Eemax
Eemax 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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E1
Unit powers on but does not heat water; display shows E1 shortly after a hot water tap is opened.
Inlet Thermistor / Temperature Sensor Fault
E10
Display shows E10; unit does not heat and may not detect flow correctly.
Flow Rate Too Low / Minimum Flow Not Reached
E11
Display shows E11; unit may heat but then shut down unexpectedly.
Ground Fault / Leakage Current Detection
E12
Display shows E12; unit may not respond to user input or temperature changes.
User Interface / Keypad Fault
E13
Display shows E13; unit may limit output temperature or shut down.
Outlet Temperature Exceeds Safety Limit
E14
Display shows E14; unit may not start heating when flow is present.
Flow Sensor Signal Out of Range
E15
Display shows E15; unit may cycle on and off rapidly or fail to maintain temperature.
Current Imbalance / Element Bank Fault
E16
Display shows E16; unit may not power up fully or may reset intermittently.
Low Internal DC Supply / Control Power Fault
E17
Display shows E17; unit may limit power output or not reach set temperature.
Maximum Current Limit Exceeded
E18
Display shows E18; unit may not allow temperature to be set above a certain limit.
Temperature Limiting / Anti-Scald Lockout
E19
Display shows E19; unit may not start or may shut down after a few seconds.
Internal Self-Test Failure
E2
Display shows E2 and unit shuts down; water may briefly warm then go cold.
Outlet Thermistor / Temperature Sensor Fault
E20
Display shows E20; unit may not heat or may show incorrect temperature.
Calibration / Sensor Range Error
E3
Unit displays E3 and stops heating; may occur when water demand is high or inlet water is very cold.
Over-Temperature Protection / High Limit Trip
E4
Display shows E4 and unit will not heat; may appear immediately when a hot tap is opened.
Flow Sensor / Flow Switch Fault
E5
Display shows E5; unit may heat erratically or shut down during operation.
Inlet / Outlet Temperature Differential Error
E6
Display shows E6 and unit will not heat; may be accompanied by a clicking relay sound.
Triac / Power Module Overcurrent or Short Detection
E7
Display shows E7; unit may not respond to temperature adjustments or may shut down.
Control Board Communication / Internal Memory Error
E8
Display shows E8; unit may heat only intermittently or not at all.
Supply Voltage Out of Range
E9
Display shows E9; unit may shut down during operation, especially at high temperatures.
High Limit Thermostat Lockout / Overheat Lock
Symptom
Condensation or moisture visible inside the Eemax heater enclosure.
Moisture Intrusion / Condensation
Symptom
Display is on but unresponsive; buttons do not change settings.
Keypad / Interface Lock or Failure
Symptom
Hot water output temperature is different at various fixtures in the home.
Distribution / Mixing Valve Issues
Symptom
Mineral scale buildup visible on heating elements or inside the heat exchanger; reduced performance.
Lime Scale Accumulation
Symptom
No hot water at any fixture; Eemax water heater display is completely blank and unit appears dead.
No Power to Unit / Power Supply Failure
Symptom
Unit does not activate when a single low-flow faucet is opened, but works with higher flow.
Minimum Activation Flow Not Reached
Symptom
Unit emits a burning smell or visible smoke when operating.
Overheating Electrical Components
Symptom
Unit frequently shuts off during use and then restarts after a short time; no error code displayed.
Thermal Cycling / Overheat Protection Cycling
Symptom
Unit installed outdoors or in unconditioned space fails after a freeze event.
Freeze Damage to Internal Components
Symptom
Unit is noisy with water rushing or banging sounds when taps are opened or closed.
Hydraulic Noise / Water Hammer
Symptom
Unit is very hot to the touch externally, even when not in use.
Standby Overheating / Internal Heat Soak
Symptom
Unit makes a loud clicking or buzzing noise when hot water is used.
Relay / Triac Noise or Loose Mounting
Symptom
Unit trips the circuit breaker immediately or shortly after turning on hot water.
Overcurrent / Short Circuit
Symptom
Visible corrosion or green/white deposits on copper pipes and fittings inside the Eemax heater.
Internal Corrosion / Electrolysis
Symptom
Water heater is leaking from the bottom of the unit or from internal components.
Internal Water Leak / Heat Exchanger or Fitting Failure
Symptom
Water is only lukewarm or not hot enough, even with the Eemax temperature set to maximum.
Insufficient Heating Capacity / Partial Element Failure
Symptom
Water is too hot; risk of scalding even at moderate faucet settings; no error code shown.
Overheating / Temperature Overshoot
Symptom
Water temperature fluctuates between hot and cold during a shower; no error code displayed.
