Water is only lukewarm or not hot enough, even with the Eemax temperature set to maximum.

Safety: Turn OFF power at the breaker before opening the unit.

Diagnostic and correction:

• Verify the temperature setpoint on the display is at the desired level and not limited by a lockout feature.
• Measure the supply voltage at the heater terminals to ensure it matches the rating (e.g., 240 V). Low voltage reduces heating capacity.
• Remove the cover and test each heating element for continuity with a multimeter. Replace any element that is open or significantly out of spec.
• Confirm that both hot legs (L1 and L2) are properly connected and energized; a missing leg can cause reduced power.
• Compare your flow rate and inlet water temperature to the Eemax sizing chart. If the unit is undersized, you may need to reduce flow (install flow restrictors) or upgrade to a larger model.

After repairs, run hot water and verify that outlet temperature meets expectations.