SERVICING AND SPARES
Greenstar FS CDi
ErP
6720818079 (2016/04)
30
6.2
Service function
Setting boiler to maximum:
▶ Press and HOLD the Service engineer button [8] for 10 seconds and
set Central Heating temperature to maximum.
The Service engineer button will illuminate continually.
The boiler will stay in this mode for 15 minutes unless the Service
engineer button is pressed again.
Fig. 40 Fascia guide
[1]
Master switch for ON/OFF
[2]
Display
[3]
Fault reset button
[4]
Not used
[5]
Not used
[6]
Mains ON/OFF ind fault diagnostic light (blue)
[7]
Temperature control
[8]
Service engineer button
[9]
Service menu button
[10] Burner ON indicator light (green)
6.3
Service inspection
▶ Grip the outer sides of the front panel [1] pull away from the ball
catches [2] and lift off the lugs [3]
▶ Remove retaining screw [4] to swing control panel assembly [5]
outwards to its full extent.
▶ Release four screws [6] to remove the inner combustion cover [7].
Fig. 41 Access for servicing
6.4
Fan pressure test
▶ Connect a manometer to the fan pressure test point, [1].
▶ Set the boiler to maximum output.
▶ After measurement replace test point cover.
Fig. 42 Fan control pressure test
With the boiler running at maximum output, measure the fan pressure:
▶ The pressure will read negative, refer to the chart in figure 43 below.
Fig. 43 Fan control pressure readings
▶ If the manometer reading is in the white area of the chart the heat
exchanger/exhaust path/condensate trap does not require
attention.
▶ If the manometer reading is in the black area of the chart then carry
out the following checks:
– Check that the condensate trap is not blocked.
– Check the exhaust paths for restrictions.
– Clean the heat exchanger with a suitable cleaning tool, refer to
section 6.7 - Cleaning the heat exchanger.
▶ Re-check the fan pressure readings.
If the boiler, after completing the above checks, fails the fan pressure
test then contact Worcester, Bosch Group for advice.
▶ After the measurements are taken switch the boiler off.
▶ Disconnect the manometer and replace the test point cover.
1
2
3
4
5
6
max
reset
eco
6720818979-03.1Wo
1
2
3
4
5
6
7
8
9
10
7
6
6720648568-34.1W
o
5
3
1
4
2
NOTICE:
Fan pressure test
▶ The boiler must be run at maximum output for the
fan pressure test.
6720648568-35.1W
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1
Fan pressure
test point
NG Boilers
FAN PRESSURE TEST
Clean the Heat Ex.
Heat Ex. ok
LPG Boilers
0
-6
-5
-4
-3
-2
-1
-8
-7
mbar
0
-6
-5
-4
-3
-2
-1
-8
-7
mbar
FS 30CDi:
FS 42CDi:
- 4.1
- 5.2
FS 30CDi:
FS 42CDi:
- 4.1
- 5.2
6720648568-33.1W
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