F6
Marey
Internal Control Board Fault / EEPROM Error
Marey electric tankless heater displays F6; unit may not power up correctly or may reset intermittently.
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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
Corrupted firmware, Failed control PCB, Power surge damage
How to Fix / Troubleshooting
Safety first: Turn OFF power at the breaker.
Steps:
- Power cycle: Leave the unit powered off for 10–15 minutes to allow capacitors to discharge, then restore power and test.
- Check for surge damage: Inspect the control board for burn marks or swollen components. If visible damage is present, the board must be replaced.
- Use surge protection: Consider installing a surge protector on the circuit feeding the heater to prevent future damage.
When to call a technician: Control board replacement and firmware issues should be handled by an authorized service provider.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board (Marey electric PCB)
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