WARNING: Always switch off the electricity
supply to the unit before you remove the
If the problem persists:
The person who initially installed the unit is probably the best one to contact for help. You can also call Bosch
Thermotechnology Corporation at 800-798-8161 or visit www.bosch-climate.us. Please have this guide with you when
For the Installer
Cold water only -neon light
Water too cold -neon light
Water flow too low, or
temperature too high.
Electricity not on.
The water supply is connected to
the OUTLET of the unit.
The high temperature thermal cut
out has tripped.
The flow switch is not working.
Water flow too high.
The power selector screw not all
the way to "HI".
One element is not working.
The power supply voltage has
There are restrictions in the
What do do
Check electrical supply.
Reconnect the water supply to the INLET
(marked in blue).
Reset it by opening the unit and pushing the
button on the cut out (Fig. 3). Before you do
this you must find the cause of the problem.
Turn off the power and observe if the flow
switch activates when the water is turned on.
If not contact Bosch Thermotechnology 800-
Adjust water flow (see Table 4).
Change the power select screw to "HI", see
Switch off the electricity and check the
resistance of the elements (see Table 4).
Check the supply voltage to the heater (see
Check the plumbing. Only use Teflon tape for
sealing pipe joints.
Troubleshooting | 15
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