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Installation Manual
Bosch Tronic 6100 C Electric Tankless Water Heaters- BTC 724001301 A (08.2022)
12.3 Testing the Heating Element
To Test Heating Element:
1. Verify that circuit breakers are off and there is no voltage at the unit.
2. Disconnect wires from the heating element. It is recommended to mark or
take a picture of wire positions for reinstallation.
3. Using a 200 ohm range on a digital multi-meter, measure resistance (ohms)
across the wire connections on the base of each heating element canister.
Ensure multi-meter probes are under insulation sheathing and making good
contact. Test points are as follows:
A+ to A-
B+ to B-
C+ to C-
Figure 33
C- B-
A-
A+
B+
C+
Heating Element Test Points TR6100C-18 TR6100C-27
A+ to A- 19.2 ± 1.0 ohms 12.8 ± 0.7 ohms
B+ to B- 19.2 ± 1.0 ohms 12.8 ± 0.7 ohms
C+ to C- 19.2 ± 1.0 ohms 12.8 ± 0.7 ohms
Table 9
4. If an element tests bad, it must be replaced following the procedure in
Section 11.4.
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