How to solve the air-conditioner special failure

in the maintenance of air-conditioner, many fault is a recurring, lead to customer feeling very upset. So like this problem that how to solve? In living example, the ice wall is a kind of such common fault. Let the cooler price combined with examples, to tell you to solve this fault tips. There are many teachers in the maintenance of air-conditioner will meet ice wall. Ice block after treatment scheme also has a lot of, there will be someone there to add methanol, so the ice wall is not very serious can be resolved, but legacy will be a lot of such as compressor leakage; Accelerating tube wall decay compressor oil metamorphism dirty plugging after long time is serious consequences such as machine scrap. 1: open system should pay attention to in the first turn on the air-conditioner things out to make the machine temperature and room temperature. 2: long time open compressor of two low pressure to seal the mouth to avoid air to enter. Down as far as possible don't in the humid environment ( With water on rainy days, house, kitchen and hotel and so on are not easy to crack down on) 。 3: as for the row operation no faith can also be connected to the vacuum pump after the row empty again. 4: and if lack of refrigerant R12 machine can be used to quickly cut rushed not can use the knife cut open after rapid welding into table cut can directly add refrigerant without vacuum. Because after welding table of residual stress is higher than the closed cutting system, the machine of refrigerant gas or gasification conditions so I don't have to be in a vacuum. Hung up the pressure connection line 5: to have order by low pressure tube finally answer the capillary ( A new filter drier) best With its first press the row ( Conditional with nitrogen blow down, under no conditions using a refrigerant) Since the row after the sealed capillary access filter drier, add refrigerant commissioning so little ice wall. If it is blocked, you can use a closed thermostat custom 5 minute start-up and shut-down. Let the unattended machine working day can solve ( If the wall quickly at the start of the artificial control of 10 seconds will stop this back and forth several times in the closed thermostat) , if not yet in the replacement of a filter drier repeat the above method ( Replace filter must be careful not to use welding torch welding, because 600 burning flammable R12 toxic in welding down you will open the charging table so it is easy to force air into the system caused by secondary frost) , after must be separated with cutter filter drier, direct from the rows to exclude refrigerant and water system net directly welded into the filter drier after sealing. The processing of add refrigerant commissioning, I believe that will work normally not in the ice block.