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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 866-330-2729 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 6
6.2
For the User
Symptom
Little or no water flows.
Cold water only -neon light
off.
Cold water only -neon light
on.
Water flow rate too low, or
temperature too high.
Table 7
6 720 800 531 (2011/09)
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 for unit to control
One element is not working.
The power supply voltage has dropped.
Temperature is turned too low.
There are restrictions in the plumbing.
Cause
The water supply is turned off.
The flow is not high enough to
activate.
The water flow rate is too high.
The flow rate is correct
The inlet water temperature has
dropped.
The hot tap is not fully open
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. 2). 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 866-
330-2729 www.bosch-climate.us
Adjust water flow to recommended flow rate.
Switch off the electricity and check the
resistance of the elements.
Check the supply voltage to the heater.
Ensure that the temperature dial is in the
correct position for the flow of water.
Check the plumbing. Only use Teflon tape for
sealing pipe joints.
What do do
Turn on the main supply fully at the stop valve.
Open the inlet service valve fully.
Adjust the flow rate with hot water outlet
service valve.
Adjust the temperature dial on the front of the
cover.
Adjust the flow rate with hot water outlet
service valve.
Adjust the stop/ball valve so that water is at the
right temperature with the tap fully open.
Always turn the hot tap fully on.
Troubleshooting
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