Worcester CDi Combi N.G Installation and operation manual

Supplied By www.heating spares.co Tel. [phone]
UK/IE
ENGINEER‘S SERVICE BOOKLET
FLOOR MOUNTED & WALL HUNG RSF GAS FIRED CONDENSING BOILERS
GREENSTAR CDi RANGE
8716115748-00.1Wo
FOR CENTRAL HEATING SYSTEMS AND INDIRECT FED DOMESTIC HOT WATER
8 716 115 748 (2009/09)
This Service booklet covers the following
boiler ranges:
CDi Combi N.G.
CDi Combi L.P.G.
CDi System N.G.
CDi System L.P.G.
CDi Regular N.G.
CDi Regular L.P.G.
Highflow CDi N.G.
Highflow CDi L.P.G.
FS CDi Regular N.G.
FS CDi Regular L.P.G.

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TABLE OF CONTENTS
8 716 115 748 (2009/09)2
TABLE OF CONTENTS
1 Explanation of symbols and safety precautions 3
1.1 Explanation of symbols . . . . . . . . . . . . . . . 3
1.2 Safety precautions . . . . . . . . . . . . . . . . . . 3
2 layout of boiler . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 CDi Combi boilers . . . . . . . . . . . . . . . . . . . 4
2.2 CDi System boilers . . . . . . . . . . . . . . . . . . 6
2.3 CDi regular boilers . . . . . . . . . . . . . . . . . . 8
2.4 Highflow CDi Combi boiler . . . . . . . . . . . 10
2.5 FS CDi Regular boilers . . . . . . . . . . . . . . 11
3 OPERATION - CDi . . . . . . . . . . . . . . . . . . . . . . . 12
3.1 Initialisation . . . . . . . . . . . . . . . . . . . . . . . 12
3.2 Display messages . . . . . . . . . . . . . . . . . . 12
3.3 Operating elements CDi (Wall hung) . . . 13
3.4 First service level . . . . . . . . . . . . . . . . . . 13
3.5 Second service level . . . . . . . . . . . . . . . . 13
3.6 Resetting service functions to factory
settings . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.7 Select max. or min. heat output . . . . . . . 14
3.8 Reset the appliance . . . . . . . . . . . . . . . . . 14
4 OPERATION - HIGHFLOW CDi and FS CDi
REGULAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1 Initialisation . . . . . . . . . . . . . . . . . . . . . . . 15
4.2 Display messages . . . . . . . . . . . . . . . . . . 15
4.3 Operating elements . . . . . . . . . . . . . . . . . 16
4.4 First service level . . . . . . . . . . . . . . . . . . 16
4.5 Second service level . . . . . . . . . . . . . . . . 16
4.6 Resetting service functions to factory
settings . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7 Select max. or min. heat output . . . . . . . 17
4.8 Reset the appliance . . . . . . . . . . . . . . . . . 17
5 Boiler service functions - CDi Combi & System
boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1 First service level . . . . . . . . . . . . . . . . . . . 18
5.2 Second service level. . . . . . . . . . . . . . . . . 19
5.3 Explanation of service functions . . . . . . . 19
6 Boiler service functions CDi, Highflow CDi
& FS CDi Regular . . . . . . . . . . . . . . . . . . . . . . . . 23
6.1 First service level . . . . . . . . . . . . . . . . . . . 23
6.2 Second service level. . . . . . . . . . . . . . . . . 24
6.3 Explanation of service functions . . . . . . . 25
7 Rectifying faults . . . . . . . . . . . . . . . . . . . . . . . . 27
7.1 Indication of faults . . . . . . . . . . . . . . . . . 27
7.2 Summary . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.3 Notes on using the fault code tables . . . . 28
7.4 Error codes on the display . . . . . . . . . . . 29
7.5 Faults that are not displayed . . . . . . . . . 52
8 Troubleshooting - FW 100 . . . . . . . . . . . . . . . . . 58
8.1 Troubleshooting using the display . . . . . . 58
8.2 Troubleshooting without the display . . . . 62
9 Troubleshooting - FR110 . . . . . . . . . . . . . . . . . . 63
9.1 Troubleshooting using the display . . . . . . 63
9.2 Troubleshooting without the display . . . . 67
10 Troubleshooting - RT10 . . . . . . . . . . . . . . . . . . . 68
11 Troubleshooting - TD 200 . . . . . . . . . . . . . . . . . 69
12 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
12.1 NTC sensor values, CDi appliances . . . . . 71
12.2 CDi fan speeds . . . . . . . . . . . . . . . . . . . . 71
12.3 Highflow CDi &
FS CDi Regular fan speeds . . . . . . . . . . . .71
12.4 NTC sensor characteristics Highflow CDi & FS
CDi Regular appliances . . . . . . . . . . . . . . .72
12.5 Electrical wiring diagrams . . . . . . . . . . . . 73
12.6 Code plugs used with CDi appliances . . . 78
12.7 Code plugs used with Highflow CDi & FS CDi
Regular appliances . . . . . . . . . . . . . . . . . .78
12.8 Approved corrosion inhibitors and anti-freeze
for central heating water . . . . . . . . . . . . .79
12.9 Possible sources of corrosive CFCs . . . . . 79

