51
(20) P2 - High-pressure protection
Cause: In standby state or when the equipment is running, the
High-pressure switch is disconnected three times (within 20 minutes)
and reported as "High-pressure protection";
Inspection path: High-pressure switch cable → connector →
High-pressure switch → main PCB
Tools required
for inspection
Multimeter, connectoin line and High-pressure swtich
Frequent
problematic part
High-pressure swtich connectoin line, fluorine deficiency of unit and
High-pressure swtich
Inspection
procedure and
key points
1. Check whether the plug-in terminals are firmly connected and
whether the terminals and the main PCB 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-pressure swtich
and check whether it is in the OFF state (normally OFF, unusual
disconnection);
4. If the pressure is normal and the High-pressure 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 PCB.
The reason why High-pressure 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 Outdoor Unit main PCB,
it is possible that the connecting pipe may be too long or the Outdoor
Unit ambinet temperature is too low
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