Mars DVH Series - Page 48

Service Manual - DVH 09/12/18/24 SF Series
Service Manual - DVH 09/12/18/24 SF Series
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9.3.9 High temperature protection of IPM module or compressor top diagnosis and solution (P2)
Error Code
P2
Malfunction conditions
If the sampling voltage is not 5V, the LED will display the failure.
Possible causes
● Installation error
● Power supply problems.
● System leakage or blockage
● PCB faulty
Troubleshooting:
For 18K, 24K
Yes
No
Check if the Fastening screws
on the PCB and IPM radiator
are fixed tightly.
For other models,
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 temperature
of compressor top
is more than 194°F?
No
Check if the refrigerant
system
is normal?
Repair the refrigerant
system .
Replace the outdoor control PCB.
Yes
Check if all the connections,
especially the connection of OLP
(Over Load Protector) sensor is good.
Correct the connections. 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
Tighten the screws and apply
silicon grease.
Replace the outdoor control PCB.