Temperature Fluctuation / Flow Modulation Issue
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Unit powers on but does not heat water; display shows E1 shortly after a hot water tap is opened.
|
Inlet Thermistor / Temperature Sensor Fault | View Details |
| E10 |
Display shows E10; unit does not heat and may not detect flow correctly.
|
Flow Rate Too Low / Minimum Flow Not Reached | View Details |
| E11 |
Display shows E11; unit may heat but then shut down unexpectedly.
|
Ground Fault / Leakage Current Detection | View Details |
| E12 |
Display shows E12; unit may not respond to user input or temperature changes.
|
User Interface / Keypad Fault | View Details |
| E13 |
Display shows E13; unit may limit output temperature or shut down.
|
Outlet Temperature Exceeds Safety Limit | View Details |
| E14 |
Display shows E14; unit may not start heating when flow is present.
|
Flow Sensor Signal Out of Range | View Details |
| E15 |
Display shows E15; unit may cycle on and off rapidly or fail to maintain temperature.
|
Current Imbalance / Element Bank Fault | View Details |
| E16 |
Display shows E16; unit may not power up fully or may reset intermittently.
|
Low Internal DC Supply / Control Power Fault | View Details |
| E17 |
Display shows E17; unit may limit power output or not reach set temperature.
|
Maximum Current Limit Exceeded | View Details |
| E18 |
Display shows E18; unit may not allow temperature to be set above a certain limit.
|
Temperature Limiting / Anti-Scald Lockout | View Details |
| E19 |
Display shows E19; unit may not start or may shut down after a few seconds.
|
Internal Self-Test Failure | View Details |
| E2 |
Display shows E2 and unit shuts down; water may briefly warm then go cold.
|
Outlet Thermistor / Temperature Sensor Fault | View Details |
| E20 |
Display shows E20; unit may not heat or may show incorrect temperature.
|
Calibration / Sensor Range Error | View Details |
| E3 |
Unit displays E3 and stops heating; may occur when water demand is high or inlet water is very cold.
|
Over-Temperature Protection / High Limit Trip | View Details |
| E4 |
Display shows E4 and unit will not heat; may appear immediately when a hot tap is opened.
|
Flow Sensor / Flow Switch Fault | View Details |
| E5 |
Display shows E5; unit may heat erratically or shut down during operation.
|
Inlet / Outlet Temperature Differential Error | View Details |
| E6 |
Display shows E6 and unit will not heat; may be accompanied by a clicking relay sound.
|
Triac / Power Module Overcurrent or Short Detection | View Details |
| E7 |
Display shows E7; unit may not respond to temperature adjustments or may shut down.
|
Control Board Communication / Internal Memory Error | View Details |
| E8 |
Display shows E8; unit may heat only intermittently or not at all.
|
Supply Voltage Out of Range | View Details |
| E9 |
Display shows E9; unit may shut down during operation, especially at high temperatures.
|
High Limit Thermostat Lockout / Overheat Lock | View Details |
| – |
Condensation or moisture visible inside the Eemax heater enclosure.
|
Moisture Intrusion / Condensation | View Details |
| – |
Display is on but unresponsive; buttons do not change settings.
|
Keypad / Interface Lock or Failure | View Details |
| – |
Hot water output temperature is different at various fixtures in the home.
|
Distribution / Mixing Valve Issues | View Details |
| – |
Mineral scale buildup visible on heating elements or inside the heat exchanger; reduced performance.
|
Lime Scale Accumulation | View Details |
| – |
No hot water at any fixture; Eemax water heater display is completely blank and unit appears dead.
|
No Power to Unit / Power Supply Failure | View Details |
| – |
Unit does not activate when a single low-flow faucet is opened, but works with higher flow.
|
Minimum Activation Flow Not Reached | View Details |
| – |
Unit emits a burning smell or visible smoke when operating.
|
Overheating Electrical Components | View Details |
| – |
Unit frequently shuts off during use and then restarts after a short time; no error code displayed.
|
Thermal Cycling / Overheat Protection Cycling | View Details |
| – |
Unit installed outdoors or in unconditioned space fails after a freeze event.
|
Freeze Damage to Internal Components | View Details |
| – |
Unit is noisy with water rushing or banging sounds when taps are opened or closed.
|
Hydraulic Noise / Water Hammer | View Details |
| – |
Unit is very hot to the touch externally, even when not in use.
|
Standby Overheating / Internal Heat Soak | View Details |
| – |
Unit makes a loud clicking or buzzing noise when hot water is used.
|
Relay / Triac Noise or Loose Mounting | View Details |
| – |
Unit trips the circuit breaker immediately or shortly after turning on hot water.
|
Overcurrent / Short Circuit | View Details |
| – |
Visible corrosion or green/white deposits on copper pipes and fittings inside the Eemax heater.
|
Internal Corrosion / Electrolysis | View Details |
| – |
Water heater is leaking from the bottom of the unit or from internal components.
|
Internal Water Leak / Heat Exchanger or Fitting Failure | View Details |
| – |
Water is only lukewarm or not hot enough, even with the Eemax temperature set to maximum.
|
Insufficient Heating Capacity / Partial Element Failure | View Details |
| – |
Water is too hot; risk of scalding even at moderate faucet settings; no error code shown.
|
Overheating / Temperature Overshoot | View Details |
| – |
Water temperature fluctuates between hot and cold during a shower; no error code displayed.
|
Temperature Fluctuation / Flow Modulation Issue | View Details |
No matching codes found
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