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Worcester-Bosch Greenstar Comfort I RF - 2023 Manual

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Fault finding and resolution
Comfort I – 6720810964 (2017/02)
7 Fault finding and resolution
7.1 Fault table
If a fault code is displayed the user must first press the knob to return to the main display.
The last 5 control faults can be viewed in the Faults history (refer to 5.2.2 Maintenance).
Fault
code Problem Description Resolution
The temperature
displayed on the
thermostat unit is
different than the room
temperature
Temperature offset setting is other than
0
Check the temperature offset setting on the
thermostat (E1 menu, see section 6.3 page 15)
and adjust as required.
Room to room temperature difference Consider possible differences between rooms due
to local draught, exposure to sunshine etc. Move
the Room thermostat to a more suitable location if
necessary.
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 / weather change 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 than the set value
The Room thermostat is subject to
draught or energy loss
Move the Room thermostat to a more suitable
location (refer to section 3.3).
No flame symbol visible on
the Room thermostat
The actual temperature is close to the
target temperature. The control turns the
boiler off early in order to prevent
overshoot.
Set the target temperature is at least 2 ºC above
the current displayed temperature. It takes up to 6
minutes for the flame to come on.
The flame symbol is not available with oil fired boiler controls.
A21/
A22
Loss of RF signal The room thermostat unit is incorrectly
positioned
Check signal strength and reposition
Room thermostat for better signal.
Wire the receiver out on a wall plate if the boiler is
installed in a loft or garage.
Receiver or Room thermostat unit has no
power supply
Check that boiler has power and that Room
thermostat batteries are not running low (see
Blank display or low battery symbol).
A21 will be displayed at initial
switch on until the two units have
established an RF communication link
Allow up to 1 minute after power up for the units to
communicate.
A23 Room stat internal sensor
failure
Internal room temperature sensor out of
valid range
Replace RF Room thermostat.
A24 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 Unable to communicate
with boiler's EMS bus
Boiler is EMS compatible but no
communication
Replace the Programmer/Receiver unit.
A28 Not paired Unit is not paired Unpair and pair all (see section 7.2).
Blank display or low
battery symbol
Batteries are depleted Replace batteries and check/clean battery
contacts.
… 16 …


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