There are types of faults and problems with detailed descriptions, possible causes and solutions which may be recommended in the certain situations. I hope that someone will see your post and have some knowledge about this Nordyne AC unit. 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. We carry a huge range of brand name items that can be purchased online. God bless you and your family today and always! When there is a call for heat, the thermostat will send 24V to the outdoor unit on the 'Y' wire , and send 24V to energize the reversing valve on the 'O' wire . I know its 248 “coming in” because there are three wires, white, black, and a gnd. There have been lots of problems with TXV valves so this could be the problem or you might have a fan motor that is running too slow. Below we list a dozen causes of high head pressure in an air conditioner or heat pump compressor motor. Long-lasting materials. The unit gets a lot of use in the summer, e.g. So I’m wondering why the compressor stops running. 5. Systems is few months old and goes into high pressure lockout (code L2) on the heat pump. Check air distribution on coil. This is about a 3 to 4-hour job and can be pretty expensive. If you are not at home and the air conditioner continues to run under high pressure this could damage the compressor and you would either need a new compressor or a new unit. A restriction in your refrigeration cycle like a bad TXV (thermostatic expansion valve) or a stopped up orifice can also cause high-pressure problems. Problems that would cause high head pressure would be a dirty condensing unit, slow fan motor, over-charge or refrigerant or a blockage in the refrigeration cycle. The outside condenser would make a loud chattering sound and the compressor would shut off. -If ambient above 110*F or below 0 # F compression ratio could be too high for low speed operation. I know it can be a pain trying to figure out what is wrong. Or if we leave it on and go out (I take a family member to medical appointments and we might leave ac on low for a few hours on a hot afternoon). Fan will kick off and board shows a low pressure lockout. Soon thereafter, we would still hear the noise. I had a Copeland scroll compressor that did this and it turned out to be a stuck check valve that was in the high-pressure discharge line of the compressor. The RP14 is our 14 SEER heat pump and is part of the Rheem heat pump product line that extends from 14 to 20 SEER. I have a very similar problem on my outside Lennox AC unit. If that does not work you might need to install gauges and see what the pressures are running in the heating mode. Check and tighten all connections. Plus you'll find a range of choices unmatched in Australia. On heat pumps the indoor coil becomes the condenser in the wintertime and if you are not getting enough airflow across the indoor coil it with cause the high-pressure code problem. – Home Heat Problems -Check model data card is properly connected. Running low on refrigerant and other problems can most certainly shorten the life of a unit. Lots of helpful info. PayPal, Secure Credit Card, Amazon Payments, and Mail in Check or Money Order. 3. Steve. Air should come out of the top of your unit. -Outdoor ambient is above 125 # F. Allow unit to cool and condensing pressure to reduce before restarting. Its working right now but my question is this a good idea? I was not home when they started and had them stop. The compressor is Coperland scroll ZR34K3-PFV-130 A new Evap coil (RCSA … Any guidance would greatly be appreciated. Since your high-pressure switch is open then this could be caused by a bad high-pressure switch, an outdoor fan that does not work, a dirty condensing unit, or a restriction in your refrigerant system. If you are in cooling mode with the new outdoor unit is going off on the high-pressure safety switch then I would think that your unit is over-charged or you have a restriction in the refrigeration cycle. I would recommend testing the capacitor first. My best guess would be that the compressor is over-heating and going off on thermal overload. Your outdoor unit has to be clean to run properly under high outdoor temperatures. My warranty company provided a Goodman when I wanted a York. -ICC will clear this fault and restart independently. • At compressor terminals, voltage must be ± 10% of nameplate marking when unit is operating. High-pressure switches are usually set to trip at a little over 300 psi. A dirty outdoor coil. Steve, I can push the contactor in and the fan comes on, but when I release it stops. Replace air filter. Pulled them, reran new, hooked it all back up and wallah! • Check for correct voltage at compressor. Heat Pump Problem. Check low voltage connections (G.Y W. R. C) at motor. I will let you decide who is at fault. In supply air stream, out of calibration, Poor system control using capillary tubes, Adjust air flow to 400 CFM [188.8 L/s]/Ton, Recover charge, install filter-drier, evacuate system, recharge, Remove restriction in liquid line Correct the refrigerant charge, Misapplication of internally equalized valve, Remove external equalizer line restriction, Loss of charge from power head sensing bulb, Charge migration from sensing bulb to power head (Warm power head with warm, wet cloth. Bought new wire and air return filter for $ 15, ran it, it. In high pressure lockout @ Rheem a ranch house, 1480 sq ft heated area about! 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