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Installation Manual
Bosch Tronic 6100 C Electric Tankless Water Heaters - BTC 724001301 A (08.2022)
12 Troubleshooting
Before calling for service check the troubleshooting list of common issues. This can
save time and cost. If you are unable to resolve a problem contact your installer or
Customer Service for support (Phone: 1-866-642-3198).
Alternatively, please visit our Service & Support webpage to fi nd FAQs, videos,
service bulletins, and more;
www.boschheatingcooling.com/service or use your
cellphone to scan the code below.
Problem Possible Causes Solution
No hot water
Power outage or faulty wiring
Check the power supply. Check the circuit breakers
Ensure the breakers at main electrical panel are ON. A breaker may be
faulty or the unit may be wired incorrectly
Ensure the shutoff valve on the unit’s incoming water supply line is fully
open
The fl ow rate needed to activate the heating element (0.5 gpm) has not
been reached
Increase the fl ow rate from the water supply source
Clean the fi lter screen on the unit’s water inlet
The high limit has tripped Refer to Section 12.1 High Limit Switch
Unit is powered off Refer to Section 9 to power on the unit
Water
Not Hot
Enough
Too much water fl owing through the heater
Reduce the fl ow rate at the faucet or slightly close the shutoff valve on
the unit’s incoming water supply line to reduce fl ow rate
Voltage less than 240 volts
This water heater is designed to operate on 240 volts. A lower voltage
will produce less heating power. It may be necessary to upgrade to a
larger input heater
Ensure the breakers at main electrical panel are ON. A breaker
may be faulty or the unit may be wired incorrectly
Crossed wires.
Ensure the breakers at main electrical panel are ON. A breaker
may be faulty or the unit may be wired incorrectly
Reduction in the seasonal inlet water temperature or temperature
setting is too low
Increase the temperature setting on the unit or reduce the fl ow rate
Water pressure less than 7 psi (0.5 bar)
Make sure the shutoff valve is fully open and the water supply line is
not blocked
Cold water is mixing in before the faucet
An anti-scald feature may be installed on the faucet that is mixing
cold water creating a plumbing crossover. These types of features can
usually be adjusted to reduce the amount of cold water mixed
Thermal loss due to long pipe run
As hot water runs through the system to the faucet some heat will
be lost, especially if it has a long distance to travel or the pipes are
cold. This is normal and can be compensated for by increasing the
temperature setting and insulating the pipes
Failed heating element Test the heating element according to Section 12.3
Electrical malfunction
Contact a qualifi ed electrician or your local authorized distributor for
service
Table 7
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.
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