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Installation Manual
Bosch Tronic TR4000C Electric Tankless Water Heaters - BTC 722203301 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.
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.
Problem Possible Causes Solution
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
Temperature setting is too low Increase the temperature setting on the unit, see Section 9
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
Heating element failure Test element continuity, see Section 12.2.
Electrical malfunction Contact a qualifi ed electrician or your installer for service
Water Too Hot
Not enough water fl owing through the heater
Increase the fl ow rate at the water outlet. If fl ow does not
increase, clean and inspect the water heater inlet fi lter and
faucet aerators/showerheads
Temperature setting is too high Switch to a lower temperature setting, see Section 9
Pre-heated water supply Ensure the heater is connected to a cold water supply
Heater Shuts Off
During Use
Power outage or faulty wiring
Check the power supply and circuit breaker. If problem
persists, contact a qualifi ed electrician
Water Stops Flowing
Blockage in water pipes or hoses
Ensure the main water shutoff valve is fully open
and there are no obstructions in the water supply line
Blockage in cold water inlet
Remove check valve and inlet fi lter on the cold water inlet and
ensure there are no obstructions. See section 11.3
No water supply
Ensure the main water shutoff valve is fully open
and there are no obstructions in the water supply line
Water Temperature Varies from
Hot to Cold During Use
Water pressure has dropped below minimum level or fl ow is not
stable.
Increase the fl ow rate from the water supply source. Check for
plumbing crossover or other water supply issues.
No Hot Water
Power outage or faulty wiring Check the power supply and circuit breaker
The fl ow rate needed to activate the heating element
(0.55 gpm) has not been reached.
Ensure shutoff valve to the water heater is fully open. Increase
the fl ow rate from the water supply source
Clean the fi lter screen on the unit’s cold water inlet. See section
11.3
High Limit Has Been Tripped
Check that the high limit reset buttons are pushed in. Follow
steps to reset the switch in this manual, section 12.1.
Leaks
Check for leaks at fi ttings
Check water fi ttings. Remove front cover and inspect heating
element gasket
If tank is leaking
Turn off water supply at the shutoff valve. Shut off power to the
water heater, and review warranty to see if heater is still within
warranty period
Table 8
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.
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