Bosch Condens 7000 F Installation And Maintenance Instructions For The Contractor page 52

Operating and fault displays
1)
Type Error Sub- Cause
code code
V CY 566 Return
temperature < -5
°C (interruption)
V CY 567 Return
temperature
> 130 °C (short
circuit)
V CY 573 Supply
temperature
< -5 °C (circuit
break)
V CY 574 Supply
temperature
> 130 °C (short-
circuit)
V EE 601 Boiler water
temperature
sensor reading
(twin sensors).
52
Description Test procedure/Cause
The control unit is Check the connecting lead between
receiving implausible the burner control unit and the return
values from the return temperature sensor.
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.
The control unit is Check the connecting lead between
receiving implausible the burner control unit and the return
values from the return temperature sensor.
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.
Control unit is receiving Check the connecting lead between
implausible values from the burner control unit and the flow
flow temperature sensor temperature sensor.
Check the electrical connection of
the connecting lead at the burner
control unit and the flow
temperature sensor.
Check resistance values of
temperature sensor against table.
Burner control unit defective.
Control unit is receiving Check the connecting lead between
implausible values from the burner control unit and the flow
flow temperature sensor temperature sensor.
Check the electrical connection of
the connecting lead at the burner
control unit and the flow
temperature sensor.
Check resistance values of
temperature sensor against table.
Burner control unit defective.
Successive measurements Check the cable running to the boiler
of the boiler temperature water temperature sensor and the
are too widely divergent. contacts at the burner control unit
and pressure sensor.
Check plug-in connector.
Check sensor readings against table. ▶ Replace temperature sensor if there
Burner control unit defective.
Action
▶ 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.
▶ 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.
▶ 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.
▶ Replace the connecting lead if
necessary.
▶ Eliminate the contact problem if
necessary.
Replace the temperature sensor if
necessary.
▶ Replace the temperature sensor if
necessary.
▶ If the connecting lead, contacts and
resistance values are all OK, replace
the burner control unit.
▶ Replace if damaged.
▶ Clean if dirty or replace if necessary.
▶ Reconnect any loose plugs.
are discrepancies.
▶ If the connecting lead, contacts and
resistance values are all OK, replace
the burner control unit.
Condens 7000 F – 6720871560 (2019/11)