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Fault finding and diagnosis
8.7
Protection functions
Frost Protection
Appliance:
Appliance automatic frost
protection ( monitors
PHE, flow and internal
tank sensors)
Frost Protection System:
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:
Pump has
Normal
not run for
operation
24 hours
Fig. 92
Power interruption during lockout
Normal
operation
Fig. 93
Key
PHE
Primary heat exchanger.
3WV
3 way valve (diverter valve).
FS
Appliance connection frost stat supply (230 V)
FR
Appliance connection frost stat return (230 V)
52
PHE OR Flow
sensor below
3WV to CH
8°C
PHE OR Flow
sensor below
3WV to CH
4.5°C
Internal tank
T ank will scavenge
sensor 8°C
heat after any burn to
or less
heat tank to 10°C
External 230V frost
thermostat/s ON, (wired
3WV to CH
between FR & FS)
Any CUS
Mains
lockout - Blue
power loss
light flashing
Press reset
button
PHE OR Flow
Pump OFF
Pump
sensor below
ON
9°C
PHE AND
Pump OFF
Flow sensor
(min run time
above 9°C
1minute)
PHE sensor
Pump OFF
Pump ON
above 15°C,
Burner ON
Burner OFF
Internal tank
3WV to
sensor 5°C
DHW
or less
Pump ON
3WV to
for 5
minutes
3WV has
Normal
not moved
operation
for 24 hours
Mains
power
lockout - Blue
restored
light flashing
9F 855
lockout - Blue
light flashing
3WV to
Waiting period
after 5
DHW
of 25 ninutes
minutes
after 3
minutes
T ank sensor
Pump ON
above 10°C,
Burner ON
Burner OFF
Waiting period
DHW
of 25 minutes
F0 263
Press reset
button
IF the original lockout
was due to a burner
lockout (9F, 855) then
the CUS will initialise
and lockout again
Greenstar Heatslave II
ErP -
6 720 813 344 (2014/09)
3WV to
DHW
Pump OFF
after 4
minutes
6 720 805 209-72.1TL
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