Question about Intertherm P3RA-048K Air Conditioner

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Cooling unit is frosting up, and condisation is buildig up in the duct work.

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Bad airflow or low refrigerant. Bad blower motor, dirty coils.Suction pressure should be approximately 68psi.

Posted on Jun 16, 2009

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It cools great when first turned on. After so many hours of cooling it stops cooling


Have you checked up in filter area at ceiling to see if fins are frozen or frosted bad? If they are dirty, they can cause frost/ice and AC goes in to fan only until frost/ice is gone. When did unit actually get a good cleaning last? Too many registers closed or blocked can cause freeze up as well. Does this unit have ducted or non-ducted system?

Aug 18, 2013 | Dometic Rooftop RV Air Conditioner

1 Answer

Freezer cools well, refirgator is warm, the vent that brings air from frezer to refrigator has no air movement, ice inside , i broke some ice with knife shoul di spray hot water to get rid rest , I did...


This answer will be somewhat long, but in order to understand the "fix" for your problem you need to understand how a refrigerator-freezer works.

Most units have ONE COMPRESSOR which usually cools the FREEZER. Then, to cool the fridge area, there is a DUCT or ducts between the freezer and the fridge area to move some small amount of very cold freezer air into the fridge section. In the old days this occurred by convection, but most newer units have a small fan in the duct to more dependably move the air.

The run time of the compressor, and thus the temperature of the freezer is usually controlled by a THERMOSTAT [usually with numbers on the dial]. A second control [usually with the letters A, B, C, and sometimes even D] operates either a DAMPER in the duct, or controls the duration of fan operation in order to control the temperature in the fridge section.

Under certain conditions of higher humidity, FROST [fine ice crystals] can build up in the duct, and on the fan if there is one, reducing or totally blocking the cold air flow from the freezer to the fridge section.

From your description of the freezer working well, but the fridge section being "warm" suggests that blockage of the duct is what has happened. However, there are a couple of other possibilities:

1. You inadvertantly moved the fridge control to a warmer setting,
2. You inadvertantly placed something in the freezer and/or fridge which BLOCKED the entrance or exit of the duct,

IF one of the above are the cause, a "manual" defrost of a few hours with the freezer and fridge doors open to allow warmer air in should melt out any frost/ice from the duct and allow the system to work properly. Depending on the severity of the frost/ice buildup, it could take a couple of days to fully melt all the frost/ice.

During the manual defrost ALL frozen and perishable foods should be temporary stored in an ice chest or cooler of some kind.

One more thing, in addition to heavy humidity, frost/ice buildup can also be caused by a defective automatic DEFROST TIMER. IF the system does not do its regular defrost cycle [usually an hour or two once in each 24 hours], then frost/ice buildup can occur even with "normal" humidities.

So, once you have the system back in operation, watch for the normal cycling of the defrost program, and if the problem continues, contact a qualified refrigeration repair technician to repair or replace the defrost TIMER.

Jul 13, 2011 | Refrigerators

1 Answer

CDA CI785/2 fridge not getting cold in fridge part. but the freezer works ok


If freezer is working then you must check for the cool air to come from the freezer coils. Shut off the fridge and check for the working of the fan, check the ducts from the freezer to the fridge. once you have confirmed the fan and the ducts and have cleaned up the coils, you can switch on the fridge. Notice if the fridge is cooling now, if so check later for any timer failure for frost build up blocking the duct. Keep an average setting for the fridge and freezer. Hope you try this out.Good day

Aug 10, 2010 | Refrigerators

1 Answer

Left door open, closed next day, but only blowing cool air now


You will need to turn the unit off and let it completely unthaw. There is frost that builds up in the ducts and behind the panels when the door is left open that will cause the unit to not cool or circulate where needed.

May 10, 2010 | Frigidaire 20.3 Cu. Ft. Frost-Free Upright...

2 Answers

The front ac unit has very poor cooling and left running, freezes up and drips water out of the ceiling grill. I s the unit shot?


Ensure the air filter and evaporator coils are clean. If they are clean and everything is running properly, then the unit may need refrigerant. It depends on the age of your equipment and the location of the leak (price to repair) as to whether or not the unit is shot. Check your air filter and evaporator coil first. :-)

Apr 18, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Stops blowing air


remove cover at ceiling so you can see in at fins and see if they are frosting up bad. If they are, I suspect during AC installation, they didn't open up ducts on discharge properly and air flow is restricted, which will cause freeze up, especially if low flow from discharge ducts. I'm assuming it is a ducted system. You may have to remove or drop down entire ceiling assy, to see if the ducts into ceiling have any blockage. Sometimes they don't cut rubber roof material back far enough, or misaligned ducts and cause restricted flow to ceiling vents, which will cause unit to frost up, which kicks out compressor until frost is melted, then compressor kicks back in and cooling happens again.

Apr 06, 2010 | Dometic Rooftop RV Air Conditioner

2 Answers

The refridgerator is not cooloing and the freezer is beginning to frost up


This sound if the blower motor in the freezer section is not working, everything freezes and the bottom does not cool, you will need to remove the cover in the back of the freezer and if the fan is not working it will need to be replaced

Oct 30, 2009 | Refrigerators

1 Answer

Duo Therm RV air conditioner inadequate cooling


The rule of thumb is 20F difference (lower) than ambient temperature. Most manufacturers will tell you 20 F degress is about normal. In your case it does sound a little warm, but I need to ask, sorry. Was it working o.k. before in same basic temperatures? Have you cleaned coils & fins good on Evaporator & condenser recently? Have you removed filter inside & cleaned it as well, and looked to see if coils are frosting up by chance? Is this a ducted or non ducted system? I'm guessing on a 5th wheel, it is ducted, so make sure you have good discharge on all of those as well. Any blockage or restriction on the discharge side will also cause the problem. Keep me posted on what you find.

Aug 31, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Fujitsu general ars40 duct type


you have to clean your A/C unit, indoor and outdoor, be sure all frost are de frosted before you run your unit again, or else it will frost again. if this not work your unit need re-gassing.

Jan 20, 2008 | Fujitsu 24R1 Air Conditioner

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