Worcester Greenstar Heatslave II External 12/18 Instruction Manual page 58

FAULT FINDING
& DIAGNOSIS
230V on CH LR AND
fascia mounted
NO DEMAND
Appliance
programmer CH =
(system standby)
Mains power
ON (if fitted)
Blue light OFF
supply ON
(and no current
[203]
DHW/Heatslave tank
demand)
Anti fast cycle delay (10 minutes
from CH demand end) [202 only
displayed if a new CH demand is
started]
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.
Blue light ON
CH Pump
Radiator symbol on
DEMAND ON
display and 3WV to CH
[200] [200]
[200]
Pump overrun ON Blue light OFF
Pump OFF
(3 minutes from Burner OFF Radiator
3WV to DHW
symbol off display
burner OFF)
[200]
[200] [200]
Flow temp peaks: Flow at more than
Burner
CH adaptive offset CH setpoint minus
OFF
adjusted CH adaptive setpoint
[200]
[200]
[200]
Flow temp less than
Burner
CH setpoint minus
ON
5°C
[200]
[200]
End of CH DEMAND
(room stat AND/OR
programmer CH OFF)
[200]