Alfa Laval Micro Instructions D'installation, D'entretien Et D'utilisation page 46

Alfa Laval Micro
Installation, service and operating instruction
14 Troubleshooting the CM721
Symptom
Blank Display No power to the thermostat.
Display shows flashing The batteries in the thermostat
symbol are low on power.
A fault has occurred in your
heating system.
Display shows
symbol.
Display shows the The installer has set a scheduled
word 'SERVICE' maintenance alert period on your
CM721 as a recommendation
that your heating system should
receive a routine inspection.
Relay Box (BDR91) The relay box receives no RF
red LED is constantly messages from the room
on or flashing thermostat:
RF signal is blocked due to
wrong location of the room
thermostat.
Room thermostat batteries are
exhausted.
The room thermostat This is normal operation. The
relay box cycles the relay on and
displays the symbol
off for times proportional to the
but the relay box relay
demand signal (0-100%) from the
does not switch on
room thermostat. The
only indicates that the demand
value is greater than 0%.
The relay box does not The room thermostat and relay
react to set point box are not bound.
changes on the room
thermostat.
After the binding Incorrect or incomplete binding
procedure the red LED procedure.
is on and the green
Incorrect position of the room
one is flashing once
thermostat during binding.
every 3 sec on the
relay box
All manuals and user guides at all-guides.com
symbol
44
Remedy
Check batteries are installed by
removing the battery cover.
Check batteries have been installed in
the correct orientation.
Replace the batteries.
Replace the batteries.
Remove and re-insert the batteries.
If the symbol does not clear
after a few minutes contact Alfa Laval.
Call your installer to arrange a
maintenance visit.
Note: The CM721 and heating system
will continue to operate as normal.
Re-locate the room thermostat following
instructions in section 6 Installing the
CM721 wireless system.
Replace batteries in the room
thermostat.
NOTE: The boiler can be controlled
manually when the RF communication
is lost: Press the BDR91 push button to
switch the boiler on and off. When the
green LED is on – the boiler is on.
Using the button change the
temperature set point by a few degrees.
The relay box should switch the relay on
after a few seconds delay.
Reset the relay box by pressing and
holding the push button for 15 seconds.
Then follow the binding / rebinding
procedure as described in chapter
Binding/rebinding the CM721.
Repeat the binding procedure.
Repeat the binding procedure keeping
approx. 1 m distance between the relay
box and the room thermostat.
7