Burner Diagnostics Mode - Worcester Greenstar Heatslave II 12/18 Installation, Commissioning & Servicing Instructions

8.9

Burner diagnostics mode

Service/installation engineers only.
To access the Burner control box diagnostics or to use the burner reset
button to reset the burner, the burner diagnostic mode must be
activated as follows:
Burner LOCKOUT
Blue light flashing & 9F 855 cause
code on display (there is no power to
the burner when the controls are in
lockout.
Normal operation.
Fig. 89
The burner diagnostics mode can be manually exited at any time when the burner is locked out by holding down the service mode button
whilst pressing the controls reset button.
Fault code 9F 856: If burner lockout is reset 5 times in one demand period using the fascia reset button the controls will lockout with a new code: 9F
856. This is to protect the burner components against over use of the reset and requires a power down of the appliance to reset. The burner control box
also has this facility, if the reset button is operated 5 times the control box will not reset until the power has been interrupted to the burner.
Greenstar Heatslave II External ErP - 6 720 813 345 (2014/09)
Hold down the
service mode
button then press
the controls reset
button
Burner diagnostics
To reset the
mode is
burner press the
automatically
exited after 5 lockout reset
on the burner
minutes of burner
control box.
operation without
a lockout.
Burner LOCKOUT
Power to burner.
No controls
Fault finding and diagnosis
The controls
Release
lockout is reset
the service
but the burner
mode button.
lockout is not reset.
The burner
dianostics can
now be accessed
& the burner
worked on without
locking out the
controls if the
burner locks out.
lockout.
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