Toyotomi MTN-MTG 256DV Service Manual page 35

10.2.4 E5(Open or short circuit of outdoor temperature sensor) diagnosis and solution.
Is the outdoor temperature
sensor connector and
connection good?
YES
Replace the sensor and
check if E5 display again?
10.2.5 E6(open or short circuit of room or evaporator temperature sensor) diagnosis and solution.
Is the indoor temperature
and evaporator sensor
connector and connection
good?
YES
Replace the sensor and
check if E6 display again?
10.2.6 E7(outdoor fan speed out of control) diagnosis and solution
Is the outdoor fan motor
connector and connection
good?
YES
Is voltage being applied
to the fan motor right?
NO
10.2.7 P0(Inverter module or IGBT over-strong current protection) diagnosis and solution.
Is all connections on PCB
and between PCB and
compressor good?
YES
Replace the outdoor PCB
and then repower on. Is
the failure cleared?
NO
Repair the connector and
reconnect
YES
Replace outdoor e-box
NO
Repair the connector and
reconnect
YES
Replace the.indoor PCB
NO
YES
NO
Repair or correct the
connector or connection.
NO
Check the compressor
Repair the connector and
reconnect
Outdoor PCB is defective.
Replace the outdoor PCB.
Replace the outdoor fan
motor
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