Bosch Condens 7000 FP - Emergency Operation; Resetting Faults in Emergency Mode

Emergency operation
Condens 7000 FP – 6721846699 (2022/12)
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 Read the measured value at partial load and full load and when the
burner is switched off and enter in the inspection and maintenance
record (Chapter 17.7, page 73).
ionisation current when the burner is running:
• ≥ 10 A = OK
• < 10 A = fault.
Ionisation current when the burner is switched off:
• < 10 A = OK
• ≥ 10 A = fault.
11.15 Completing inspection and maintenance
11.15.1 Removing measuring devices
Observe corresponding technical documentation for the control unit and
user interface.
11.15.2 Installing casing parts
 Fit all casing sections ( Fig. 39, page 32).
11.15.3 Checking the gas/air ratio
 Measure carbon dioxide content ( Chapter 11.6, page 39).
11.15.4 Confirming inspection and maintenance
 Sign the inspection and maintenance protocol in this manual
( Chapter 17.7).
12 Emergency operation
The burner control unit automatically goes to emergency operation, if
the communication with the control unit is interrupted.
During emergency operation, the burner control unit regulates the boiler
temperature at 60 °C to's maintain the operation of the heating system
until communication has been restored.
12.1 Resetting faults in emergency mode
Observe corresponding technical documentation for the control unit and
user interface.
Emergency mode of the burner control unit is only possible in
conjunction with a MX25 controller without UM10.
When using a CC83xx, emergency mode of the burner control unit is not
possible!
In emergency operation, faults can only be cleared via the reset button
on the burner control unit. Resetting is only possible if a locking fault is
present.
 Press the reset button to clear the fault.
Fig. 79 Clearing a fault on the burner control unit
[1] Reset button
13 Troubleshooting
DANGER
Risk to life through poisoning!
 Check for leaks after working on flue gas-carrying components.
DANGER
Danger to life due to electrical shock!
 Before carrying out work on electrical components, isolate them from
the power supply (230 V AC) (fuse, circuit breaker) and secure
against unintentional reconnection.
WARNING
Risk of scalding!
Hot water can lead to severe scalding.
 Close all valves and possibly drain device prior to working on parts
routing water.
NOTICE
Material damage due to water leaks!
Water leaks can damage the MX25 control unit.
 Cover the MX25 control unit before carrying out work on water-
carrying components.
6 720 801 303-02.2T
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