Marey
Marey Water Heaters Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E0
Marey tankless water heater powers on but does not ignite; display shows E0 shortly after opening a hot water tap.
Water Flow Sensor / Flow Switch Fault
E1
Marey tankless water heater shows E1 and shuts down; burner does not stay lit or never ignites.
Ignition Failure / Flame Detection Fault
E2
Display shows E2 and the Marey water heater shuts off shortly after ignition or during operation.
Overheat Protection / High Temperature Limit Trip
E3
Marey tankless heater shows E3 and stops heating; fan may run briefly then shut down.
Exhaust / Flue Gas Sensor Fault or Venting Problem
E4
Display shows E4; water temperature fluctuates or unit shuts down intermittently.
Inlet / Outlet Temperature Sensor (NTC) Fault
E5
Marey heater displays E5 and stops heating; may occur when multiple fixtures are used.
Water Flow Rate / Flow Meter Error
E6
Display shows E6; unit may not modulate correctly or may shut down under load.
Fan Motor / Combustion Air Fault
E7
Marey heater shows E7; unit may not respond to temperature changes or may lock out.
Control Panel / Communication Error
E8
Display shows E8; heater may shut down or fail to modulate power correctly.
Gas Valve / Proportional Valve Fault
E9
Marey heater shows E9 and will not operate; may occur after a power surge or wiring change.
Power Supply / Voltage Error
F1
Marey electric tankless heater shows F1 and does not heat; water flows but remains cold.
Inlet Temperature Sensor Fault (Electric Model)
F2
Marey electric tankless heater displays F2; unit may overheat or shut down quickly.
Outlet Temperature Sensor Fault (Electric Model)
F3
Marey electric tankless heater shows F3; unit may not energize heating elements.
Flow Switch / Flow Sensor Fault (Electric Model)
F4
Marey electric tankless heater displays F4 and shuts down; may occur under high demand.
Overheat / High Limit Trip (Electric Model)
F5
Marey electric tankless heater shows F5; unit may partially heat or not heat at all.
Heating Element Circuit Fault
F6
Marey electric tankless heater displays F6; unit may not power up correctly or may reset intermittently.
Internal Control Board Fault / EEPROM Error
Symptom
Condensation or water droplets appear around the vent or top of a Marey gas tankless heater.
Condensation / Venting Moisture
Symptom
Marey heater cycles on and off rapidly when a small amount of hot water is used (e.g., handwashing).
Short Cycling at Low Flow
Symptom
Marey heater displays normal operation but hot water output is lukewarm or not hot enough.
Insufficient Heating / Underperformance
Symptom
Marey heater emits a burning smell or visible smoke during operation.
Overheating / Electrical or Combustion Issue
Symptom
Marey heater frequently locks out and requires manual reset even though no error code is displayed.
Intermittent Safety Trip / Control Lockout
Symptom
Marey heater produces a whistling or high-pitched noise during operation.
Flow-Induced Noise / Gas Flow Noise
Symptom
Marey heater produces water that is too hot even at low temperature settings.
Overheating / Temperature Control Failure
Symptom
Marey heater trips the circuit breaker when it starts or during operation (electric model).
Overcurrent / Short Circuit
Symptom
Marey heater vibrates excessively or rattles during operation.
Mechanical Vibration / Loose Components
Symptom
Marey heater’s digital display is blank or unreadable, but unit still heats water.
Display / User Interface Failure
Symptom
Marey heater’s fan continues to run for a long time after hot water is turned off (gas model).
Post-Purge Fan Overrun
Symptom
Marey heater’s hot water output smells like rotten eggs (sulfur odor).
Odor / Bacterial Contamination in Water Supply
Symptom
Marey heater’s hot water pressure is significantly lower than cold water pressure.
Restricted Flow Through Heater
Symptom
Marey heater’s temperature setting cannot be adjusted or buttons do not respond.
Keypad / Control Button Failure
Symptom
Marey tankless heater shuts off when another fixture is opened; water goes cold mid-use.
Flow Interruption / Demand Exceeds Capacity
Symptom
Marey water heater leaks water from the bottom of the unit.
Internal Water Leak
Symptom
Pilot will not stay lit on older Marey gas water heater models with standing pilot.
Pilot Flame / Thermocouple Failure
Symptom
Water flows but remains completely cold; Marey gas tankless heater shows normal display with no error code.
No Ignition / Burner Not Firing Without Error
Symptom
Water heater does not turn on at all; no lights or display on Marey tankless unit.
No Power / Dead Unit
Symptom
Water heater is making loud banging or knocking noises when running.
Water Hammer / Scale Boiling Noise
Symptom
Water temperature fluctuates between hot and cold during a shower on a Marey tankless heater.
