BSH HN678G4S1, Repair Instructions

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Repair Instructions – Cooking
2016-03-10 / DIS 184_58300000140186_ara_en_k Copyright by BSH Hausgeräte GmbH Page 1 of 181
1 Concerning this document 4
1.1 Important information......................................................................................4
1.2 Explanation of symbols...................................................................................4
2 Safety 6
2.1 Qualification.................................................................................................... 6
2.2 General safety information............................................................................. 6
2.3 Product-specific safety information.................................................................7
2.4 Measures after each repair............................................................................ 8
3 Design and function 9
3.1 Baking sensor (Lambda sensor).................................................................... 9
3.2 Meat temperature probe (NTC)....................................................................13
3.3 Brushless direct current motor..................................................................... 14
3.4 Steam generation......................................................................................... 17
3.5 Steam generator........................................................................................... 18
3.6 Double pump................................................................................................ 20
3.7 EcoClean Direct............................................................................................21
3.8 Suitability of cookware..................................................................................22
3.9 Cooking compartment temperature sensor (Pt500 / Pt1000)....................... 25
3.10 Fold-down door.............................................................................................26
3.11 Magnetron..................................................................................................... 27
3.12 Swivelling panel............................................................................................ 29
3.13 Temperature regulation in the various operating modes.............................. 30
3.14 Temperature regulation in the various operating modes.............................. 35
3.15 Vapour extraction system............................................................................. 40
4 Fault diagnosis 43
4.1 Result faults................................................................................................ 43
Food is not cooked.......................................................................................43
Food is heated too slowly............................................................................ 43
Cleaning action is inadequate...................................................................... 43
Pieces of dough form a skin........................................................................ 43
Food dries out.............................................................................................. 44
4.2 Malfunctions................................................................................................ 45
Rails - Sloping down at the back/askew...................................................... 45
Rails - Flashovers/discoloured marks.......................................................... 45
Rails - Flashovers between rail and enamelled baking tray.........................45
Rails - Jam/become caught..........................................................................46
Rails - Uneven running after pyrolysis......................................................... 46
Baking tray/universal pan warped, bent, bounces ...................................... 46
Operating ring can be rotated easily / no change on the display................. 46
Operating ring does not respond / no display.............................................. 47
Operating ring is hard to turn / remains stuck in a specific position............. 47
Operation is not interrupted when the door is opened................................. 47
Display background white/display hard to read............................................47
Fault code is displayed.................................................................................47
Appliance does not generate any steam......................................................48
Appliance continues to heat although the setpoint temperature has been
attained......................................................................................................... 48
Brightness of microwave differs from that of the oven................................. 48
No microwave output / 8A fuse was blown.................................................. 49
Folding panel only opens partially................................................................49
Folding panel opens at an angle..................................................................49
Folding panel does not close automatically................................................. 49
Cooling fan overruns for too long.................................................................49
NeffLight in the "slide and hide" door flashes briefly....................................50
Reset during operation in main menu "MyProfile"........................................50
Door (fold-down door) opens during operation (only microwave
appliances)....................................................................................................50
Door (fold-down door) cannot be closed (only microwave appliances)........ 50
Door (fold-down door) does not open 90°....................................................51
Door (fold-down door) closing is displayed (only microwave appliances).....51
Clock gains > 1 minute every day................................................................51
Time - ist fast / slow..................................................................................... 51
Water escapes into the cooking compartment via the steam inlet................52
Remove water tank is displayed when the pyrolytic self-clean system is
started........................................................................................................... 52
Fill water tank is displayed although the tank is still full...............................52
Increased water consumption when operating in “steaming” mode............. 53
4.3 Noise............................................................................................................ 54
Rails squeaking............................................................................................ 54
High-frequency whistling sound....................................................................54
Cooling fan motor makes a high-frequency noise........................................54