Mitsubishi Lossnay LGH-150RVXT-E Handbook page 16

Individual function check items
If Lossnay does not work in the trial operation after installation is completed, or if Lossnay stops working dur-
ing use, check the following items.
No. Problem
1 The fan does not
operate even
though the trial
operation switch
(SW2-1) on the cir-
cuit board is turned
ON.
2 Though the remote
controller display
indicates the fan
is running, the fan
stops by itself.
Factor
The connector between the fan
motor and circuit board is discon-
nected.
The connector between the con-
trol circuit board and power circuit
board is disconnected.
The wiring for the reactors is
incorrect.
The jumper is not connected to
TAB3 and TAB4.
The model selection switch (SW6)
is not set correctly.
The temperature around the prod-
uct is high.
Fan motor failure
Circuit board failure
The Lossnay unit is operating in
the protective mode (intermittent
operation).
The Lossnay unit is set to the
delay operation.
The interlocked air conditioner
(Mr. Slim indoor unit or City Multi
indoor unit) is defrosting.
The system is switching the venti-
lation mode.
The temperature around the prod-
uct is high.
Check the connector (CN9) for the exhaust fan
motor and the connector (CN10) for the supply
fan motor.
Check the connector connections (CN18-CN118,
CN19-CN119, and CN21-CN121).
Check the wiring for the reactors.
Connect the jumper to TAB3 and TAB4.
Make the SW6 setting appropriate for the model.
(See chapter 7. (11) Setting status record (page 51).)
Use the product at a temperature of 40°C or
lower.
Check the resistance between the motor leads.
(See chapter 6. (7) Motor resistance table (page 34).)
If the measured value is significantly different
from the values specified in the table, replace
the motor.
Disconnect the connectors (CN9 and CN10),
and check the output voltage of each pin of the
connectors within one minute after turning the
switch (SW2-1) ON. (One minute later, the error
will occur.)
(See chapter 5. (2) Power circuit board (page 9).)
If the voltage value is abnormal, replace the
circuit board.
If the problem persists, replace the motor.
When PZ-61DR-E is used, it displays the icon
" " that indicates the protective operation is in-
progress. For details, see the Lossnay technical
manual or remote controller manual.
When PZ-61DR-E is used, it displays the icon
" " that indicates the delay operation is in-
progress.
LED1 (green) on the control circuit board lights.
Lossnay operates in 30 minutes (or 15 minutes)
after the air conditioner is operated to run.
Check the function selection switch (SW5-1) on
the circuit board or the function setting (No. 9) of
PZ-61DR-E. (See the Lossnay technical manual.)
The supply fan has been stopped to prevent
cold air from blowing out. When the air condi-
tioner finishes defrosting, the fan operation is
started automatically.
When switching the ventilation mode (Energy
recovery mode/Bypass mode), the fan stops (for
approx. 30 seconds).
When the ambient temperature of the product
is high (higher than 40°C), the fan may stop to
prevent the fan motor from overheating.
─ 16 ─
Corrective action