Bosch Condens 7000 FP - Page 63

Operating and fault displays
63
Condens 7000 FP – 6721846699 (2022/12)
V CY 573 Flow temperature
<-5°C
(interruption)
Control unit is receiving
implausible values from
flow temperature
sensor
Check the connecting lead between
the burner control unit and the flow
temperature sensor.
 Replace the connecting lead if
necessary.
Check the electrical connection of
the connecting lead at the burner
control unit and the flow
temperature sensor.
 If necessary, eliminate the
contact problem.
Check resistance values of
temperature sensor against table.
 Replace the temperature sensor
if necessary.
Burner control unit defective.  If the connecting lead, contacts
and resistance values are all OK,
replace the burner control unit.
V CY 574 Flow temperature
> 130 °C (short-
circuit)
Control unit is receiving
implausible values from
flow temperature
sensor
Check the connecting lead between
the burner control unit and the flow
temperature sensor.
 Replace the connecting lead if
necessary.
Check the electrical connection of
the connecting lead at the burner
control unit and the flow
temperature sensor.
 If necessary, eliminate the
contact problem.
Check resistance values of
temperature sensor against table.
Replace the temperature sensor if
necessary.
Burner control unit defective.  Replace the temperature sensor
if necessary.
 If the connecting lead, contacts
and resistance values are all OK,
replace the burner control unit.
V EE 601 Boiler water
temperature
sensor reading
(twin sensors).
Successive
measurements of the
boiler temperature are
too widely divergent.
Check the cable running to the boiler
water temperature sensor and the
contacts at the burner control unit
and pressure sensor.
Check plug-in connector.
Replace if damaged.
 Clean if dirty or replace if
necessary.
 Reconnect any loose plugs.
Check sensor readings against table.  Replace temperature sensor if
there are discrepancies.
Burner control unit defective.  If the connecting lead, contacts
and resistance values are all OK,
replace the burner control unit.
V EE 612 Readings of the
return
temperature
sensor
Successive return
temperature readings
are too widely
divergent.
Check the cable running to the return
temperature sensor and the
contacts.
Check plug-in connector.
Replace if damaged.
 Clean if dirty or replace if
necessary.
 Reconnect any loose plugs.
Check sensor readings against table.  Replace temperature sensor if
there are discrepancies.
Burner control unit defective.  If the connecting lead, contacts
and resistance values are all OK,
replace the burner control unit.
V EE 613 Flow temperature
sensor
reading
Successive flow
temperature readings
are too widely
divergent.
Check the cable running to the flow
temperature sensor and the
contacts.
Check plug-in connector.
Replace if damaged.
 Clean if dirty or replace if
necessary.
 Reconnect any loose plugs.
Check sensor readings against table.  Replace temperature sensor if
there are discrepancies.
Burner control unit defective.  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