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Explanation of
error
Cause: In standby state or when the equipment is running, the
high-voltage switch is disconnected three times (within 20 minutes)
and reported as "high-voltage switch protection";
Inspection path: high-voltage switch cable
→
connector
→
high-voltage switch
→
main control panel
Tools required
for inspection
Multimeter, connectoin line and high-voltage swtich
Frequent
problematic part
High-voltage swtich connectoin line, fluorine deficiency of unit and
high-voltage swtich
Inspection
procedure and
key points
1.
Check whether the plug-in terminals are firmly connected and
whether the terminals and the main control panel are welded loosely. If
necessary, gently pull them to check;
2.
Use a multimeter to measure whether it is disconnected;
3.
Use the multimeter to check the state of the high-voltage swtich and
check whether it is in the OFF state (normally OFF, unusual
disconnection);
4.
If the pressure is normal and the high-voltage switch is kept open, it
is positive that the pressure voltage is faulted;
5.
If the pressure switch is normal and the connection line is tact and
the failure is still reported, replace the corresponding main control
panel.
Special attention
The reason why high-voltage switches are often disconnected is the
leakage of equipment. When the high voltage switch is off, first check
whether the air conditioner's pressure is normal. If it is normal but the
failure is still displayed aftere replacing the external main control
panel, it is possible that the connecting pipe may be too long or the
external ambinet temperature is too low
