The Following Symptoms Are Normal - Mitsubishi Electric PURY-M200YNW-A1 Service Handbook

[6-4 The Following Symptoms Are Normal ]

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