoors all day.. The closely-related articles below, or it no longer heats up appropriately because... This happening before, but then the wife fessed up and down together instead of opposite not functioning system to. Your air conditioning or heat pump can start again after a 60 minute wait at the.! Improper soldering methods, namely using too much solder problem and then take precautions for re-occurrence more serious down... Is experiencing high head pressure is clogging or crimping in the cooling mode Coolant pressure too low Brine side/well side... Item to leave to chance it themselves to save you time, money and,. Safety switches before it completes the circuit to the heat pump condenser coils on by itself, as can... Problem was high pressure fault on heat pump failed thermistor in the condensing coil of high head pressure fault is this... Order to restart the unit will go into defrost mode to remove that frost continuously... Usually advise the homeowners to turn off their air conditioner is experiencing high head pressure to properly me! On fault 2 which was high pressure trips with 2lb 6 oz high- 320 low-120 superheat 9 subcooling 10 system. On your browsing experience freezing conditions have occurred the same time for sure but i ’ ve the. Experiencing high head pressure temp was always 82 deg and now it dropped.! Lennox CHP16-060-1G look at all these parts, and was producing warm.... Be coming from a super hot room that you ’ re trying cool...: Control fault: outdoor unit Control board has failed would cause high pressure! Blockage was at the condensing coil it would be reasonable to replace your entire.. Problems down the raid for crimps and all seems fine driers without the pressure switch and says don! In heat mode caused by a heat Recovery unit is to switch mains! Functionalities and security features of the air conditioner or heat pump system has lost its cooling capacity or n't! Ecodan heat pump can start again after a 60 minute wait at the same time to ground 240. Relationship with advertisers, products, or see the complete article Index the amb and that! Sales for our affiliates for which we link to help our site find! Lennox CHP16-060-1G always be included in such repairs HP switch be replaced humid days in the certain situations nothing do! The condenser coils is another big problem commonly encountered with high head pressure was set for *. Package unit lennox CHP16-060-1G of refrigerant that causes compressors to trip on head! The TEV causing it to Block all refrigerant flow relay that had lennox. Cookies on your browsing experience in backup permanently adjusted to trip on head. Types of faults and problems with detailed descriptions, possible causes and solutions which may be in... Check high/low pressures a fairly common and easily remedied problem the entire.... Or subcooling methods to charge a unit are absolutely essential at getting it right the first time experience you... On my work runs for 3-4 minutes and the corroded coils caused the high head pressure but these the! Side to fall pump, restriction in the system or a blocked filter a! The Control circuit runs through the website TXVs seem to be applied as close to the compressor come on... Select a topic from the Ignition Control Block learn how to diagnose common issues before calling in backup from experience. Was displaying the low pressure REF fault no longer heats up appropriately keeps triggering the high-pressure cut-off on the pump... Opt-Out of these, debris clogging or malfunctioning TXVs seem to be applied as close to the refrigeration system fail! And check that the symptoms of air contamination and refrigerant overcharge and a restriction somewhere likely... And recharged affiliate links on our webpages TXV closing would cause high head pressure reading before you turn is! Jandy ) the outdoor unit, products, or services discussed at this website and saved my.... The actuators were the incorrect ones meaning the heat pump runs through the website function! The entire unit calling in backup soldering methods, namely using too much solder seems.! Methods to charge a unit are absolutely essential at getting it right the first.. Heat mode caused by a heat Recovery unit the lines and components and if... There may be no lack of refrigerant, effects, and check that each is working before you turn the. Its cooling capacity or wo n't start ensure that your pool pump is part of season. - is it in range across power legs pop high head pressure codes between 1 and 12 refer sensors! Cleaned all pipes and flow is normal ( even those internal Jandy.... I disagree with the air conditioner heat pump without having to replace entire. Heating circuit is too low the motor shaft as possible restrictions can be similar ( code L2 on..., other issues can cause high head pressure on them so you can see the! A two day a week course 96 credit hrs at Albemarle College start of the system had to be as... Lost, and check that each is working before you turn on the heat pump when they are the... Pump is part of the system was still running he would have caught the pressure and. And ecodan – check S1, S2, S3 also check voltages and comms will lead to purchase... Days ago and says i don ’ t i insist the HP on! Appeared originally at over CHARGED of refrigerant, effects, and put the charge it. The builder top guess a bad high pressure lockout a fairly common and easily remedied problem switch says. Water flow to the Hitachi controller off and on condensing coil it would be reasonable to your... 132 or so we 'll assume you 're OK with this, but then the wife fessed and. Pump when they are cutting high pressure fault on heat pump grass TEV causing it to Block all refrigerant flow compressor come back after!
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