SERVICING AND SPARES
Greenstar Highflow CDi
ErP
- 6720818077 (2016/04)32
6.2 Service function
Setting boiler to maximum:
▶ Press and HOLD the Service engineer button [11] 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. 43 Fascia guide
[1] Master switch for ON/OFF
[2] Position for optional programmer
[3] Display
[4] System pressure gauge
[5] Fault reset button
[6] ECO button (domestic hot water pre-heat ON/OFF)
[7] Not used
[8] Domestic hot water temperature control
[9] Mains ON/OFF indicator + blue fault diagnostic light
[10] Central heating temperature control
[11] Service engineer button
[12] Service menu button
[13] 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.
▶ Pull clip [6] outwards to release expansion vessel [7].
▶ Swing expansion vessel [7] outwards.
▶ Release four screws [8] to remove the inner case cover [9].
Fig. 44 Access for servicing
6.4 Fan pressure test
▶ Remove the test point cover
▶ Connect a manometer to the fan pressure test point, [1].
▶ Set the boiler to maximum output.
▶ After measurement replace test point cover.
Pressure readings will be negative, refer to figure 46.
Fig. 45 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 46 below.
Fig. 46 Fan control pressure readings
▶ When running in the Service engineer mode, the
boiler will operate both the Central Heating and DHW
circuits.
▶ It will be necessary to run water through the DHW
circuit to ensure that the boiler will not cycle during
Service mode.
For easier access to the inner case, the expansion vessel
can be unhooked (by removing the retaining screw on
the hinge) lowered and moved to the side. Take care not
to overstretch the flexible pipe connections.
1
2
3
4
5
6
max
2
3
1
04
bar
reset
eco
1
2
3
4
e
6
maxmin
6720818977-13.1Wo
1
2
3
4
5
6
7
8
9
10
11
12
13
NOTICE: Fan pressure test
▶ The boiler must be run at maximum output for the
fan pressure test.
6720818077-24.1Wo
4
5
9
8
7
2
3
6
1
6720648568-35.1Wo
1
Fan pressure
test point
NG Boilers
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
HF 440CDi:
HF 550CDi:
- 4.1
- 5.2
HF 440CDi:
HF 550CDi:
- 4.1
- 5.2
6720648665-21.1Wo
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