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Problems - Bosch Therm 4000 S Installation And Operating Manual

Gas instantaneous water heaters
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9

Problems

Fitting, maintenance and repair must only be carried out by qualified contractors. The following table describes the solutions for
possible problems (solutions followed by * must only be carried out by qualified contractors).
Display
Description
A0
Cold and hot water temperature sensor damaged.
A1
Temperature inside the box very high (external
temperature too high, combustion chamber
calcified).
A4
Air temperature sensor of the box faulty.
A7
Hot water temperature sensor faulty.
A9
Hot water temperature sensor is not fitted properly.
Incoming gas pressure low.
C7
Fan not working.
CA
Water flow above maximum value specified.
CF
Blockage of gases coming out of the combustion.
C1
Air flow sufficient for start-up.
E0
Breakdown in the electrical box
E1
Hot water temperature sensor detects overheating.
E2
Cold water temperature sensor faulty.
E4
Hot water temperature sensor detects overheating
(leaking combustion products inside the combustion
chamber).
E9
Thermofuse.
EA
Flame not detected.
EE
Modulating Solenoid valve disconnected.
EF
Wrong gas connection.
F7
A flame is detected although the appliance is
switched off.
Table 11
Therm 4000 S
Solution
▶ Check temperature sensor and associated
1)
connections.
▶ Call a qualified contractor.
The appliance automatically regulates the
performance of the appliance to avoid
overheating.
▶ Check temperature sensor and associated
1)
connections.
▶ Check temperature sensor and associated
1)
connections.
▶ Check fitting.
▶ Check incoming pressure.
▶ Check fan connections.
▶ Close and open a hot water tap.
▶ Check water filter.
▶ Remove dirt or any other impediment in the
flue/intake pipe.
▶ Close and open a hot water tap.
If the problem persists, call a qualified contractor.
▶ Press the reset button.
If the problem persists, call a qualified contractor.
▶ Let the appliance cool and try again.
If the problem persists, call a qualified contractor.
▶ Check sensor and associated connections.
▶ Disconnect the appliance.
▶ Call a qualified contractor.
▶ Call a qualified contractor.
▶ Check the pressure of the gas supply to the
mains connection, the ignition electrode and
the ionisation electrode.
▶ Press the reset button.
1)
▶ Check connections.
Natural gas appliance supplied with liquid gas.
▶ Check the electrodes and the cable.
▶ Check the printed circuit board.
▶ Press the reset button.
6 720 819 528 (2016/02)
Problems | 21
1)
1)
1)

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