Bosch FW 120 Installation And Operating Instructions Manual page 57

Information displayed (
Text
Fault 50
Solar pump jammed or air in system
Fault 51
Incorrect temperature sensor type
connected
Fault 52
Temperature sensors reversed
Fault 53
Temperature sensor fitted in wrong
location
Fault 54
Temperature for thermal disinfection not
reached in solar cylinder
Fault 55
Solar system not yet commissioned
Fault 56
At least one pump/valve in manual mode
1) The display text is shown at the BUS subscriber (e.g. remote control) that has identified the fault.
The other BUS subscribers will instead display the code that corresponds to the display text.
items 1, 3 and 4 in Fig. 25)
Code Cause
121
122
123
132
133
124
125
145
146
147
154
Solar circuit pump (SP)
sticking due to physical
blockage.
Air in solar thermal system.
Collector temperature sensor
type used as cylinder
temperature sensor (T ).
2
Cylinder temperature sensor
type used as collector
temperature sensor (T )
1
Temperature sensor type PTC
1000 used as cylinder
temperature sensor (T ).
2
Temperature sensor type PTC
1000 used as collector
temperature sensor (T ).
1
Temperature sensors
(T and T ) reversed.
1 2
Collector temperature sensor
(T ) fitted on collector array
1
inlet.
Maximum temperature for
solar cylinder too low.
Pump rate of disinfection
pump (PE) too low.
Thermal disinfection
terminated manually before
required temperature was
reached in solar cylinder.
Solar thermal system is not yet
in operation.
Pump (SP) in manual mode.
Pump (PE) operated manually.
Troubleshooting | 57
Remedy (by contractor)
Unscrew and remove slotted
screw on pump head and use a
screwdriver to release pump
shaft. Do NOT strike the pump
shaft with the screwdriver.
Vent solar thermal system and
top up with heat transfer fluid
if necessary.
Use correct type of
temperature sensor.
Specification in ISM
installation instructions.
Check temperature sensors
and swap connections if
necessary.
Fit collector temperature
sensor (T ) close to collector
1
array outlet.
Set higher maximum
temperature for solar cylinder.
Select higher pump stage on
disinfection pump (PE) or, if
possible, open butterfly valve
further.
This is not a fault.Message is
shown only for 5 minutes.
Fill and vent solar thermal
system according to its
documentation and prepare it
for commissioning. Then start
up solar thermal system.
Reset pump parameter to
"Auto".
6 720 800 844 (2012/02)