System Mmi Pack - Hitachi YUTAKI Series Service Manual

7.5.2. System MMI Pack

Symptom
The Hitachi room unit has
a blank LCD screen.
The Hitachi room unit
shows a flashing
symbol on the LCD
screen.
The Hitachi room
unit shows a flashing
symbol on the
LCD screen.
The Hitachi room unit's
LCD display works but the
heating does not switch
on.
The red LED on the
receiver located next to
heat pump controller is
constantly on or flashing.
The RF Receiver does not
react to setpoint changes
on the Room Unit.
After the binding
procedure the red LED
continues to flash on the
RF Receiver.
The red LED is on the RF
Receiver (Communication
loss)
• diagnostic mode
The Room Unit has a user accessible mode that provides information useful to a remote service person and a means of
checking whether the heating system is working. To access this press the
5 seconds. The Room Unit will enter the user settings mode. Next press and hold the
following information can be viewed on the display by pressing the
checksum.
SMGB0066 rev.0 - 12/2009
226
Troubleshooting of control system
Possible cause
Batteries not installed.
Incorrect battery orientation.
Exhausted batteries.
Batteries are exhausted and need replacing.
Fault in Hitachi room unit
No power to heating system.
Program does not call for heat.
Wrong electrical connection.
RF communication lost due to the wrong
location of the Hitachi room unit.
RF communication fault.
The Room Unit and RF Receiver are not
bound or the installer parameter 8:Su has
not been set correctly.
Incorrect or incomplete binding procedure.
Incorrect position of the Room Unit during
binding.
The RF Receiver receives no RF messages
from the Room Unit:
RF signal is blocked due to wrong location
of the Room Unit.
Room Unit batteries are exhausted.
remedy
Check to see if there are batteries in the battery
coMPartment and the paper tab has been removed.
Check that the batteries have been installed in the correct
orientation.
Replace with new batteries.
Replace with new batteries.
Remove and re-insert the batteries in the Hitachi room unit.
If the symbol does not clear itself in a few minutes
call the installer.
Check that there is power to the heating system.
Press the button and then press the
the temperature a few degrees above the current room
temperature. The heating should come on after a few
seconds.
Call the installer to check the electrical connections
Hook the Hitachi room unit back on the wall bracket or replace
the Hitachi room unit on the table stand in the position where
RF communication was reliable.
Call installer.
Make sure that the 8:Su parameter value is set correctly.
Reset the RF Receiver by pressing and holding the push
button for 15 seconds. Then follow the binding / rebinding
procedure as described in section 4. Binding / Rebinding
Procedure.
Repeat the binding procedure.
Repeat the binding procedure keeping approx. 1m distance
between the RF Receiver and the Room Unit.
Re-locate the Room Unit .
Installing the System MMI Pack.
Replace batteries in the Room Unit.
button then press and hold the
and
or buttons : model ID, date code (WW/YY) &
Troubleshooting
Service Manual
to increase
button for
buttons together. The