1. There is no power applied
2. The UCM Firmware programming cable is connected to PP1. This cable should be
connected between UCM05 and PP1 only for firmware upgrade operation. The cable can
be left connected to PP1 in normal operation only if it is not connected to the UCM at
the same time.
3. The 12V supply is shorted by external devices or wiring and heatsink is hot (see next
item)
System does not work, and Heatsink is very hot
This is probably due to a short on one of the wires connected to the system or an external
device drawing too much current, causing the power supply to shut down to protect itself.
Unplug all the terminal blocks from inputs, outputs. 12V auxiliary out, keypads and other
terminals. It may be necessary to switch off and leave the power off for several minutes to
allow the resettable fuses to cool down and reset. Check the correct sequence of red and
green leds as described above when the power is switched on Then connect one keypad and
other devices one by one. This will help discover the cause of the short or excessive current
Communications Failure
The keypad Home LED blinks and “Communication Failure,
ID
“ followed by the ID number
is reported upon user sign-in. This means that a slave device, ie Keypad, Door Station,
SEM, UCM, or RIO/SCS is not communicating with the Comfort panel. The ID address of the
device which is not communicating is reported. This ID identifies which device is giving the
problem, according to the table below”
88
8
72
8
87
7
71
7
86
6
70
6
85
5
69
5
84
4
68
4
83
3
67
3
82
2
66
2
81
1
65
1
ID
RIO/SCS
ID
Keypad
51
3
24
8
50
2
23
7
49
1
22
6
ID
Door Station
21
5
20
4
35
3
19
3
34
2
18
2
33
1
Not Reported
1
ID
SEM (Slave)
ID
UCM
The name of device causing the communications failure is displayed on the KP04 LCD
keypad
1
Check the wiring to the unit concerned.
2
If Communications Failure happens each time on Security Off, the power to the device
may have been connected to S12V. Power to the devices should be connected to 12V
terminals, except in the case of SEM01 which have their own power supply.
3
The problem could also be due to one of the devices on the RS485 bus (eg SEM,
Keypad, Door Station, UCM) putting a fault on the bus. Remove each device from the
KA/KB line and see if the communications failure problem disappears.
Comfort II Supplementary Installation Manual
14
