Thermal Cutout - Bosch TRONIC 4000 C Installation Manual

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WARNING: SCALD HAZARD
 The risk of scald injury increases as you increase water
temperature. A lower setting is more economical and
reduces the risk of scalding. Use a water tempering or
mixing valve and extreme caution when using hot water to
avoid scald injury. Consult codes for conformance. Failure
to follow the instructions in this warning statement could
result in serious personal injury or death from scalds.
NOTICE: PRODUCT DAMAGE
 If draining of the water heater is necessary, open the T&P
valve or a hot water tap to prevent vacuum buildup in the
tank and piping.

12.1 Thermal Cutout

Occasionally, the thermal cutouts may trip, resulting in power being shut down as
a safety precaution. This can happen if the water temperature exceeds a certain
temperature.
If a thermal cutout continues to trip, the power setting might be too high or the fl ow
too low. Adjust the power selector and/or the fl ow.
For the water heater to be put back into operation, the tripped thermal cutout will
need to be reset. The reset method will depend on which type of switch as tripped:
1. Shut off the circuit breaker and remove the front cover.
WARNING: ELECTRICAL HAZARD
 Failure to disconnect the power from the water heater
before attempting to install or repair it will result in property
damage, severe personal injury, or death.
2. If the thermal cutout has a button in the center of it; This is a manual thermal
cutout.
To reset, press the reset button. If you hear a click, then this thermal cutout
was tripped and you have now reset it. Turn the circuit breakers back on and
run a hot water faucet to test that the water heater activates.
Figure 19
Bosch Tronic TR4000C Electric Tankless Water Heaters- BTC 722203301 A (08.2022)
3. If the thermal cutout has NO button on it; this is a thermal cutout with an
automatic-reset function. Once the overheat condition has ended, this type
of thermal cutout will reset itself. Open the hot water faucet and allow about
one minute for the cutout to reset. If the thermal cutout has not reset itself, it
may be necessary to test it for failure.
4. To test a thermal cutout for failure, please do the following:
a. First, ensure that all circuit breakers that supply the water heater are
turned OFF.
b. Use a multimeter to test for continuity across the cooled thermal
cutout. If you have continuity, the switch has reset and power will fl ow
across it. If you have no continuity across the thermal cutout and it is
cool to the touch, it may have failed and will require replacement.
Figure 20 Reset Locations
CAUTION: PRODUCT DAMAGE, PROPERTY DAMAGE
 Call a technician if the high limit needs to be reset
frequently.
Installation Manual
Thermal
Cutout
(with Auto
Reset)
Thermal
Cutout
(with Manual
Reset)
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