Fault finding and diagnosis
Greenstar Heatslave II External
ErP -
6 720 813 345 (2014/09)
45
8.6
CH function chart
Fig. 85
8.7
Protection functions
Fig. 86
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
displa yed 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]
6 720 805 209-71.1TL
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.
Appliance automatic frost
protection ( monitors
PHE, flow and internal
tank sensors)
PHE OR Flow
sensor below
8°C
Tank will scavenge
heat after any burn to
heat tank to 10°C
3WV to CH
Pump
ON
PHE OR Flow
sensor below
9°C
Pump OFF
after 5
minutes
3WV to
DHW
Waiting period
of 25 ninutes
PHE AND
Flow sensor
above 9°C
Pump OFF
(min run time
1minute)
PHE OR Flow
sensor below
4.5°C
3WV to CH
Pump ON
Burner ON
PHE sensor
above 15°C,
Burner OFF
Pump OFF
after 3
minutes
Internal tank
sensor 8°C
or less
3WV to
DHW
Pump ON
Burner ON
Tank sensor
above 10°C,
Burner OFF
Pump OFF
after 4
minutes
Internal tank
sensor 5°C
or less
3WV to
DHW
External 230V frost
thermostat/s ON, (wired
between FR & FS)
3WV to CH
Pump ON
for 5
minutes
3WV to
DHW
Waiting period
of 25 minutes
Normal
operation
Pump has
not run for
24 hours
Pump run
for 10
seconds
Normal
operation
3WV has
not moved
for 24 hours
When
pump is
OFF
3WV
operated
twice
6 720 805 209-72.1TL
Note: During system frost protection the external frost stat only activates circulation of the water to protect the vulnerable pipework,
the burner will be activated if either internal sensor temperature drops below 4.5°C.
The frost protection system may be activated on commissioning the appliance for the first time during cold weather where
the water used to fill the system is below 8°C or the property has cooled down to below 8°C.
Check the FLOW TEMPERATURE on the programmer to comfirm this situation.
THE CAUSE CODE WILL BE 203 AND THE BLUE LIGHT WILL BE
OFF
DURING ALL FROST PROTECTION FUNCTIONS.
Component antiseize functions:
Frost Protection System:
Frost Protection
Appliance:
