Bedienungsanleitung Worcester-Bosch Greenstar Comfort I RF

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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

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.

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