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EXPLANATION OF SYMBOLS AND SAFETY PRECAUTIONS
8 716 115 748 (2009/09) 3
1 EXPLANATION OF SYMBOLS AND SAFETY PRECAUTIONS
1.1 EXPLANATION OF SYMBOLS
WARNING SYMBOLS
Signal words indicate the seriousness of the hazard in
terms of the consequences of not following the safety
instructions.
•NOTICE indicates possible damage to property or
equipment, but where there is no risk of personal
injury.
•CAUTION indicates possible personal injury.
•WARNING indicates possible severe personal injury.
•DANGER indicates possible risk to life.
IMPORTANT INFORMATION
ADDITIONAL SYMBOLS
1.2 SAFETY PRECAUTIONS
IF YOU SMELL GAS
BDo not smoke or strike matches
BDo not turn electrical switches on or off
BPut out naked flames
BOpen doors and windows
BKeep people away from the affected area
BTurn off the control valve at the meter
BCall your gas company
or
BCall 0800 111 999
BOILER OPERATION:
This appliance must only be operated by a responsible
adult who has been instructed in, understands and is
aware of the appliance‘s operating conditions and
effects.
HEALTH AND SAFETY
The appliance contains no substances that contravene
the COSHH Regulations (Control of Substances
Hazardous to Health regulations 1988).
COMBUSTIBLE AND CORROSIVE MATERIALS
Do not store or use any combustible materials (paper,
thinners, paint etc.) inside or close to the appliance.
Chemically aggressive substances, such as halogenated
hydrocarbons.
The presence of halogenated hydrocarbons in the
combustion air causes surface corrosion on affected
metals.
In order to limit the damage, the source of the air
contamination must be located and sealed off. If this is
not possible, the combustion air must be drawn from an
alternative clean source.
FITTING AND MODIFICATION
Fitting the appliance and any controls to the appliance
must only be carried out by a competent engineer in
accordance with the current Gas Safety (installation and
use) Regulations.
SERVICING
Advise the user to have the system serviced annually by
a competent, qualified engineer, such as British gas or
Gas safe registered personnel, using approved spares.
This will help to maintain the economy, safety and
reliability of the appliance.
Safety instructions in this document are
framed and identified by a warning triangle
which is printed on a grey background.
Electrical hazards are identified by a
lightning symbol surrounded by a warning
triangle.
Notes contain important information in
cases where there is no risk of personal
injury or material losses and are identified
by the symbol shown on the left. They are
bordered by horizontal lines above and
below the text.
Symbol Meaning
Ba step in an action sequence
Æa reference to a related part in the docu-
ment or to other related documents
•a list entry
–a list entry (second level)
Tab. 1

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LAYOUT OF BOILER
8 716 115 748 (2009/09)4
2 LAYOUT OF BOILER
2.1 CDi COMBI BOILERS
Fig. 1 CDi combi layout
1 Flame viewing window
2Ignition electrode and flame sense electrode
3Heat exchanger
4Overheat thermostat
5Access point for cleaning heat exchanger
6Plate to plate DHW heat exchanger
7Pump
8System pressure gauge
9Drain point
10 Mains cold water in
11 CH return
12 Charging link assembly
13 Gas inlet connection 22 mm compression
14 Cover for external wiring connections
15 Control panel in service position
16 Access cover for transformer & PCB
17 DHW out
18 CH flow
19 Trap / syphon outlet connection (22 mm plastic pipe)
20 Inlet pressure test point
21 Trap / syphon
22 Gas valve
23 DHW temperature sensor
24 Air / gas adjustment screw
25 Testing point for fan pressure
26 Fan
27 Primary sensor
28 Expansion vessel
29 Removable top case panel for servicing
1
5
7
8
9
14
15
16
17
18
19
21
23
24
25
26
27
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22
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29
13
10
11
12
2
3
4
6
6 720 611 9 27-09.1 O

