Bosch Powerstar AE 115 Instructions D'installation Et D'utilisation page 22

Troubleshooting
Cold water only – Neon light off
The inlet water temperature
is too cold
One of the power supplies
is not on
Premature element failure
Tab. 10
Water not hot enough - Neon light on
The water supply is
connected to the outlet of
the unit
One or more of the heating
module thermal cut-outs has
tripped
Temperature dial is turned
too low
Water flow is too high
Tab. 11
22
Verify the heater is sized appropriately for it's geographic location. Turn
temperature knob located on the bottom of the water all the way clockwise for
maximum temperature setting. Ensure flow rates are within the heater's
specifications. Refer to Fig. 11 on page 17 of the manual. Use of an isolation valve
on the hot water outlet to control flow rate is recommended.
Have a licensed electrician verify adequate voltage on the terminal block inside the
water heater. Verify circuit breakers serving the heater are not tripped. See the
"Electrical connections" section on page 13 of this manual.
Shut off power to the unit and remove cover. Use an ohmmeter to verify correct
resistance on each element. If readings are different than listed specifications on
page 20, contact Technical Support 866-330-2729 for further instruction.
Verify plumbing connections are correct (See Fig. 2). Reconnect the water supply
to the inlet of the unit (marked blue).
Turn off the power to the heater, remove the cover and locate the thermal cutouts
on the top of each heating module. Check for continuity through each cutout.
(Less than 0.5 Ohms). A continuity value greater than 0.5 Ohms indicates that the
cutout has tripped or is faulty. A cutout will only trip in exceptional circumstances
and it is essential that the cause is determined and resolved. Verify the heater's
inlet filter screen and all outlets served by the heater are clear of debris. Ensure
the heater is not being fed preheated water. This water heater is designed for
cold water feed only.
Contact Technical Support 866-330-2729 for further instructions.
Turn the temperature dial located on the bottom of the water heater clockwise for
hotter temperatures. Refer to Fig. 11 for outlet temperature vs. flow rate variance.
Adjust water flow to stay within the water heater's specifications. See Fig. 11 of
this manual.
6 720 800 414 (2011/09)