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Troubleshooting | 15US
6 720 647 005 (2011/09)
6 Troubleshooting
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
you call.
6.1 For the Installer
WARNING: Always switch off the electricity
supply to the unit before you remove the
cover.
Symptom Cause What do do
Cold water only -neon light
off.
Electricity not on. Check electrical supply.
The water supply is connected to
the OUTLET of the unit.
Reconnect the water supply to the INLET
(marked in blue).
The high temperature thermal cut
out has tripped.
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.
The flow switch is not working. Turn off the power and observe if the flow
switch activates when the water is turned on.
If not contact Bosch Thermotechnology 800-
798-8161 www.bosch-climate.us
Water too cold -neon light
on.
Water flow too high. Adjust water flow (see Table 4).
The power selector screw not all
the way to “HI”.
Change the power select screw to “HI”, see
Fig. 5.
One element is not working. Switch off the electricity and check the
resistance of the elements (see Table 4).
The power supply voltage has
dropped.
Check the supply voltage to the heater (see
Table 4).
Water flow too low, or
temperature too high.
There are restrictions in the
plumbing.
Check the plumbing. Only use Teflon tape for
sealing pipe joints.
Table 7
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