Pe Malfunction: Evaporator T2 High Temperature Protection - Midea Mini VRF Technical & Service Manual

MCAC-VTSM-2016-02

4.15 PE malfunction: Evaporator T2 high temperature protection

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
Evaporator T2 high temperature protection
Check whether average temperature of evaporator is
higher than 63 degrees for 50 seconds or not.
Check whether the resistance of evaporator
temperature sensor is correct.
Replace outdoor main PCB.
Clean heat exchanger
Remove the refrigerant pipe and then
use high pressure nitrogen or refrigerant
to blow the pipe. Vacuums the pipe then
add the refrigerant again.
Troubleshooting
NO
NO
YES
YES
Stop unit.
YES
Judge 2: whether the heat exchanger needs cleaning.
YES
R410A All DC Inverter Mini VRF
YES
Replace temperature sensor.
Judge 1: if indoor temperature is too high or not(exceeds the
using range of the unit.)
Judge 3: whether the refrigerant pipe is blocked.
Replace outdoor main PCB.
NO
NO
NO
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