​Generally speaking, the process of analysis and judgment can be first "outside" and then "inside". Is first to exclude external factors, such as cooling water, power, etc., after completely ruled out external factors, according to the fault phenomena, was carried out on the equipment system decomposition before judging system comprehensive analysis, can find the fault with the method of backward: first of all, according to the electrical wiring diagram to find the cause of the question of whether or not to electric system, the question of whether finally for refrigeration system, Analysis tables for some common failures are provided.

(1) Replace the contactor; 

(2) High and low temperature test chamber/constant temperature and humidity chamber exhaust pressure is too high; 

(2) There is air in the refrigeration system; 

(2) Insufficient cooling water or high temperature condenser water pipe scale is too thick; 

(2) let off air; 

(2) Increase water supply; 

(10) Clean the condenser; 

(11) High and low temperature test chamber/constant temperature and humidity chamber suction pressure is too low; 

(12) Insufficient refrigeration dose of refrigeration system; 

(13) The expansion valve is ice blocked or damaged; 

(14) Filter blockage; 

(15) Check leakage and flush fluorine; 

(16) Dry the pipe or replace the expansion valve.