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Installation Manual
Bosch Tronic 6100 C Electric Tankless Water Heaters - BTC 724001301 A (08.2022)
12.4 Testing / Changing a Triac
A failed triac might cause overheating or irregular heating or no heating at all. If all
other troubleshooting steps mentioned above do not reveal the problem, follow
below instructions to test the triacs.
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.
1. Shut off the power supply to the water heater.
2. Remove the front cover per the instructions in Section 11.1 or damage may
occur.
3. Remove the three screws holding the internal protective cover.
Figure 34
1
4. Locate the triacs
Figure 35
To Test Triac:
1. Measure resistance (Ω) across terminals as shown below
Figure 36
A1
A2
G
Test Points Proper Reading
A1 to A2 Open Circuit
G to A1 Continuity
Table 10
To Change Triac:
1. Ensure the power supply is turned off .
2. Take a phote of triac wiring for reinstallation. Disconnect the three (3) wire
connectors on the triac. Remove the wires.
Figure 37
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