Fault finding and diagnosis
Greenstar Heatslave II
ErP -
6 720 813 344 (2014/09) 51
8.6 CH function chart
Fig. 91
Appliance
Mains power
supply ON
Pump OFF
3WV to DHW
[200]
230V on CH LR AND
fascia mounted
programmer CH =
ON (if fitted)
(and no current
DHW/ Heatslave tank
demand)
Anti fast cycle delay (10 minut es
from CH demand end) [202 only
displayed if a new CH demand is
started]
NO DEMAND
(system standby)
Blue light OFF
[203]
Pump overrun ON
(3 minutes from
burner OFF)
[200]
CH
DEMAND
[200]
Blue light ON
Radiator symbol on
display and 3WV to CH
[200]
Flow temp less than
CH setpoint minus
10°C
[200]
Pump
ON
[200]
Flow at more than
CH setpoint minus
CH adaptive setpoint
[200]
Burner
ON
[200]
Burner
OFF
[200]
Flow temp peaks:
CH adaptive offset
adjusted
[200]
Blue light OFF
Burner OFF Radiator
symbol off display
[200]
End of CH DEMAND
(room stat AND/ OR
programmer CH OFF)
[200]
6 720 805 209-71.1T
Numbers in square brackets are the cause code of the
current appliance operation, visible in the service menu
slot 1 (i1),
Key
3WV 3 way valve (diverter valve).
CH set point The target flow temperature set on the CH
fascia control knob.
CH adaptive offset The learnt offset temperature applied to the
CH flow so that the peak flow temperature
after burner OFF = CH set point.
Anti fast cycle delay To stop the appliance short cycling if a room
stat is intermittently calling or is poorly
positioned, there is a 10 minute delay for CH
demands timed from the last CH demand end.
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