Richmond
No Power / Control Board Not Energized
Richmond tankless water heater display is blank; unit does not power on at all.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Tripped breaker, Blown internal fuse, Loose power wiring, Failed main control board
How to Fix / Troubleshooting
Safety first: Turn OFF the breaker before opening the electrical junction box or control compartment.
- Check breaker: Verify that the circuit breaker feeding the heater is ON and not tripped. Reset if necessary.
- Inspect power wiring: Open the electrical junction box on the heater and confirm that line and neutral (or both hot legs for 240V) are securely connected.
- Check internal fuse: Many Richmond tankless units have an internal fuse on the control board. With power OFF, inspect and replace with the same type and rating if blown.
- Test voltage: With power ON (only if qualified), verify correct voltage at the heater terminals. If voltage is present but the display is dead, the control board or display module may need replacement.
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Repair Difficulty
Medium
3/5
Required Part
Main Control Board
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