Mark HCNI 533, Техническое руководство

Страница: 71 / 84

71
EN
8.5.13 PC 03 (Low pressure protection)
Description: Outdoor pressure switch cuts off the system because low pressure is lower than 0.13
MPa, the LED displays the failure code.
Recommended parts to prepare or to check:
• Connection wires
• Outdoor PCB
• Low pressure protector
• Refrigerant
Troubleshooting and repair:
“Wall” Type Active Line R32 Refrigerant AC: 6. Troubleshooting
[6]-34
Troubleshooting and repair:
YES
YES
NO
NO
YES
YES
Replace low pressure protector.
Stop the unit.
Low pressure protection.
Are the low pressure protector
and main control board wired
correctly?
Reconnect the low pressure pro-
tector and main control board.
Is the low pressure
protector broken?
NO
NO
Method: Disconnect the plug.
Measure the resistance of the
low pressure protector, if the
protector is normal the value is
0. Does a problem still exist?
Is the outdoor ambient tempera-
ture too low?
Is the valve core of the high
pressure valve fully opened?
Open the valve core of the
high pressure valve.
Is the indoor fan running properly
in cooling mode?
NO
Please refer to the solution of the
“Fan speed is operating outside of
normal range” malfunction.
YES
Replace outdoor main board.
Does a problem still exist?
NO
NO
Check whether the refrigerant
system is functioning properly.
When the level of refrigerant is not
sufficient, does the system func-
tion properly after more refrigerant
is added?