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Posted on Jan 02, 2017
According to http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CDMQFjAB&url=http%3A%2F%2Fwww.aircommand.com.au%2Fdocs%2FIbisTechManual.pdf&ei=29JPVfO8NYu9sAWE_YGQAg&usg=AFQjCNEPb_nNaXQsRrD2ZphXVLpRYwECGQ&sig2=cHErjmhdOfyCsep25gpmfw
E4: Indicates lack of refrigerant, or the compressor is not running, or the thermistor is out of calibration. Action: Check that the compressor is running by listening. If it is apparent that the compressor is running, then check the temperature difference across the evaporator. i.e. Measure temperature of return air at inlet filters and measure temp. of discharge air at grilles. This temp diff. should be 14 to 18 C. with fan on hi speed. If temp diff. is less than this, suspect lack of refrigerant. Fit a suction gauge to access valve at rear of unit. See fig 12. On a 35C outside temp. then suction should be 380 to 450Kpa.
Action (continued) If the temp. differential is 14C or more but unit goes out on E4 after approx. 30 minutes, please check the actual thermistor temperature by the following procedure. With the inside fan running on Hi. Press Temp down button followed by the mode button. Hold them both in for approx 5 seconds. The amber Lock LED illuminates. Now press the Temp down button and the Sleep button Together for about 1 second. The green Med speed will be Flashing. The display is now reading the temp of the outside coil. Now press the Temp up button once. The Green Hi speed will be flashing. The display is now reading the temp. of the inside coil. This temp will usually be from 5 to 12 C. If it is above 24C. It is another indication of lack of refigerant. If on the other hand the air on /air off differential is 14C or greater then suspect the thermistor itself to be out of calibration. Check the thermistor as per an E1,E2 or E3 failure by measuring its resistance. See fig 19 and referring to table 1.
Posted on May 10, 2015
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