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LAYOUT OF BOILER
8 716 115 748 (2009/09) 5
Fig. 2 This diagram shows the compact hydraulics and controls with the mantel and fascia panel removed
6Plate to plate DHW heat exchanger
9Drain point
32 Pump, modulating
36 Flow turbine
37 Unused port
38 Return connection to boiler heat exchanger
39 Auto air vent
40 Flow connection from boiler heat exchanger
41 DHW sensor
42 CH flow connection to isolation valve
43 DHW out connection
44 Cold water in connection
45 CH return connection to isolation valve
46 Diverter valve housing
47 Pressure relief valve
48 Compact hydraulic mounting screw (2) to boiler
49 CH temperature control
50 Mains on/off indicator/diagnostic light (blue)
51 DHW temperature control
52 Central heating boost button
53 Service button
54 Burner on indicator light (green)
55 Master switch on/off
56 Holiday button
57 ECO button
58 Fault reset button
59 Display
60 System pressure gauge
61 Position for optional programmer
36
32
37
6
38
9
43
39
40
41
42
44 45
46
47
49 50
48
51
52
53
54
55
56
57
60
58
59
8 716 115 748 - 01.1Wo
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61

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LAYOUT OF BOILER
8 716 115 748 (2009/09)6
2.2 CDi SYSTEM BOILERS
Fig. 3 CDi System layout
1Flame viewing window
2Ignition electrode and flame sensing electrode
3Heat exchanger
4Overheat thermostat
5Access point for cleaning heat exchanger
6Pump
7System pressure gauge
8Drain point
9Central Heating return
10 Gas inlet connection (22mm compression)
11 Cover for external wiring connections
12 Control panel in service position
13 Access cover for transformer and PCB
14 Central Heating flow
15 Trap /Syphon outlet connector (22mm plastic pipe)
16 Inlet pressure test point
17 Trap / Syphon
18 Gas valve
19 Air / Gas adjustment screw
20 Test point for fan pressure
21 Fan
22 Primary sensor
23 Expansion vessel
24 Removable top panel for servicing
1
5
6
7
8
11
12
13
14
15
17
19
20
21
22
16
18
23
24
10
9
2
3
4
6 720 612 458-02.1O

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LAYOUT OF BOILER
8 716 115 748 (2009/09) 7
Fig. 4 This diagram shows the compact hydraulics and controls with the mantel and fascia panel removed
25 Compact hydraulic mounting screw (2) to boiler
26 Flow unit
27 Auto air vent
28 Return connection to boiler heat exchanger
29 Unused port
30 Pump
31 Pressure relief valve
32 Diverter valve housing
33 Central Heating return connection to service valve
34 Drain point
35 Internal bypass within plastic moulding
36 Central Heating flow connection to service valve
37 System pressure gauge
38 Display
39 Fault reset button
40 ECO button
41 Holiday button
42 DHW temperature control
43 Power ON/OFF indicator / diagnostic light (blue)
44 Central Heating temperature control
45 Position for option controller
46 Central heating boost button
47 Service button
48 Burner on indicator light (green)
49 Power ON/OFF switch
42
41
43
45
46
47
48
40
39
38
37
36
44
29
28
27
33
26
35 32
31
30
25
25
34
8716115 748-04.1Wo
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LAYOUT OF BOILER
8 716 115 748 (2009/09)8
2.3 CDi REGULAR BOILERS
Fig. 5 The diagram shows the controls in the service position with the mantle and fascia panel removed
1
5
6
7
11
12
13
14
16
18
19
20
21
15
17
22
23
10
8
9
2
3
4
8716115748-05.1Wo

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LAYOUT OF BOILER
8 716 115 748 (2009/09) 9
Fig. 6 Front of the control panel
1Flame viewing window
2Ignition electrode and flame sense electrode
3Heat exchanger
4Overheat thermostat
5Access point for cleaning heat exchanger
6Condensate hose
7Drain point
8Trap / syphon outlet connection (22 mm plastic pipe)
9CH return
10 Gas inlet connection 22 mm compression
11 Cover for external wiring connections
12 Control panel in service position
13 Access cover for transformer & PCB
14 CH flow
15 Inlet pressure test point
16 Trap / syphon
17 Gas valve
18 Air / gas adjustment screw
19 Testing point for fan pressure
20 Fan
21 Primary sensor
22 Auto air vent
23 Removable top case panel for servicing
24 Display
25 Fault reset button
26 Non functional on CDi Regular
27 Holiday button
28 Mains On/off indicator/diagnostic light (blue)
29 CH temperature control
30 Central heating boost button
31 Service button
32 Burner on indicator light (green)
33 Master switch on/off
28
29
30
31
32
33
27
26
25
2
4
;?
8716115748-02.1Wo

