Trouble Shooting - Heat Controller B-DVH09SD-0 Service Manual

DVC/DVH Inverter Mini-Split
10.3.8 High Temperature Protection of Compressor Top Diagnosis and Solution (P2)
Error Code
Malfunction
Possible Causes

Trouble shooting:

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