Operating Instructions and Installation Guide
Wall Mounted Split System
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Page 17
2.0 Trouble Shooting
E4 Troubleshooting Questionnaire
1) When does the E4 error code appear? Is it immediately after the air conditioner is turned on or does it
appear after some operation? If so how many minutes from start-up to the error code appearing?
3) Check the outdoor unit. Is the compressor working? Is the fan working?
1) Are the four valves where the copper tubing connects to the outdoor unit fully opened?
2) Were the 2 copper pipes between the indoor and outdoor un its evacuated during installation?
3) Were the 2 copper pipes between the solar collector and o utdoor unit evacuated during installation?
4) Have all of the copper pipes been connected properly? Have they been leak tested? Is there any
kinking or folding?
5) Is the copper piping standard length or extended?
7) What is the refrigerant pressure when returned to the compressor? Should be between 140 -160 PSI.
When measuring the pressure, what the is the behaviour of the needle on the gauge? Is it steady, slight
movement, erratic movement?
Are there other appliances on the same circuit
causing a load problem?
9) Is the thermostat pushed hard into the radiator core of the indoor unit? Check by lifting the grill and
Questions if the system has been operating normally before the E4 error
code has appeared:
Questions if the system has just been installed and the E4 error code has
appeared:
2) Check the indoor unit. Is there airflow coming from the indoor unit? If so is the airflow cold?
6) Is there sufficient ventilation around the indoor and outdoor units?
8) Is the electrical supply to the unit stable and sufficient?
Push the thermostat hard into the radiator
core.
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