Bosch Condens 7000 F Installation And Maintenance Instructions For The Contractor page 51

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