Heat Controller A-DVC09SD-0, Service Manual

Page: 46 / 52

46
DVC/DVH Inverter Mini-Split Heat Controller
44
10.3.8 High Temperature Protection of Compressor Top Diagnosis and Solution (P2)
Error Code
P2
Malfunction If the sampling voltage is not 5V, the LED will display the error.
Possible Causes
●
Power Supply Problems.
●
Refrigerant Circuit leakage or blockage
●
PCB Faulty
Trouble shooting:
Check if the air flow system
of indoor and outdoor units
are obstructed?
Clear up the air inlet and outlet or the heat
exchanger of indoor and outdoor units.
Yes
No
Yes
Yes
Turn off the power supply and turn
it on 10 minutes later.
Check if the unit can
start normally.
No
Check if the refrigerant
charge volume is normal?
Recharge the correct
refrigerant volume.
Refrigerant system is blocked, such
as capillary or welded point of pipes.
Yes
Check if all the connection, especially
the connection of OLP (Over Load
Protector) sensor is good.
Correct the connection. No
Measure the resistance
between the two ports of
the OLP. Is it zero?
Yes
Replace the OLP. No
Replace the outdoor control PCB. Yes
No
Remove any obsticles blocking the
air inlets or outlets.
Recharge to the correct
refrigerant volume.
Measure the resistance
between the two terminals
of the OLP. It is zero?
Check if all the connections,
especially if the OLP (Over Load
Protector) senor is properly connected.
Check if the air flow of the
indoor and outdoor units are
obstructed?
Does the unit start
normally?
Check if the system is
properly charged.
Refrigerant circuit is blocked.
Check the capillary tubes
or welded joints of pipes.
Fix blockage or replace
blocked component.