Air conditioning pressure switch bad how to check?
Experience Summary: In the maintenance of multi-observation control panel display fault code, you can quickly find the cause of the malfunction.
Heating Cream: "Heating" lights flashing
Anti-freeze protection: "run" and "cool"
Anti-cold wind protection: "Run" flashes
Overcurrent protection: "Run" and "29" flashing Low voltage protection: "Run" and "18" flashing
Phase sequence protection: "run" and "timed"
Communication failure: "run" flash, the rest off
Sensor failure: The "temperature" lamp flashes
Analysis of the reasons: home inspection, test machine cooling less than a minute, the control panel "running" lights and "18" degree lights flashing, according to the display to determine the protection problem, height measurement, low pressure switch normal, compressor exhaust temperature detection normal , Then lift the compressor overcurrent detection, test machine failure, replace the outdoor test board, test machine failure, such as the old, re-test machine, carefully observe the work of outdoor unit, when the cooling about a minute or so, hear low-voltage switch off Of the sound, then the outdoor unit to stop working, when the short-term low-voltage protection test machine, the normal operation, measured its low pressure is normal, to determine the pressure switch is poor quality, malfunction. Solution: Replace the low voltage switch, test machine all normal.
Symptom: air conditioning is not cooling
There are two types of air-pressure switch, one is low-voltage protection, one is high-pressure protection, the approximate principle is: when the system refrigerant pressure rise when set pressure, the pressure switch automatically open, the system stops working The system pressure is reduced to the set pressure when the pressure switch automatically connected to the system to work properly, air conditioning pressure switch is to detect the pressure of air conditioning pipelines, and then the pressure signal to the air conditioning control system, play a role in protecting air conditioning compressors and pipelines The Only the pressure signal in the normal range, air conditioning can work properly!
