Trouble Shooting; Trouble Shooting Guide - Hitachi ATW-RTU-01 Installation And Operation Manual

Installation and Operation Manual
12

5. Trouble Shooting

5.1 Trouble Shooting Guide

Symptom (Fault Message)
The room thermostat
displays the symbol but
the receiver box relay does
not switch on.
The receiver box does not
react to setpoint changes
on the room thermostat.
After the binding procedure
the red LED is on and the
green one is flashing once
every 3 sec on the receiver
box.
The red LED is on the
receiver box
(Communication loss)
Possible Cause
This is normal operation. The receiver
box cycles the relay on and off for times
proportional to the demand signal (0-100%)
from the room thermostat. The
only indicates that the demand value is
greater than 0%.
The room thermostat and receiver box are
not bound.
Incorrect or incomplete binding procedure.
Incorrect position of the room thermostat
during binding.
The receiver box receives no RF messages
from the room thermostat:
RF signal is blocked due to wrong location
of the room thermostat.
Room thermostat batteries are exhausted.
Remedy
Using the
temperature setpoint by a few degrees. The
receiver box should switch the relay on after
a few seconds delay.
symbol
Reset the receiver box 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. 1 m distance between the
receiver
box and the room thermostat.
Re-locate the room thermostat following
instructions in section 2) Installing the
programmable thermostat.
Replace batteries in the room
thermostat.
button change the