Hitachi ATW-RTU-08 Manuel D'installation Et De Fonctionnement page 18

Fail-Safe Mode Setup
5 FAIL-SAFE MODE SETUP
The fail-safe mode defines the system status if the RF communication is lost (e.g. when the Room thermostat stops communicating
due to discharged batteries).
The system will continue to operate at the last communicated setpoint.
6 TROUBLESHOOTING
Symptom (Fault Message)
The receiver box does not
react to setpoint changes on
the room thermostat.
The LED shows alarm
8 PMML0582 rev.1 - 12/2021
Possible Cause
The room thermostat and receiver box are
not bound.
There is no communication between
YUTAKI Unit and RF receiver.
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.
Faulty receiver.
Remedy
Reset the receiver box by pressing and holding the push button
for 15 seconds. Then follow the binding / rebinding procedure as
described in section "3 Binding the Wireless thermostat and RF
Receiver".
Check H-LINK connection wire between YUTAKI Unit and RF
receiver and replace it if necessary.
Re-locate the room thermostat.
Replace batteries in the room thermostat.
Change the receiver.