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Troubleshooting
Comfort II– 6720810965 (2014/07)
7Troubleshooting
7.1 Temperature related faults
7.2 Programmable Room thermostat and Receiver related faults
7.2.1 Programmable Room thermostat
Faults will be display alternating between the fault code and the cause code.
7.2.2 Receiver
If the LED is flashing at one flash per second then the Receiver has detected a fault.
Problem Cause Remedy
The required room
temperature has not been
achieved.
Airlock Bleed the radiators and vent the heating system.
Low system pressure Top up the system pressure via the filling link
Time program Is the heating on for long enough
Flow temperature Set a higher flow temperature
Thermostat valve in reference room Operate the TRV to ensure that it does not stick
Fully open the TRV
The room temperature is higher
that the set value
Check the Room thermostat location
refer to section 3.2
Move the Room thermostat to a more suitable location
Fault
code
Cause
code Problem Description Remedy
A21 1001 No RF signal All units powered and not showing low
battery symbol
Check signal strength and reposition
Room thermostat for better signal
A22 1002 No RF signal or pairing
fault
All units powered and not showing low
battery symbol
Repeat pairing
A23 1003 Room stat internal sensor
failure
Internal room temperature sensor out of
valid range
Replace RF Room thermostat
A24 1004 Remote RF unit has a fault Another room thermostat in the system has a
problem
Check other room thermostats within
the system for fault codes
A27 1007 Unable to communicate
with boiler’s EMS bus
Boiler is EMS compatible but no
communication
Replace EMS interface
A28 1008 Not paired Unit is not paired Unpair and pair all
Blank display or low battery symbol Batteries are spent Replace batteries
Fault Problem Description Remedy
Possible
fault
condition
Flashing
1 flash per second
(1 Hertz)
Local programmer error.
Not a boiler fault, possibly no RF connection with the
Programmable room thermostat(s), at least one connection
has been lost
Check the Programmable Room
thermostats for fault code.
17


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