Troubleshooting
6 720 800 531 (2011/09)
15
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 866-330-2729 or visit www.bosch-climate.us. Please have this guide with you when
you call.
6.1 For the Installer
6.2 For the User
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. 2). 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 866-
330-2729 www.bosch-climate.us
Water too cold -neon
light on.
Water flow too high for unit to control Adjust water flow to recommended flow rate.
One element is not working. Switch off the electricity and check the
resistance of the elements.
The power supply voltage has dropped. Check the supply voltage to the heater.
Temperature is turned too low. Ensure that the temperature dial is in the
correct position for the flow of water.
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 6
Symptom Cause What do do
Little or no water flows. The water supply is turned off. Turn on the main supply fully at the stop valve.
Cold water only -neon light
off.
The flow is not high enough to
activate.
Open the inlet service valve fully.
Cold water only -neon light
on.
The water flow rate is too high. Adjust the flow rate with hot water outlet
service valve.
The flow rate is correct Adjust the temperature dial on the front of the
cover.
The inlet water temperature has
dropped.
Adjust the flow rate with hot water outlet
service valve.
Water flow rate too low, or
temperature too high.
The hot tap is not fully open 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.
Table 7
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