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For Your Safety Read Before Operating Your; Water Heater; Power; Error Code Reset - Bosch Greentherm T9900 SE 160 Installation And Operating Instructions Manual

Indoor residential tankless water heaters, 160 000/199 000 btu- natural gas 160 000/199 000 btu - liquefied petroleum lp gas
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For your safety read before operating your

water heater

Explosion hazard!
▶ If you do not follow these instructions exactly, a fire or
explosion may result causing property damage, personal
injury or loss of life.
Appliance malfunction!
Strong magnetic fields can interfere with the electronics, which
can lead to appliance malfunction.
▶ Do not attach magnets to this water heater, do not install
near strong magnetic fields.
A. This appliance is equipped with electronic ignition for
lighting the main burner. When turning the heater on, follow
these instructions exactly.
▶ Turn off the gas shut-off valve.
▶ Open windows and doors.
▶ Do not try to ignite the appliance.
▶ Do not touch any electrical switch, telephone, and do not
use outlets.
▶ Extinguish all open flames. Do not smoke! Do not use
▶ Warn all occupants of the building. Do not ring doorbells!
▶ If you can hear gas leaking, leave the building immediately.
▶ Prevent others from entering the building and notify the
police and fire department from outside the building.
▶ From outside the building, call the gas utility company and
a trained and certified installer.
B. Use only your hand to press the on/off control button. Never
use tools. If the touch control display is dirty, wipe down with a
damp cloth. Forceful repair may result in a fire or explosion.
C. Do not use this appliance if any part has been under water.
Immediately call a qualified service technician to inspect the
appliance and to replace any part of the control system and any
gas control which has been under water.


To turn ON the appliance;
Greentherm T9900 SE/i – 6 720 813 635 (2019/03)
▶ Touch and hold symbol
The LCD display shows the selected temperature.
When the burner is on, the display shows symbol
(Fig. 39, [7]).
Fig. 40
To shut down the appliance;
▶ Touch and hold symbol

Error code reset

Some possible faults can be solved by reset the appliance.
To remove error code from the display,
▶ Touch and hold symbol
The appliance will initiate the start up sequence.
Appliance malfunction!
▶ If the problem persists, contact your installer.

Temperature selection

To select a hot water temperature:
▶ Touch the symbol
temperature is displayed.
Fig. 41
Operation instructions
for more than 3 sec.
for more than 3 sec.
for more than 3sec.
until the desired



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This manual is also suitable for:

Greentherm t9900 se 199Greentherm t9900 se/i 199