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8.2 Thermal Cutout
The water heater is equipped with a thermal cutout (TCO) that is located above the
upper heating element in contact with the tank surface. If for any reason the water
temperature becomes excessively high, the TCO breaks the power circuit to the
water heater. Once the TCO activates, it must be reset manually.
WARNING
Personal injury, product damage, property damage, improper operation!
•
Resetting TCO - The cause of the high temperature condition must be
investigated by a qualified service technician and corrective action must
be taken before placing the water heater in service again.
To reset the TCO (Refer to Figure 20):
1.
Disconnect all power to unit.
2.
Remove the upper heating element cover and insulation.
3.
Press the button to reset, refer to below picture.
4.
Put back the insulation and screw on upper heating element cover before
turning on the power to the water heater.
Thermal cutout (TCO) location
Figure 21
Bosch GreenTronic 7000 T Hybrid Electric Water Heater - BTC 755003301 A (03.2024)
8.3 Electric Resistance Specifications
The water heater is equipped with multiple temperature sensors and heating
elements that are based on resistance values. The Electric Resistance Specification
table details the correct resistances for each heating element and temperature
sensor. These resistances are measured without the component being wired.
If the resistances vary from the specified values significantly at the specified
temperature, it could be a sign that a replacement component is required. Contact
a qualified technician for more information
Part
Electric Heating Element
T3
T4
TP
TH
T5L
T5U
Electrical resistance specifications
Table 24
Installation and Operating Instructions
Resistance Specifications (±5%)
12.8 Ohm
10 kOhm (at 25°C)
10 kOhm (at 25°C)
5 kOhm (at 90°C)
10 kOhm (at 10°C)
17.6 kOhm (at 50°C)
17.6 kOhm (at 50°C)
| 29
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