Salus RT500BC Instruction Manual page 22

Once in Temporary Override mode, the
clock and day are displayed, along with the
SET indicator; all other indicators are cleared
from the display. The set point temperature
will flash to indicate that it can be changed:
The set point temperature can be adjusted
within 5 °C to 35 °C.
Temporary Override mode remains active until the new set point settings
are adjusted, Frost Protection is activated or the next programme time /
temperature set point is reached.
On/Off Control
When the RT500 is operating in NORMAL mode, if the Boiler Control has not
received a signal from the RT500 after 1 hour, the Boiler Control will turn off
the boiler, and the LED indicator will flash constantly (two times every
second).
Once the Boiler Control receives a valid ON or OFF signal, the Boiler Control
will control the heating system accordingly.
22 RT500BC INSTRUCTION MANUAL