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LAYOUT OF BOILER
8 716 115 748 (2009/09)10
2.4 HIGHFLOW CDi COMBI BOILER
Fig. 7 Highflow CDi boiler, controls in service position
Fig. 8 Highflow CDi control panel
1Cover - installer module
2Heat store
3Pressure relief valve
4Auto air vent
5Flue gas sampling point
6Primary sensor
7Flue blanking plate
8Fan
9Ignition electrodes & flame sensing electrode
10 Heat exchanger
11 Heat exchanger access panel
12 Air/Gas adjustment screw
13 Expansion vessel
14 Gas valve
15 Condensate pump assembly
16 Circulating pump
17 Optional filling link
18 Runner wheels on mounting frame
19 CH return isolating valve
20 Mains water inlet isolating valve
21 Gas isolating valve
22 DHW outlet
23 CH flow isolating valve
24 DHW sensor
25 Boiler/tank drain & connection point for filling link
26 Flow turbine
27 Filling link isolating valve
28 DHW heat exchanger
29 Tank overheat thermostat
30 Tank temperature sensor
31 Control panel
32 Display
33 System pressure gauge
34 Reset button
35 ECO button
36 Not used
37 DHW temperature control
38 Position of optional controller
39 Mains ON/OFF indicator & fault diagnostic light (blue)
40 CH temperature control
41 CH boost button
42 Service button
43 Burner ON indicator light (green)
44 Master ON/OFF switch
12
3456
7
8
9
10
11
12
13
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8716115748-06.1Wo
32
33
34
35
36
37
38
39
40
41
42
43
44

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LAYOUT OF BOILER
8 716 115 748 (2009/09) 11
2.5 FS CDi REGULAR BOILERS
Fig. 9 FS CDi Regular boiler layout
1Control panel
2Display
3Reset button
4Service function only
5Service function only
6Mains ON/OFF indicator & fault diagnostic light (blue)
7Temperature control
8Boost button
9Service button
10 Burner ON indicator light (green)
11 Master ON/OFF switch
12 Flue knock-out panel
13 Flue outlet blanking covers
14 Ignition electrodes & flame sensing electrode
15 Heat cell high limit thermostat
16 Inner case
17 Gas valve
18 Condensate syphon
19 Mounting frame
20 Return connector
21 Gas isolating valve
22 Flow connector
23 Runner wheel
24 Condensate pump assembly
25 Air/Gas adjustment screw (sealed)
26 Heat cell
27 Primary sensor
28 Flow pipe
29 Auto air vent
30 Heatronic III series control board
31 Data label
32 Flue gas sampling point
33 Combustion air modulating fan
34 Casing support strut
35 Left hand side panel
14
15
16
1
2
3
4
5
6
7
8
9
10
11
12 13
17
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1
31
32
33 34 35
8716115748-07.1Wo

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OPERATION - CDI
8 716 115 748 (2009/09)12
3 OPERATION - CDi
3.1 INITIALISATION
When it is switched on, the appliance performs a self-
test which takes about 10 seconds.
While the test is in progress, the display shows for the
first two seconds . Additionally buttons and
light up orange and the reset button lights up red.
Afterwards the display shows the CH flow temperature.
On completion of the test sequence the appliance is
ready for operation.
3.2 Display messages
The 7-Segment-Display has following display messages
(table 2 and 3):
Displayed value Description Range
digit, dot
followed by
letter
Service function
letter followed
by digit or letter
Error code
two digits decimal value e.g. flow
temperature
00..99
U followed by
0..9
decimal value;
100..109 will be displayed
as U0..U9
0..109
one digit (long
displayed)
followed by two
digits twice
(short displayed)
decimal value (triple-digit);
first digit will be displayed
alternating with two last
digits (e.g.: 1...69..69 for
169)
0..999
two dashes
followed by two
digits twice
code plug number;
the value is displayed in
3steps:
1. two dashes
2. two first digits
3. two last digits
(e.g.: -- 10 04)
1000..
9999
two letters
followed by two
digits twice
version number;
the value is displayed in
3steps:
1. two first letters
2. two first digits
3. two last digits
(e.g.: CF 10 20)
Tab. 2 Display messages
Special
messages Description
Key acknowledgement after pressing
one button (except reset button)
Key acknowledgement after pressing
two buttons simultaneously
Key acknowledgement after
pressing button longer than 3
seconds (storage function)
The display shows alternatively the
CH flow temperature and . The
appliance works continuously at the
minimum power (see service
function 2.F).
The display shows alternatively the
CH flow temperature and . The
appliance works continuously at the
maximum power (see service
function 2.F).
Appliance is in Air purge mode, see
service function 2.C.
The display shows alternatively the
CH flow temperature and . The
Syphon-fill programme is active. See
service function 4.F
The display shows alternatively the
CH flow temperature and
reminding that the next service is
due. The burner service interval of
2324 hours has run out. See service
function 5.F.
The display shows alternatively the
CH flow temperature and . The
pump is blocked. See error E9.
The display shows alternatively the
CH flow temperature and . The
gradient limitation is active. The
primary temperature is rising too
fast and the burner has switched off
for 2 minutes. See error E9.
Tab. 3 Special display messages

