Hitachi YUTAKI Series - System MMI Pack

Troubleshooting
Service Manual
226
Troubleshooting of control system
SMGB0066 rev.0 - 12/2009
 
  
The Hitachi room unit has
a blank LCD screen.
Batteries not installed.
Check to see if there are batteries in the battery
coMPartment and the paper tab has been removed.
Incorrect battery orientation.
Check that the batteries have been installed in the correct
orientation.
Exhausted batteries. Replace with new batteries.
The Hitachi room unit
showsaashing
symbol on the LCD
screen.
Batteries are exhausted and need replacing. Replace with new batteries.
The Hitachi room
unitshowsaashing
symbol on the
LCD screen.
Fault in Hitachi room unit
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.
The Hitachi room unit’s
LCD display works but the
heating does not switch
on.
No power to heating system. Check that there is power to the heating system.
Program does not call for heat.
Press the
button and then press the to increase
the temperature a few degrees above the current room
temperature. The heating should come on after a few
seconds.
Wrong electrical connection. Call the installer to check the electrical connections
The red LED on the
receiver located next to
heat pump controller is
constantlyonorashing.
RF communication lost due to the wrong
location of the Hitachi room unit.
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.
RF communication fault. Call installer.
The RF Receiver does not
react to setpoint changes
on the Room Unit.
The Room Unit and RF Receiver are not
bound or the installer parameter 8:Su has
not been set correctly.
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.
After the binding
procedure the red LED
continuestoashonthe
RF Receiver.
Incorrect or incomplete binding procedure.
Incorrect position of the Room Unit during
binding.
Repeat the binding procedure.
Repeat the binding procedure keeping approx. 1m distance
between the RF Receiver and the Room Unit.
The red LED is on the RF
Receiver (Communication
loss)
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.
Re-locate the Room Unit .
Installing the System MMI Pack.
Replace batteries in the Room Unit.
 
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 button then press and hold the button for
5 seconds. The Room Unit will enter the user settings mode. Next press and hold the
and buttons together. The
following information can be viewed on the display by pressing the
or buttons:modelID,datecode(WW/YY)&
checksum.