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8 Troubleshooting
Problem
Possible Cause
No power to the water heater
No power to the display
Display is not powered
TCO tripped
Board failure
No power
Vacation mode is active
No hot water
Error Code
Water heater has not recovered
Plumbing Issues
Wrong operation mode selected
Setpoint temperature too low
Demand response is active
Running out of hot water
Water heater is undersized
Setpoint temperature too high
Temperature too high
Plumbing Issues
Water pressure too low
Plumbing Issues
Smelly water
Water quality issue (e.g. excessive sulfate)
Leak from drain valve
Leak from water connections or condensate drain
Water in drain pan
Leak from T&P valve
Leak from tank
Table 22
Bosch GreenTronic 7000 T Hybrid Electric Water Heater - BTC 755003301 A (03.2024)
Corrective Action
1. Check for tripped breaker, restore power
2. Check voltage at terminal block (~208-240V)
1. Check connection on main board to display
2. Check if display connection has power
3. If power from mainboard connection is available, replace display board
1. Understand cause of TCO activation
2. Reset TCO
Replace failed board
1. Check for tripped breaker, restore power
2. Check voltage at terminal block (~208-240V)
3. Check if display has power, if not see above
1. Check operation mode on display for VACATION
2. Change to desired mode
1. Error code is displayed
2.Check error code table and follow corrective actions
1. Check current temperature on display
2. Change operation to mode with higher recovery rate, refer to section "Selecting Operation Mode"
Check for plumbing issues (e.g. crossover, bad mixing valve, etc.)
Select mode with higher recovery rate
Raise setpoint, refer to section "Water Temperature Setting"
Check if DR is activated, refer to section "Demand Response"
1. Stagger hot water usage
2. Check with your installer
Lower setpoint
Check for plumbing issues (e.g. crossover, bad mixing valve, etc.)
Check for plumbing issues (e.g. closed cold water supply valve)
Consider using an alumnium anode rod (part number: 7738007481 for 50 Gallon, 7738007482
for 80 Gallon)
1. Verify drain valve is fully closed
2. Replace if it still leaks
1. Check for leaks
2. Tighten connections
3. Replace if necessary
1. Check for leak at T&P valve
2. Replace T&P valve
Inspect tank for leakage, and replace whole unit if necessary
Installation and Operating Instructions
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