Bosch Condens 7000 FP - Page 62

Operating and fault displays
Condens 7000 FP – 6721846699 (2022/12)
62
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 installation of sensors.
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.
V CY 566 Return
temperature < -5
°C (interruption)
The control unit is
receiving implausible
values from the return
temperature sensor.
Check the connecting lead between
the burner control unit and the return
temperature sensor.
Check the electrical connection of
the connecting lead at the burner
control unit and return temperature
sensor.
Check resistance values of
temperature sensor against table.
Burner control unit defective.
 Replace the connecting lead if
necessary.
 If necessary, eliminate the
contact problem.
 Replace the temperature sensor
if necessary.
 If the connecting lead, contacts
and resistance values are all OK,
replace the burner control unit.
V CY 567 Return
temperature
> 130 °C (short-
circuit)
The control unit is
receiving implausible
values from the return
temperature sensor.
Check the connecting lead between
the burner control unit and the return
temperature sensor.
Check the electrical connection of
the connecting lead at the burner
control unit and return temperature
sensor.
Check resistance values of
temperature sensor against table.
Burner control unit defective.
 Replace the connecting lead if
necessary.
 If necessary, eliminate the
contact problem.
 Replace the temperature sensor
if necessary.
 If the connecting lead, contacts
and resistance values are all OK,
replace the burner control unit.
Type
1)
Fault
code
Sub
code
Cause Description Test procedure/Cause Action