Bosch Condens 7000 F - Page 51

Operating and fault displays
51
Condens 7000 F – 6720871560 (2019/11)
V 9Y 500
501
502
503
Fault in the
internal relay of
the burner control
unit.
Internal electronic fault in
the burner control unit.
Press the "Reset" button and wait to
see if the fault is eliminated.
 If the fault persists after "Reset", the
burner control unit must be
replaced.
V A01 800 Outside
temperature
sensor is faulty
Temperature sensor
incorrectly connected or
installed.
Breakage or short circuit in
the sensor lead.
Temperature sensor is
defective.
Check configuration.
Check the sensor port and sensor
lead.
Check that the sensor is correctly
mounted.
Check resistance values of
temperature sensor against table.
 Change configuration.
 Eliminate the contact problem if
necessary.
 Replace the temperature sensor if
necessary.
 If the connecting lead, contacts and
resistance values are all OK, replace
the control unit.
V A01 808 DHW temp.
sensor 1
defective. If nec.,
deactivate DHW
function
Temperature sensor
incorrectly connected or
installed.
Breakage or short circuit in
the sensor lead.
Temperature sensor is
defective
Check the sensor port and sensor
lead.
Check the sensor mounting on the
cylinder.
Check resistance values of
temperature sensor against table.
 Eliminate the contact problem if
necessary.
 Replace the temperature sensor if
necessary.
 If the connecting lead, contacts and
resistance values are all OK, replace
the control unit.
V A01 810 DHW stays cold Constant drawing or
system leak.
Temperature sensor
incorrectly connected or
installed.
Breakage or short circuit in
the sensor lead.
Temperature sensor is
defective.
Cylinder primary pump
incorrectly connected or
faulty.
Check the sensor port and sensor
lead.
Check that the sensor is correctly
mounted.
Check resistance values of
temperature sensor against table.
Check that the cylinder primary
pump is working, e.g. by carrying out
a function check.
 Repair any leaks.
 Eliminate fault in sensor port and
sensor lead.
 Replace the temperature sensor if
necessary.
If necessary, replace the cylinder
primary pump.
V A01 845 Hydraulic
configuration not
supported
Heat source does not
support the existing
hydraulic configuration
(e.g. because more pump
outputs are required than
are available)
Check configuration.  Configure DHW at the module or
uninstall.
 Configure heating circuit 1 at the
module or uninstall.
 Set heating pump to “None”.
V AD1 818 Heat source stays
cold
If the floor standing boiler
remains below the pump
logic temperature for a
specified period even
though the burner is in
operation, this fault display
is generated.
Check configuration.  Check the system configuration and
pump parameters in the control unit.
 If required, adjust the system
configuration and pump parameters
in the control unit.
 Check the non-return valve is
working.
 Retrofit if required.
 Check whether check valves are in
operating position.
V CO 568 Water pressure
sensor fault
(broken cable).
Water pressure sensor
break (voltage > 3.5 V).
Check connecting cable running to
water pressure sensor.
Check water pressure sensor.
 Rectify any breaks.
 Replace water pressure sensor.
V CO 569 Water pressure
sensor fault
(short-circuit).
Water pressure sensor
short-circuit (voltage
<0.5V).
Check connecting cable running to
water pressure sensor.
Check water pressure sensor.
 Rectify any short-circuits.
 Replace water pressure sensor.
Type
1)
Error
code
Sub-
code
Cause Description Test procedure/Cause Action