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Troubleshooting; For The Installer - Bosch US3 Installation Manual And Operating Instructions

Electric water heaters
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US
6

Troubleshooting

WARNING: Always switch off the electricity
supply to the unit before you remove the
cover.
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

Symptom
Cold water only -neon light
off.
Water too cold -neon light
on.
Water flow too low, or
temperature too high.
Table 7
Cause
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
dropped.
There are restrictions in the
plumbing.
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-
798-8161 www.bosch-climate.us
Adjust water flow (see Table 4).
Change the power select screw to "HI", see
Fig. 5.
Switch off the electricity and check the
resistance of the elements (see Table 4).
Check the supply voltage to the heater (see
Table 4).
Check the plumbing. Only use Teflon tape for
sealing pipe joints.
Troubleshooting | 15
6 720 647 005 (2011/09)

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