Solar Compatibility; Burner Diagnostics Mode - Worcester Greenstar Heatslave II ErP 12/18 Installation, Commissioning And Servicing Instruction Manual

8.8

Solar compatibility

During a DHW demand
(DHW flow >2 l/min
[1] Normal operation: the tank will cool more slowly for the same DHW performance if the DCW is above normal DCW temperature, thus saving fuel.
[2] Solar tank hot: the burner will not be required at high DHW flow rate and the tank will boost the solar heated water if the temperature drops.
[3] Solar tank will satisfy the DHW requirements: therefore the appliance allows the water to pass straight through without taking any action apart
from monitoring the temperatures. To utilise the solar panels to their maximum potential, the solar tank thermostat will need to be set high and
the Heatslave II DHW setting low.
[4] Solar tank overheat: DCW above solar tank limit, appliance will not operate pump or burner and fault code will be displayed in the service menu.
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.
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 burner control box will not reset until the power has been interrupted to the burner.
Greenstar Heatslave II ErP - 6 720 813 344 (2014/09)
1
DCW in less than
40°C
2
DCW in more than
40°C (but less
than 3 below)
(for 2 sec or more)
3
DCW in greater than tank setpoint
minus (no demands offset + 2°C )
(for 2 seconds or more)
4
DCW in 80°C or
Fault code 380 displayed
more (for 2
seconds or more)
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.
Normal DHW
operation
Burner OFF for
DHW 10 l/min &
above (burn
allowed for tank
reheat during
demand)
Burner OFF, pump OFF
(any tank reheat demand
suppressed until after
DHW demand ends)
Burner OFF, pump OFF
within service menu (i1)
Release
the service
mode button.
To reset the
burner press the
lockout reset
on the burner
control box.
Burner LOCKOUT
Power to burner.
No controls
lockout.
Fault finding and diagnosis
DCW in less than tank
setpoint minus (no
demands offset + 3°C)
DCW in below
79°C (for 2 sec
or more)
6 720 805 209-74.1TL
The controls
lockout is reset
but the burner
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.
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