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OPERATION - CDI
8 716 115 748 (2009/09) 13
3.3 Operating elements CDi (Wall hung)
Fig. 10 CDi control panel
AOn/off button
BBurner indicator (GREEN)
CService button (ORANGE)
DCentral heating boost button (ORANGE) (in service mode
for displaying and storing values, for selection of max. or
min. heat output)
ECentral heating temperature control
FOn/off and fault indicator (BLUE)
GDHW temperature control
(Not used on Regular boilers)
(Not used on System boilers unless the option integral
diverter valve is fitted)
HHoliday button (GREEN) (in service mode for selecting
downwards)
IECO button (GREEN) (in service mode for selecting
upwards)
JReset button (RED)
KSystem pressure gauge
LDisplay
MCover or optional programmer
3.4 First service level
3.4.1 Display the value of the service function
BPress the button for approximately 10 seconds
(the display shows ). When the button lights up
orange, release it. In the display appears Digit.Letter
e. g. 1.A.
BPress the eco button for going upwards or the button
for going downwards to select the service
function.
BPress the button and release it. After releasing the
button will light up orange. The display shows the
value of the service function.
3.4.2 Set and store values in the service function
BDisplay the value of the service function.
BPress the eco button for going upwards or the
button for going downwards to select the value.
BPress the button for longer than 3 seconds until
appears on the display. After releasing, the button
goes out and the value is stored. The first service level
is active.
3.4.3 Exit service function/service level without
storing
BPress the button to exit the service function
without storing. After releasing the button goes out.
BPress the button to exit service level. After
releasing the button goes out. The display shows the
flow temperature.
3.5 Second service level
3.5.1 Display the value of the service function
BPress the button for approx.10 seconds (the
display shows ). When the button will light up
orange, release it.
BPress eco button and simultaneously for
approximately 3 seconds (the display shows )
until in the display appears Digit.Letter e. g. 8.A.
BPress the eco button for going upwards or the
button for going downwards to select the service
function.
BPress the button and release it. After releasing the
button will light up orange. The display shows the
value of the service function.
3.5.2 Set and store values in the service function
BDisplay the value of the service function.
BPress the eco button for going upwards or the
button for going downwards to select the value.
BPress the button longer than 3 seconds until
appears on the display. After releasing the button
goes out and the value is stored. The second service
level is active.
3.5.3 Exit service function/service level without
storing
BPress the button to exit the service function
without storing. After releasing the button goes out.
First service level is active.
BPress eco button and simultaneously for
approximately 3 seconds (the display shows ) in
order to go to the first service level. Afterwards the
display shows the last selected service function.
-or-
BPress the button to exit all service levels. After
releasing, the button goes out.
Modifications of appliance parameters
only become active after saving.
A
D
F
L
C
B
G
H
M
E
I
K
J
6 720 614 059-19.1 Wo
min
5

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OPERATION - CDI
8 716 115 748 (2009/09)14
3.6 Resetting service functions to factory
settings
To reset all settings on Service levels 1 and 2 to the
factory settings:
BDisplay the value of the service function 8.E (second
service level, value = 0) and store it. The appliance re-
starts with factory settings (see also section 3.1).
3.7 SELECT MAX. OR MIN. HEAT OUTPUT
BPress the button for approximately 10 seconds (the
display shows ). When the button will light up
orange, release it.
BTurn the CH control knob on the right and adjust
maximum heat output (the display shows alternatively
the CH flow temperature and ).
-or-
BTurn the CH control knob on the left and adjust
minimum heat output (the display shows alternatively
the CH flow temperature and ).
BPress the button to exit the function. After
releasing the button goes out.
3.8 RESET THE APPLIANCE
BPress the reset button for 3 seconds and release.
After releasing button the appliance re-starts without
parameter reset. (For a parameter reset see
section 3.6).
Maximum or minimum heat output is only
active for 15 minutes. After this time the
appliance changes to normal mode.
To ensure that the maximum 15 minutes
is achieved, remove the diverter valve
motor and run a hot water tap.

