Operating and fault displays
61
Condens 7000 FP – 6721846699 (2022/12)
B 8L 579 No gas supply
pressure.
Although the solenoid
valve 1 must have
opened, there is no gas
supply pressure. The
burner makes three
successive attempts at
starting, then waits for
one hour before making
three more start
attempts.
Check that the gas isolator is open.
Measure the gas supply pressure.
if applicable, Replace air/gas ratio
control valve.
If necessary, replace the air/gas
ratio control valve.
Check whether there is any gas
supply pressure.
V 8P 580 Solenoid valve 1
leaking.
The valve test system
has detected an
unacceptably high
leakage rate on solenoid
valve 1.
Check the air/gas ratio control valve
for contamination.
Gas filter fitted.
Replace air/gas ratio control
valve.
V 8U 581 Solenoid valve 2
leaking.
The valve test system
has detected an
unacceptably high
leakage rate on solenoid
valve 2.
Before replacing the air/gas ratio
control valve, check the function of
the siphon and condensate drain
(condensate back-up).
Check the air/gas ratio control valve
for contamination.
Gas filter fitted.
Replace air/gas ratio control
valve.
B 8U 584 No diverter
module feedback
Diverter module does
not receive feedback
within the specified
time.
No feedback from external
components.
Power cable damaged or faulty.
Faulty external component.
Check flue gas damper or other
connected component.
Check diverter module.
Check the plug-in connection.
Replace power cable if
necessary.
Replace external component if
necessary.
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 installation of sensors.
Check resistance values of
temperature sensor against table.
Change configuration.
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 control unit.
V A01 808 Control device
receiving invalid
values from DHW
temperature
sensor
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.
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 control unit.
Type
1)
Fault
code
Sub
code
Cause Description Test procedure/Cause Action
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