Mitsubishi Electric City Multi PURY-EM200YNW-A1, Service Handbook

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[6-4 The Following Symptoms Are Normal ]
4 -
chapter 6 BS_06_F2
6 Tes
t Ru
n
6-4 The Following Symptoms Are Normal
Symptoms
Remote controller
display
Cause
The auto vane adjusts its posi-
tion by itself.
Normal display
After an hour of cooling operation with the auto vane in the vertical posi-
tion, the vane may automatically move into the horizontal position.
Louver blades will automatically move into the horizontal position while
the unit is in the defrost mode, pre-heating stand-by mode, or when the
thermostat triggers unit off.
The fan speed changes
during heating.
Normal display
Very Low fan speed when "Thermo-OFF.' Changes from Very Low to pre-
set fan speed when "Thermo-ON" depending on pipe temperature.
The fan stops during heating
operation.
Defrost
The fan remains stopped during defrost operation.
The fan keeps running after
the unit has stopped.
Unlit
When the auxiliary heater is turned on, the fan operates for one minute
after stopping to dissipate heat.
The fan speed does not reach
the set speed when operation
switch is turned on.
STAND BY
The fan operates at extra low speed for 5 minutes after it is turned on or
until the pipe temperature reaches 35°C[95°F], then it operates at low
speed for 2 minutes, and finally it operates at the set speed.
(Pre-heating stand-by)
When the main power is
turned on, the display shown
on the right appears on the in-
door unit remote controller for
5 minutes.
"HO" or "PLEASE
WAIT" icons blink
on the display.
The system is starting up. Wait until the blinking display of "HO" or
"PLEASE WAIT" go off.
The drain pump keeps run-
ning after the unit has
stopped.
Unlit
The drain pump stays in operation for three minutes after the unit in the
cooling mode is stopped.
The drain pump is running
while the unit is stopped.
Unlit
When drain water is detected, the drain pump goes into operation even
while the unit is stopped.
HBCs may make noise during
cooling/heating changeover.
Normal display
This noise is made when the water circuit is reversed and is normal.
The sound of water flow is
sometimes heard from the in-
door unit immediately after the
unit went into operation.
Normal display
This noise is caused by transient instability of water flow and is normal.
The check valve clacks.
Normal display
When the refrigerant flow is small, the valve vibrates and clacks. This is
not a malfunction.
In a short while after the out-
door unit stops, the unit
makes a clicking sound.
No display
After the unit stops and before the unit performs pressure equalization,
the pressure difference temporarily becomes small and the check valve
may vibrate and make a sound. This is temporary and does not imply a
problem.
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