Question about Hitachi RAS-09UH Air Conditioner

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Hitachi Soleus split Not blowing cool air.

Have a Hitachi Soleus split unit KFR-18GW(D). Not cooling. Called in a licensed master plumber. He put freon in. Pressure set at 40. Didn't work. He jumped wired to test compressor. Compressor would not kick in so he replaced compressor with a new one from manufact. After replacing it the sensor lite blinked 4 times and according to manual, this means compressor is not working. Shut down unit from electrical box because there isn't a manual shut off on unit only on remote. Still won't work. Plumber has been here 5 times since unit went on fritz. Heat valve not clicking in. Need to know if there is any help for us or should the unit be junked (Only 3rd summer unit has been used). a.petino@comcast.net

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If the freon is 410a the pressure must be 100-120psi,if it is 22 the pressure must be 45-55psi.you unlucky because hitachi havent problems with compressors.is it inverter the unit?if it is you must check the outdoor pc board,if the 4valve clicking in the you must replaced it propably has stucked.

Posted on Jul 09, 2009

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SOURCE: my Soleus KFR-18GW Split

Check your thermostsat see if there is a fan switch on it set it to auto

Posted on Aug 19, 2010

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If the top of the compressor is freezing you either have low refrigerant or a restriction in the coil. Check the air filter and change if necessary. Turn the outside unit off using the outside disconnect found a few feet away from the condenser. Let the indoor unit blow air for a few hours to melt the ice off of the coil. Turn back on the outside unit and after about a half hour, you should feel the cool air from your ducts. If the cool air gets warmer over the next hour, you will need a tech to look for leaks and recharge your unit. If it continues to blow warm air even after the 3-hour wait, you have other issues. To answer your original question, on the indoor unit you will find access panels that can be removed for inspection and cleaning. They are commonly located where a 3/4" drain pipe exits the cabinet. While the unit is off, remove these panels and inspect for a buildup of debris. Good Luck!

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