
Operating and fault displays
Condens 7000 F – 6720871560 (2019/11)
52
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.
▶ 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 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.
▶ 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 burner control unit.
V
CY
573 Supply
temperature
< -5 °C (circuit
break)
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.
▶ Eliminate the contact problem if
necessary.
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 Supply
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.
▶ Eliminate the contact problem if
necessary.
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.
Type
1)
Error
code
Sub-
code
Cause
Description
Test procedure/Cause
Action