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Maintenance
Greenstar Heatslave II 2022+ – 6 721 843 979 (2022/01)
4.3 Fault finding
4.4 System gassing
Problem Cause Remedy
Boiler stops working, blue light and
warning triangle flashing and fault
code displayed
Internal error Press the Reset button and the boiler should
restart, if not call Worcester, Bosch Group,
quoting fault codes
Boiler stops with no fault codes Possible overheat Wait 30 minutes for boiler to cool
Boiler stops working, blue light and
warning triangle flashing and fault
codes 9F 855 are displayed
Burner lockout Press the Reset button to restart the burner.
If the burner fails to fire and fault 9F 855 is
displayed again, check the oil level in the tank
Fault codes 9F 856 More than 4 attempts at a reset
during Burner lockout fault 9F 855,
no more reset attempts can be made.
Call Worcester, Bosch Group, quoting fault codes
Desired room temperature is not
reached
Thermostatic radiator valve(s) set
too low
Increase thermostatic radiator valve setting(s)
Room thermostat set too low Increase room thermostat setting
Temperature control for CH flow on
boiler set too low
Increase CH flow temperature control setting
Air trapped in heating system Bleed radiators and recharge heating system
Desired room temperature exceeded
by large amount
Radiators are too hot Turn down thermostatic radiator valves/room
stat
Room temperature rises instead of
falling
Clock is incorrectly set Check setting
No display or display unit does not
respond
Momentary power failure Switch off boiler at master switch, wait 30
seconds then switch on again
Hot water temperature too low Hot water temperature set too low Check setting
Hot water not in timed period on the
programmer
Check programmer settings
System pressure low Leak within the heating system Check system for obvious leaks
WARNING:
Caution must be exercised when venting
radiators or adjusting system pressure
after commission of your boiler.
Do not repeatedly vent your radiators, if
the problem persists, contact a heating
engineer.
Do not vent air from radiators whilst the
central heating is switched on: turn your
boiler off.
Whilst venting radiators do not allow the
pressure on the boiler to drop below the
pressure at which it is normally set.
CAUTION:
If the pressure in your heating system is
repeatedly rising (this can be checked via
the boiler pressure gauge and should be
checked when the system is cold), and
especially if you need to keep venting the
radiators, urgent action is required and
you must contact a heating engineer. This
can indicate that there is corrosion
occurring within the heating system.
This must be properly addressed to
prevent serious damage to the entire
system.
Failure to properly maintain the heating
system may affect your warranty.
10


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