Century COMFORT-AIRE VMH-SG Series Service Manual page 106

TS11-S-INV: Top temperature protection of compressor or High temperature protection of
IPM module or High pressure protection diagnosis and solution
Description: For some models with overload protection, If the sampling voltage is not 5V, the LED will display the failure.
If the temperature of IPM module is higher than a certain value, the LED displays the failure code.
For some models with high pressure switch, outdoor pressure switch cut off the system because high pressure is higher
than 4.4 MPa, the LED displays the failure code.
Recommended parts to prepare:
• Connection wires
• Outdoor PCB
• IPM module board
• High pressure protector
• System blockages
Troubleshooting and repair:
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.
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric
control box should be replaced as a whole.
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
between the two ports of
the OLP. Is it zero?
No
Repair the refrigerant
system .
 Troubleshooting
Troubleshooting
No
Yes
the resistance
No
Yes Replace the outdoor control PCB.

Service Manual - VMHxxSG
Correct the connection.
Replace the OLP.