Bosch HPC 400 - Troubleshooting Common Faults; Eliminating Sensed Faults; Removing a Displayed Fault

Eliminate fault
are set too low .
Temperature for heating mode is set
too low .
System is in summer mode .
o BOSCH
When the thermostatic valves are fully open . set a higher
temperature for heating mode .
Switch system over to winter mode (~ Chapter 5.2. 3.
page 20) .
Flow temperature controller on Set flow temperature controller higher (~ operating
f- a_d_d_ if _ lo _ na _l_h_ ea _t_ so _u_ rc _e_s_e_t t_o_o_ lo _w_. --JI instructions for the heats _o_u_ rc _e .:.. ). _____ _
I Air in the heating system . Bleed the radiators and the heating system .
Installation location of the outdoor T Contact contractor to install the outside temperature
temperature
sensor is unfavourable . sensor at a suitable installation location .
Required room temp -e-r- at - ur -e-r:- Ra -d :'- ia - to -r-s become too hot. I' Set temperature for the operating mode concerned lower .
greatly exceeded . Set temperature for all operating modes lower .
Set thermostatic valves in adjoining rooms lower.
If the remote control is installed in the
---- ----/
Contact contractor to install the remote control at a
Excessive room
temperature fluctuations .
Temperature rises instead
of dropping .
reference room . the installation
location of the remote control is
unfavourable . e.g . external wall . close
suitable installation location .
to window . in a draught ...
~
Temporary influence ':: ':" of :- e- xt - er -n- al -h- ea -t ) Contact contractor to install the remote control at a
on the room . e.g. from solar exposure , SUitable installation location .
room lighting , lV. fireplace, etc .
Incorrect time set. Setting the time .
Room temperature too high The building retains a lot of heat.
Set an earlier switching time for setback mode .
during setback mode .
~
~ ~~ I
DHWtemperature
1
)
on heat source not Check the settings on the progr ~ mming unit.
set too low .
I The DHW at the draw·off
points is not reaching the
required temperature .
I ___ _
f
DHW program incorrectly set. Set DHW prog _ ra _m_. __
The DHW heating configuration does Contact contractor to check the settings .
not suit thiS heating system .
Mixer set lower than the required DHW Ilf you are in doubt . contact your contractor to come and
temperature . check the mixer setting .
o is displayed constantly in Solar system set incorrectly .
the info menu under solar
yield even though the solar
system is in operation .
Table 48 Eliminating "sensed' faults
Contact contractor to check the settings on the user
interface .
1) See the operating instructions for the additional heat source for further information .
38 HPC400-6720821983(2017/07)
@ BOSCH
Eliminate fault
9.2 Remov i ng a di splayed fault
If there are multiple faults. the fa ult with the highest priority will
be displayed . Fault codes and sub-codes are displayed . The
codes inform your contractor about the possible cause .
Confirm a fault (press the selector) to switch to the standard
display . The continued presence of the fault is indicated in the
info line. If the fault is still active. it can be restored to the
display by pressing the Back key .
NOTICE : System damage due to frost! The
system can freeze up ifitis taken outof service
due to fault shutdown .
~ Use Tab . 49 to check if the fault can be
fixed .
~ If the fault cannot be fixed . contact your
contractor immediately .
The cause can be a fault on the user interface . in a component.
in an assembly or on the heat source .
A
fault in your system is indicated on the display of the user
interface .
The system keeps operating as much as possible ; in other
words, heating of the home can continue .
Fault display
&
---_.
.11/1010
H eat!na system f au lt . Pl ease contact
yo ur "'atlng . nllnear,
I
OK
I
6720 811 136-43. 10
Fig . 6 Error display
F l UlU you ca n fix you rself
Nothing appears on the disp l ay
I
The power supply to the user interface
has been interrupted .
Switch on the system.
~ Check that the user interface is
correctly seated in its wall bracket.
( 01
5450 Warning Zl Condensate
drain blocked
Check whether the condensate drain is
dirty (e .g. leaves . soil)
I ~ Clean the condensate drain
I A01
5451
AOl 5454
I
AOl 5526
1
Service required on heat 1 Maintenance required . The system
pump keeps operating as far as possible .
I ~
Make arrangements to have the
system serviced by your contractor .
Warning Z2 Condensate
drain blocked
Check whether the condensate drain is ~
, dirty (e .g. leaves , soil)
Clean the condensate drain
Alarm Z2 Defrosting failed Check whetherthe outdoor unit is dirty .
J
Check the evaporator in particular for
dirt .
~ Clean the outdoor unit (particularly
the evaporator)
All 1 1010 No communication via BUS
conn EMS 2
~ Check that the user interface is
correctly seated in its wall bracket.
~ Set date/time.
All 1038 Invalid time/date
All
L
3061 No communication with
3062 I mixer module (3061 :
3063 heating circuit 1 ..... 3064 :
3064 heating circu ::,: it ..,: 4 !..., ) --:---!-------------t::--; :;;:::-::;:-:;:
All 6004 No communication w. solar ~ Check thatthe user interface is
module correctly seated in its wall bracket.
7'able49
HPC400 - 6720821983 (2017/07) 39