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OPERATION - HIGHFLOW CDI AND FS CDI REGULAR
8 716 115 748 (2009/09) 15
4 OPERATION - HIGHFLOW CDi and FS CDi REGULAR
4.1 INITIALISATION
When it is switched on, the appliance performs a self-
test which takes about 10 seconds.
While the test is in progress, the display shows for the
first two seconds . Additionally buttons and
light up orange and the reset button lights up red.
Afterwards the display shows the CH flow temperature.
On completion of the test sequence the appliance is
ready for operation.
4.2 Display messages
The 7-Segment-Display has following display messages
(table 2 and 3):
Displayed value Description Range
digit, dot
followed by
letter
Service function
letter followed
by digit or letter
Error code
two digits decimal value e.g. flow
temperature
00..99
U followed by
0..9
decimal value;
100..109 will be displayed
as U0..U9
0..109
one digit (long
displayed)
followed by two
digits twice
(short
displayed)
decimal value (triple-
digit);
first digit will be displayed
alternating with two last
digits (e.g.: 1...69..69 for
169)
0..999
two dashes
followed by two
digits twice
code plug number;
the value is displayed in
3steps:
1. two dashes
2. two first digits
3. two last digits
(e.g.: -- 10 04)
1000..
9999
two letters
followed by two
digits twice
version number;
the value is displayed in
3steps:
1. two first letters
2. two first digits
3. two last digits
(e.g.: CF 10 20)
Tab. 4 Display messages
Special
messages Description
Key acknowledgement after pressing
one button (except reset button)
Key acknowledgement after pressing
two buttons simultaneously
Key acknowledgement after
pressing button longer than 3 sec-
onds (storage function)
The display shows alternatively the
CH flow temperature and . The
appliance works continuously at the
minimum power (see service
function 2.F).
The display shows alternatively the
CH flow temperature and . The
appliance works continuously at the
maximum power (see service func-
tion 2.F).
Appliance is in Air purge mode, (see
service function 2.C)
The display shows alternatively the
CH flow temperature and . The
Syphon-fill programme is active. See
service function 4.F.
When the control is in internal heat
bank demand and syphon fill is not
active, then the seven segment dis-
play will alternate between the pri-
mary temperature and the tank
demand symbol
Tab. 5 Special display messages

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OPERATION - HIGHFLOW CDI AND FS CDI REGULAR
8 716 115 748 (2009/09)16
4.3 Operating elements
Fig. 11 Highflow CDi control panel
AOn/off button
BBurner indicator (GREEN)
CService mode button (ORANGE)
DCentral heating boost button (ORANGE) (in service mode
for displaying and storing values, for selection of max. or
min. heat output)
ECentral heating temperature control
FOn/off and fault indicator (BLUE)
GDHW temperature control (Highflow only)
HHoliday button (Service mode back button)
IECO button (GREEN) (Service mode, next button)
JReset button (RED)
KSystem pressure gauge
LDisplay
MCover or optional programmer
4.4 First service level
4.4.1 Display the value of the service function
BPress the button for more than 10 seconds (the
display shows ). When the button lights up orange,
release it. In the display appears Digit.Letter e. g. 1.A.
BPress the eco button for going up (service next) or
button for going down (service previous) to
select the service function.
BPress the button and release it. After releasing the
button will light up orange. The display shows the
value of the service function.
4.4.2 Set and store values in service function
BDisplay the value of the service function.
BPress the eco button for going upwards or the
button for going downwards to select the value.
BPress the button longer than 4 seconds until
appears on the display. After releasing the button
goes out and the value is stored. The first service level
is active.
4.4.3 Exit service function/service level without
storing
BPress the button to exit the service function
without storing. After releasing the button goes out.
BPress the button to exit service level. After
releasing the button goes out. The display shows the
flow temperature.
4.5 Second service level
4.5.1 Display the value of the service function
BPress the button for more than 10 seconds or (the
display shows ). When the button will light up
orange, release it.
BPress eco button and simultaneously for
approximately 3 seconds (the display shows )
until in the display appears Digit.Letter e. g. 8.A.
BPress the eco button for going upwards or the
button for going downwards to select the service
function.
BPress the button and release it. After releasing the
button will light up orange. The display shows the
value of the service function.
4.5.2 Set and store values in service function
BDisplay the value of the service function.
BPress the eco button for going upwards or the
button for going downwards to select the value.
BPress the button for longer than 4 seconds until
appears on the display. After releasing, the button
goes out and the value is stored. The second service
level is active.
Modifications of appliance parameters
only become active after saving.
A
D
F
L
C
B
G
H
M
E
I
K
J
6 720 614 059-19.1 Wo
min
5

