Inspection and maintenance | 49
6720872361 (2017/04)Greenstar combi 100 p / 151 p
Heat exchanger
NOTICE:
Damage to the coating of the heat exchanger.
▶ Cleaning of the heat exchanger should not be necessary until five
years after the initial commissioning.
▶ Only use a Bosch cleaning blade and Bosch cleaning brush.
▶ Only clean heat exchanger in case if soiling is clearly visible.
Heatronic boiler control
In case of a component defect, a fault is shown on the display.
The Heatronic boiler control monitors all safety and control components.
NOTICE:
The Heatronic boiler control can be damaged by leaking water.
▶ Cover the Heatronic prior to working on water filled components.
Important notes
An overview of the faults can be found on page 56.
• The following analytical tools are needed for service and
maintenance:
– Electronic flue gas analyzer for CO
2
, O
2
, CO, and flue gas
temperature
– (0 to 30 mbar)
– pH Test strips
– Glycol tester of antifreeze is being used
• Special tools are not required.
• Approved lubricants are:
– For parts touched by water: Unisilkon L 641 (part-
# 8 709 918 413 0)
– or fittings: HFt 1 v 5 (part-# 8 709 918 010 0).
▶ Use part-# 8 719 918 658 0 as heat conducting paste.
▶ Use only genuine Bosch spare parts.
▶ Request spare parts.
▶ Replace removed gaskets and O-rings with new ones.
HAfter the inspection/maintenance
▶ Re-tighten all loosened threaded connections.
▶ Restart the appliance ( page 36).
▶ Check all connections used during maintenance for leaks.
▶ Check the gas-air ratio.
14.1 Description of various steps
14.1.1 Calling up the latest fault (service function 6.A)
▶ Select service function 6A (page 43).
An overview of the faults can be found on page 56.
14.1.2 Fresh water filter in the cold water pipe
▶ Close cold water tap.
▶ Depressurize the cold water pipe.
▶ To access the filter remove the safety clip (step 1), pull out the pipe
(step 2), and remove the filter from the pipe (step 3).
▶ If necessary, clean with plastic brush under running water.
Fig. 63 Strainer in the cold water pipe
14.1.3 Plate-type heat exchanger
If the DHW output on the combi boiler is significantly reduced:
▶ Check filter in the cold water pipe for contamination ( Fig. 49).
▶ Depressurize the appliance.
▶ Remove plate type heat exchanger and replace
-or-
▶ Descale with descaling agent approved for stainless steel (Grade
316-1.4401).
To remove the plate type heat exchanger:
▶ Unplug electrical connections.
▶ Remove hose from safety relief valve.
Fig. 64 Unplugging electrical connections / removing hose from safety
relief valve
6 720 641 933-92.1o
1
2
3
6 720 641 933-46.2O
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