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6) Trouble Shooting
6.1 Trouble Shooting Guide
Symptom (Fault
Message)
The room thermostat
displays the
symbol but
the relay box relay does not
switch on.
The relay 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 relay
box.
The red LED on the
relay box is illuminated
(Communication loss)
6.2 Diagnostic Mode
The CM727/721 room thermostat has a user accessible mode that provides information useful to a remote
service person and a means of checking whether the boiler is working. To access this press the OFF
button, then press and hold the
mode. Next press and hold the
5 minutes and the following information can be viewed on the display by pressing the
model ID, date code (WW/YY) & checksum.
Installation Guide
Possible Cause
This is normal operation. The relay box cycles
the relay on and off for times proportional to
the demand signal (0-100%) from the room
thermostat. The
symbol only indicates that the
demand value is greater than 0%.
The room thermostat and relay box are not
bound.
Incorrect or incomplete binding procedure.
Incorrect position of the room thermostat during
binding.
The relay 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.
button for 5 seconds. The room thermostat will enter the user settings
and
buttons together. The room thermostat will hold the relay on for
Remedy
Using the
button change the
temperature setpoint 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 section 5)
Additional Installation Information.
Repeat the binding procedure.
Repeat the binding procedure keeping
approx. 1 m distance between the relay
box and the room thermostat.
Re-locate the room thermostat following
instructions in section 2) Installing the
CM700 Wireless System.
Replace batteries in the room thermostat.
or
button. :
11
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