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OPERATION - HIGHFLOW CDI AND FS CDI REGULAR
8 716 115 748 (2009/09) 17
4.5.3 Exit service function/service level without
storing
BPress the button to exit the service function
without storing. After releasing the button goes out.
First service level is active.
BPress eco button and simultaneously for
3 seconds (the display shows ) in order to go to
the first service level. Afterwards the display shows
the last selected service function.
-or-
BPress the button to exit all service levels. After
releasing the button goes out.
4.6 Resetting service functions to factory
settings
To reset all settings on Service levels 1 and 2 to the
factory settings:
BDisplay the value of the service function 8.E (second
service level, value = 0) and store it. The appliance re-
starts with factory settings (see also section 3.1).
4.7 SELECT MAX. OR MIN. HEAT OUTPUT
BPress the button for approximately 10 seconds (the
display shows ). When the button will light up
orange, release it.
BTurn the CH control knob on the right and adjust
maximum heat output (the display shows alternatively
the CH flow temperature and ).
-or-
BTurn the CH control knob on the left and adjust
minimum heat output (the display shows alternatively
the CH flow temperature and ).
BPress the button to exit the function. After
releasing the button goes out.
4.8 RESET THE APPLIANCE
BPress the reset button for 3 seconds and release.
After releasing button the appliance
re-starts without parameter reset.
(For a parameter reset see section 3.6).
Maximum or minimum heat output is only
active for 15 minutes. After this time the
appliance changes to normal mode.

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BOILER SERVICE FUNCTIONS - CDI COMBI & SYSTEM BOILER
8 716 115 748 (2009/09)18
5 BOILER SERVICE FUNCTIONS - CDi COMBI & SYSTEM BOILER
5.1 FIRST SERVICE LEVEL (PRESSING THE BUTTON FOR APPROX. 10 SECONDS)
Description Display
Range adjustable from - to/
Description
Reset value (after
parameter reset)
1.A Max. output (heating) *-U0 min adjustable output - 100%
(not on 37 and 42 Combis)
depends on appli-
ance type
1.b Max. output (hotwater - combi only) *-U0 min adjustable output - 100% U0
1.C Pump map (heating)
(wall hung combi & system only)
(see section 5.3.1, 1.C/1.d)
00-05 0 Pump step adjustable
1 Constant pressure high
2 Constant. pressure middle
3 Constant pressure low
4 Proportional pressure high
5 Proportional pressure low
04
1.d Map pump step (heat.)
(wall hung combi & system only)
02-07 2-7 07
1.E Pump switch mode 01-03 1 - 3 02
2.b Max. flow temperature 35-88 35 - 88 °C 88 °C
2.C Air purge mode
(burner keeps off while air purge
mode is on)
00-02 0 off
1 on, automatic deactivation
(on for 8 minutes, then off)
2 permanent on
01
2.F Operating mode 00-02 0 Normal
1 Minimal (for 15 min)
2 Maximal (for 15 min)
00
3.b Anti-cycle time 00-15 0 - 15 min 03 min
3.C Anti-cycle flow temperature differen-
tial
00-30 0-30 K
(Note: 1K =
^1°C)
10 K
3.E Pre heat cycle time (hot water)
(combi only)
20-60 20 - 60 min 20 min
3.F Burner off after DHW demand (hot
water) (combi only)
00-30 0 - 30 min
(0 = 10sec)
01 min
4.F Syphon-fill programme 00-01 0 off,
1 on, boiler min. output
01
5.A Reset service reminder 00 0 must be stored in order to
reset service reminder
00
5.b Fan over-run time 01-18 1-18 (= 10 sec - 180 sec) 03 (30 sec)
6.A Last fault 00 - FF last fault code can be displayed 00
6.d Actual flow rate turbine (combi only) 00-99 0-99 l/min read only
6.E Programmer input 00-11 00, 01, 10, 11
(left digit: heating,
right digit: hotwater)
read only
7.A Fault indicator LED on/off 00-01 0 off
1 on
Flashes in case of error even
when its setting is off (0).
01
Tab. 6 CDi Service - first level

