Maintenance; Troubleshooting - Worcester GREENSTAR HEATSLAVE II External 12/18 User Instructions

4

Maintenance

4.1

Troubleshooting

Boiler alert state
Should a fault develop with this boiler (or the system), the
boiler will enter into a fault conditions
1. A fault condition is indicated by a flashing blue operation/
fault light and an triangular alert symbol on the display. A
flashing fault code is also displayed, see figure 8.
This type of fault can often be cleared by pressing the Reset
button .
reset
Fault codes 9F and 855
▶ This is a burner lockout condition, press the
Reset button to restart the burner
▶ If the burner fails to fire and fault 9F 855 is
displayed again, check the oil supply to the
boiler
▶ If you try more than five times to reset the
boiler and fail, no more resets can be
attempted and the fault code 9F 856 will be
displayed, call Worcester, Bosch Group for
assistance, quoting the fault codes, contact
details are on the back page.
Greenstar Heatslave II External ErP – 6 720 813 722 (2014/09)
Boiler reset
1. Press the Reset button
▶ Reset and a tick symbol will be briefly displayed.
▶ If the reset was successful the boiler will return to normal
operation.
▶ If the reset was not successful then the fault code will be
displayed again, and the blue operation/fault light will
continue to flash.
▶ Make a note of these fault codes, in the table below
as an example see figure 8, fault codes E5 and 218.
▶ Contact Worcester, Bosch Group for assistance and quote
any fault codes displayed.
Fig. 8
Flashing fault code Three figure number
e.g. E5
Boiler stops with no fault code
In most cases these fault conditions will clear automatically
when the associated fault clears e.g. waiting for an area of the
boiler to cool down.
If the boiler fails to automatically reset itself after a period of
30mins, call Worcester, Bosch Group, contact details are on
the back page of this manual.
Maintenance
reset on the fascia to clear the fault.
e.g. 218
9