Troubleshooting; Possible Faults - Bosch TRONIC 3000 US3-2R Installation Manual And Operating Instructions

6

Troubleshooting

DANGER:
Risk of electric shock!
▶ Always switch off the electrical supply to the unit before you
remove the cover.
6.1

Possible faults

Symptom Cause
Water flow too high
The power selector screw
not all the way to "HI".
Water too cold -
neon light on.
One element is not working.
The power supply voltage
has dropped.
Cold water only - Cut-out has operated.
neon light off.
Water flow too
There are restrictions in the
low, or tempera-
plumbing.
ture too high.
Little or no water The water supply is turned
flows. off.
Cold water only - The flow is not high enough
neon light off. to activate.
Water too cold - The water flow rate is too
neon light on. high.
The inlet water temperature
has dropped.
The main supply of water
Water flow rate
flow is too low.
too low, or tempe-
rature too high.
The hot tap is not fully open.
Fluctuating water pressure
Water
and/or flow is causing the
temperature
flow switch to cycle on and
fluctuates.
off.
1) Only to be carried out by qualified contractors.
Table 7
Tronic 3000 – 6 721 803 545 (2020/02)
What to do
Adjust water flow (see Table 3).
Change the power select screw to "HI" ( Fig. 11).
Switch off the electricity and check the resistance of the elements (
1)
Table 3).
Check the supply voltage to the heater ( Table 3).
Switch off the electricity. Identify and fix the cause of the cut-out operation and
then reset the cut-out ( Fig. 14).
1)
Check the plumbing.
Check that outlet restrictors and aerators on showers and/or faucets are clear.
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 flow rate with hot water outlet service valve.
Increase the water flow.
Adjust the stop/ball valve so that water is at the right temperature with the tap
fully open (see section 5.1). Always turn the hot tap full on.
Increase the flow rate.
Be sure that the isolation valves are properly adjusted.
Be sure that the outlet restrictors and aerators on showers and/or faucets are
clear.
Be sure that there is no plumbing crossover by shutting off the inlet isolation
valve and opening all hot water outlets served by the Tronic 3000. If there is a
steady flow, then cold water is flowing into hot water service lines and back-
pressuring the Tronic 3000. This condition must be fixed or the heater will not
work properly.
1)
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Troubleshooting
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