Burner Diagnostics Mode; Riello Digital Control Boxes; 8.10.1 Control Box Led Codes - Bosch WORCESTER Greenstar Heatslave II External 12/18 Installation, Commissioning And Servicing Instructions

Fault finding and diagnosis
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 (no
power to burner when the
controls are in lockout
Normal operation
Table 14
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 4 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 4 times the burner control box will not reset until the power has been interrupted to the burner.
8.10

Riello digital control boxes

8.10.1 Control box LED codes

Lockout types (burner in lockout)
Refer to Fault finding chart, section 8.10.2, go to line number on chart
RED steady ON
Lockout for no flame after safety time
RED 0.5 seconds ON/ RED 0.5 seconds OFF
Lock out for false flame signal
RED 0.2 seconds ON /RED 0.2 seconds OFF
Lock out for maximum number of flame loss re-lights
RED 2.5 seconds ON / ORANGE 0.5 seconds ON
Lock out for fan motor failure
RED 2.5 seconds ON / GREEN 0.5 seconds ON
Lock out for oil valve circuit driver failure
ORANGE 0.5 seconds ON / GREEN 0.5 seconds ON
Lock out for EEPROM failure
Red 0.5s ON / Red 2.5s OFF
Max pre-heat time exceeded (10 minutes)
Table 15
54
Hold down the service mode
button then press the
controls reset button
Burner diagnostics mode is
automatically exited after 5
minutes of burner operation
without a lockout
[3]
[5a]
[9]
[3d]
[8c]
Replace
control
box
[2]
Release the service mode
button
To reset the burner press the
lockout reset on the burner
control box
Burner LOCKOUT Power to
the burner.
No control lockout
Anomaly types (Burner in stand-by)
Green 0.5 s ON /
Green 2.5 s OFF
Fit pre-heat link
Pre-heating time
Green 0.5s ON /
Lock out after 25s
RED 0.5s ON
Extraneous light
Orange steady ON When an anomaly appears during:
Abnormal frequency ▶ pre-purge. the burner remains in pre-
supply purge.
▶ after ignition, burner remains in
operation.
When anomalies disappear the burner re-
starts
Orange 0.2s ON /
Green 0.2s ON
Control box internal
error
Green 0.2s ON / Remote reset / pushbutton is activated for
Red 0.2s ON more than 60 seconds.
Reset pushbutton or When anomaly appears the burner does
remote reset failure not stop
Table 16
Greenstar Heatslave II External
The controls lockout is reset
but the burner lockout is NOT
reset
The burner diagnostics can
be accessed & the burner
worked on without locking
out the controls if the burner
locks out.
2022+ 6 721 843 980 (2022/01)