Worcester Greenstar Heatslave II External 12/18

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 minutes
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
5°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]
NB: 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 setpoint 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 setpoint.
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.
FAULT FINDING
& DIAGNOSIS
FAULT FINDING & DIAGNOSIS CH FUNCTION CHART
INSTALLATION & SERVICING INSTRUCTIONS FOR GREENSTAR HEATSLAVE II EXTERNAL 12/18-18/25-25/32
6 720 805 210-01
58
FAULT FINDING & DIAGNOSIS
CH FUNCTION CHART