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I have a robinair cool tech model 34800 and sale is showing over 15 lbs of freon in the tank but when you try to charge vehicle,display says low refrigerant,have you heard of this and is there a fix?thanks

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You may have one of those problem. 1# Machine is showing wrong weight. if so you need to re-calibrate the scale. 2# Check tank ''LIQUID'' hose is connected (one of three hose on the tank which is marked with -Vapor - Air purge - Liquid ) to the tank properly, make sure it is not loss or over tight. Hope this will help you to solve the problem. if so, please vote for it. wish you good luck!

Posted on Aug 03, 2010


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It is probably to warm. Are you filling it with liquid by turning the tank upsidedown.

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The machine requires a min amout of 6lbs to even charge. but if you are showing any amout charging it is not the machine its self. you are looking at may be bad hoses or couplers. it is common in the winter months to have charge issues if the unit is not above 70 degrees F. dont forget there are cars/trucks out there that no matter how hard you try you can not complete a charge on the high side and you must switch over to a low side charge

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mhkamran.jpg Please check Charging solenoid (S3) in Solenoid manifold block, it may need to change solenoid coil or Rebuild. If charging solenoid is OK, then problem can be SCALE or MAIN CIRCUIT BOARD. See if the machine display show default charging weight 90 kg/lbs when you active CHARGE mode. If not then calibrate scale. But if default charging weight is shown then replace MAIN CIRCUIT BOARD. See attached picture to find solenoids. I wish this will help you to solve the problem. If so please vote for it for further assistance. Best of luck!

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1 Answer

My 34700z will tell me i have 2 or 3 lbs of freon but when i try to charge even 1/2 it will say insuffecent. how do i reset the machine to get a true reading? thanks

Your machine sound like normal to me! For charging to the vehical you should have minimum 3.30 lbs of refrigerant on ISV tank. However if you wish to re-calibrate the scal,please check with my other solution where i post detail information about scale calibration.
I wish this will help you to solve the problem.

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Most robinair units require the filter to be changed every so many uses. If the filter is not been changed, the unit will not work.

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It sound like one of the pressure trunsducer is not working or disconnected from the manifold assy.or from ISV tank.Please check Low,High and ISV tank pressure transducer

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Please check the following: 1# Check the recovered amount of refrigerant since the last filter change(Max.filter cap.150 LBS/68 KG).If more then this you must change spin-on filter & vacuum pump oil.2# Check with vacuum gauge on compressor test(During compressor running) port & make sure it has 13"HG of suction,If suction less then 13''HG then you have to replace the compressor.3# Check all tank hose (Vaipor,Air purge & Liquid) is connected on the ISV tank quick seal.(Do not over tight).Hope this will solve your problem.

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Please do the following 1# Check your machine ISV tank liquid line quick's seems to be very tight,open little & try to charging.2# Rebuild charging solenoid.

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