MCAC-VTSM-2013-12 R410a Full DC Inverter Mini VRF
Troubleshooting 121
7.15 PE/P7 malfunction: Evaporator T2 high temperature protection
(PE is for 8/105/180 model, P7 is for 120~160 model)
When the middle average temperature of the evaporator is higher than 63 degrees for 50 seconds, the
unit will stop operating. When pipe temperature is lower than 50 degrees, the unit will resume running.
LED displays PE/P7
Evaporator T2 high temperature protection
Check whether average temperature of evaporator is
higher than 63 degrees for 50 seconds or not.
NO
Check whether the resistance of evaporator
temperature sensor is correct.
YES
Replace outdoor main PCB.
NO
Replace temperature sensor.
YES
If indoor temperature is too high or not(exceeds the using
range of the unit.)
Replace outdoor main PCB.
NO
Whether the heat exchanger needs cleaning.
Clean the heat exchanger
NO
Whether the refrigerant pipe is blocked.
Clean heat exchanger
YES
YES
Remove the refrigerant pipe and then
use high pressure nitrogen or refrigerant
to blow the pipe. Vacuums the pipe then
add the refrigerant again.
YES
Stop unit.
NO