Temperature Fluctuation / Inconsistent Heating
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E0 |
Marey tankless water heater powers on but does not ignite; display shows E0 shortly after opening a hot water tap.
|
Water Flow Sensor / Flow Switch Fault | View Details |
| E1 |
Marey tankless water heater shows E1 and shuts down; burner does not stay lit or never ignites.
|
Ignition Failure / Flame Detection Fault | View Details |
| E2 |
Display shows E2 and the Marey water heater shuts off shortly after ignition or during operation.
|
Overheat Protection / High Temperature Limit Trip | View Details |
| E3 |
Marey tankless heater shows E3 and stops heating; fan may run briefly then shut down.
|
Exhaust / Flue Gas Sensor Fault or Venting Problem | View Details |
| E4 |
Display shows E4; water temperature fluctuates or unit shuts down intermittently.
|
Inlet / Outlet Temperature Sensor (NTC) Fault | View Details |
| E5 |
Marey heater displays E5 and stops heating; may occur when multiple fixtures are used.
|
Water Flow Rate / Flow Meter Error | View Details |
| E6 |
Display shows E6; unit may not modulate correctly or may shut down under load.
|
Fan Motor / Combustion Air Fault | View Details |
| E7 |
Marey heater shows E7; unit may not respond to temperature changes or may lock out.
|
Control Panel / Communication Error | View Details |
| E8 |
Display shows E8; heater may shut down or fail to modulate power correctly.
|
Gas Valve / Proportional Valve Fault | View Details |
| E9 |
Marey heater shows E9 and will not operate; may occur after a power surge or wiring change.
|
Power Supply / Voltage Error | View Details |
| F1 |
Marey electric tankless heater shows F1 and does not heat; water flows but remains cold.
|
Inlet Temperature Sensor Fault (Electric Model) | View Details |
| F2 |
Marey electric tankless heater displays F2; unit may overheat or shut down quickly.
|
Outlet Temperature Sensor Fault (Electric Model) | View Details |
| F3 |
Marey electric tankless heater shows F3; unit may not energize heating elements.
|
Flow Switch / Flow Sensor Fault (Electric Model) | View Details |
| F4 |
Marey electric tankless heater displays F4 and shuts down; may occur under high demand.
|
Overheat / High Limit Trip (Electric Model) | View Details |
| F5 |
Marey electric tankless heater shows F5; unit may partially heat or not heat at all.
|
Heating Element Circuit Fault | View Details |
| F6 |
Marey electric tankless heater displays F6; unit may not power up correctly or may reset intermittently.
|
Internal Control Board Fault / EEPROM Error | View Details |
| – |
Condensation or water droplets appear around the vent or top of a Marey gas tankless heater.
|
Condensation / Venting Moisture | View Details |
| – |
Marey heater cycles on and off rapidly when a small amount of hot water is used (e.g., handwashing).
|
Short Cycling at Low Flow | View Details |
| – |
Marey heater displays normal operation but hot water output is lukewarm or not hot enough.
|
Insufficient Heating / Underperformance | View Details |
| – |
Marey heater emits a burning smell or visible smoke during operation.
|
Overheating / Electrical or Combustion Issue | View Details |
| – |
Marey heater frequently locks out and requires manual reset even though no error code is displayed.
|
Intermittent Safety Trip / Control Lockout | View Details |
| – |
Marey heater produces a whistling or high-pitched noise during operation.
|
Flow-Induced Noise / Gas Flow Noise | View Details |
| – |
Marey heater produces water that is too hot even at low temperature settings.
|
Overheating / Temperature Control Failure | View Details |
| – |
Marey heater trips the circuit breaker when it starts or during operation (electric model).
|
Overcurrent / Short Circuit | View Details |
| – |
Marey heater vibrates excessively or rattles during operation.
|
Mechanical Vibration / Loose Components | View Details |
| – |
Marey heater’s digital display is blank or unreadable, but unit still heats water.
|
Display / User Interface Failure | View Details |
| – |
Marey heater’s fan continues to run for a long time after hot water is turned off (gas model).
|
Post-Purge Fan Overrun | View Details |
| – |
Marey heater’s hot water output smells like rotten eggs (sulfur odor).
|
Odor / Bacterial Contamination in Water Supply | View Details |
| – |
Marey heater’s hot water pressure is significantly lower than cold water pressure.
|
Restricted Flow Through Heater | View Details |
| – |
Marey heater’s temperature setting cannot be adjusted or buttons do not respond.
|
Keypad / Control Button Failure | View Details |
| – |
Marey tankless heater shuts off when another fixture is opened; water goes cold mid-use.
|
Flow Interruption / Demand Exceeds Capacity | View Details |
| – |
Marey water heater leaks water from the bottom of the unit.
|
Internal Water Leak | View Details |
| – |
Pilot will not stay lit on older Marey gas water heater models with standing pilot.
|
Pilot Flame / Thermocouple Failure | View Details |
| – |
Water flows but remains completely cold; Marey gas tankless heater shows normal display with no error code.
|
No Ignition / Burner Not Firing Without Error | View Details |
| – |
Water heater does not turn on at all; no lights or display on Marey tankless unit.
|
No Power / Dead Unit | View Details |
| – |
Water heater is making loud banging or knocking noises when running.
|
Water Hammer / Scale Boiling Noise | View Details |
| – |
Water temperature fluctuates between hot and cold during a shower on a Marey tankless heater.
|
Temperature Fluctuation / Inconsistent Heating | View Details |
No matching codes found
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