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BOILER SERVICE FUNCTIONS - CDI COMBI & SYSTEM BOILER
8 716 115 748 (2009/09) 19
5.2 SECOND SERVICE LEVEL (ENTER AT THE FIRST SERVICE LEVEL AND PRESS THE
ECO BUTTON AND SIMULTANEOUSLY FOR 3 SECONDS)
5.3 EXPLANATION OF SERVICE FUNCTIONS
5.3.1 FIRST SERVICE LEVEL
1.A MAX. OUTPUT (HEATING)
The heating output can be set to any level between
min. rated heat output and max rated heat output
to limit it to the specific heat requirements.
The factory setting is maximum rated output – it
depends on appliance type.
1.B MAX. OUTPUT (HOTWATER - COMBI ONLY)
The hot water output can be set to any level between
minimum rated hot water output and maximum rated hot
water output to limit it to the specific hot water
requirements.
The factory setting is maximum rated output –
display shows U0.
1.C PUMP MAP (HEATING)
(COMBI & SYSTEM ONLY)
The appliance is supplied with this function set to
4(Proportional pressure high). See pump
characteristics below.
The pump map indicates how the pump is
controlled in heating mode. The pump switches
between the various pump speeds so as to
reproduce the characteristic curve selected.
Changing the pump characteristic can be helpful if
a lower pressure difference will guarantee the
necessary circulation on the basis of the system
dimensions and pump characteristic.
Description Display
Range adjustable from - to/
Description
Reset Value
(after parameter
reset)
8.A Software version CF ** ** - read only
8.b Code plug number -- ** ** 1000-4000; corresponds to
digits 7 to 10 of order number
for example: 8 714 411 062 0
read only
8.C GFA status (not applicable) - - read only
8.d GFA error (not applicable) - - read only
8.E Reset all parameters 00 0 (must be stored in order to
set all parameters to factory
settings)
00
8.F Permanent ignition 00-01 0 = off
1 = on (Do not run for more
than 2 minutes!)
00
9.A Operation mode permanent 00-02 0 normal
1 min
2 max
00
9.b Actual fan speed *..** (Hz) - read only
9.C Actual heat output ** (%) 0-U0 read only
9.d Start fan speed 45-55 45-55 Hz 50 Hz
9.E Turbine signal delay (combi only) 02-08 2-8 [quarter seconds] (corre-
sponds to 0.5-2 sec)
04 (corresponds to
1 sec)
9.F Pump over-run time (CH mode) 00-03 0-3 min 03
Tab. 7 CDi Service - second level
Even if the heating output is limited, the
full rated heat output remains available
for hot water.

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BOILER SERVICE FUNCTIONS - CDI COMBI & SYSTEM BOILER
8 716 115 748 (2009/09)20
The pump map can be selected within:
•0(Pump step adjustable), see service function
1.d (Map pump step (heating))
•1(Constant pressure high)
•2(Constant pressure middle)
•3(Constant pressure low)
•4 (Proportional pressure high)
•5(Proportional pressure low)
The factory setting is:
1.C Pump map (heating) 4(Proportional pressure
high)
Fig. 12 Constant pressure
Fig. 13 Proportional pressure
1-5 Characteristics
HPressure
QWater circulation rate
If this parameter is set to 0 then the pump speed
set under function 1.d (Map pump step (heating))
is active.
1.D MAP PUMP STEP (HEATING)
(combi & system only)
This service function corresponds to the pump speed
switch used on conventional heating pumps.
However, the setting is only active if function 1.C (Pump
map (heating)), is set to 0.
The factory setting is:
1.d Map pump step (heating) 7
Fig. 14 Characteristics
2-7 Characteristics
HPressure
QWater circulation rate
In order to save as much energy as
possible and to minimise the possibility of
water circulation noise, a low
characteristic should be chosen.
200 400 600 800 1200 14001000 1600
0
0,6
0,5
0,4
0,3
0,2
0,1
0
(bar)
H
Q
(l/h)
1
2
3
200 400 600 800 1200 14001000 1600
0
0,6
0,5
0,4
0,3
0,2
0,1
0
(bar)
H
Q
(l/h)
45
200 400 600 800 1200 14001000 1600
0
0,6
0,5
0,4
0,3
0,2
0,1
0
(bar)
H
Q
(l/h)
3
2
4567
6 720 612 126-45.1
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