York YHKE09XEEAMH-RX Service Manual page 47

9.2.9 High temperature protection of IPM or compress top diagnosis and solution (P2)
Error Code
Malfunction decision
conditions
Supposed causes
Trouble shooting:
For 24k,
Check if the Fastening screws
on the PCB and IPM radiator
are fixed tightly.
No
Tighten the screws and apply
Tighten the screws and apply
silicon grease.
silicon grease.
For other models,
Check if the air flow system
of indoor and outdoor units
are obstructed?
No
Turn off the power supply and turn
it on 10 minutes later.
Yes
Check if the temperature
of compressor Top
Is more than 90℃？
Yes
Check if the refrigerant
system
is normal?
Yes
Replace the outdoor control PCB.
P2
If the sampling voltage is not 5V, the LED will display the failure.
Installation mistake
●
Power supply problems.
●
System leakage or block
●
PCB faulty
●
Yes
Replace the outdoor control PCB.
Replace the outdoor control PCB.
Clear up the air inlet and outlet or the heat
Yes
exchanger of indoor and outdoor units.
Check if all the connection, especially
No the connection of OLP (Over Load
Protector) sensor is good.
Measure the resistance
between the two ports of
the OLP. Is it zero?
No
Repair the refrigerant
system .
45
Yes
No
Yes Replace the outdoor control PCB.
No Correct the connection.
Replace the OLP.