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49-6000243 Rev. 0
17
Troubleshooting
Before you call for service....
Save time and money! Review the chart below first and you may not need to call for service.
CAUTION
For your safety, DO NOT attempt repair of electrical wiring, controls, heating elements or other
safety devices. Refer repairs to qualified service personnel.
Problem Possible Causes What To do
Digital display is not
activated
No power or incorrect wiring Check breakers at main electrical panel to ensure it is not tripped. If tripped, reset
breaker. Check that water heater is wired correctly.
Not enough flow Turn on hot water at fixture.
No hot water No power or incorrect wiring Check breakers at main electrical panel to ensure it is not tripped. If tripped, reset
breaker. Check that water heater is wired correctly.
Overtemperature protection has
been triggered
The water heater is equipped with software that turns off the heating elements
when water temperatures reach a dangerous level. Turn off hot water, wait
several minutes for water to cool.
Flow rate is too low Each model water heater has an activation flow rate. If the water flow is less than
this flow level, unit will not heat water. Increase the flow rate.
Hot water supply is warm,
but it does not get hot
Temperature set point is too low Increase the temperature set point, Be cautious of scald risk.
Flow rate is too high Reduce flow rate.
Voltage less than 240 VAC (120
VAC for GE04SNLPDG)
The heating elements on your water heater are designed for 240 VAC
applications. When used a lower voltage, the water heater will produce less hot
water.
No power or incorrect wiring Check breakers at main electrical panel to ensure it is not tripped. If tripped, reset
breaker. Check that water heater is wired correctly.
Mixing too much cold water Tankless water heaters do not require mixing as much cold water as a
conventional storage water heater. Adjust handle of fixture or mixing valve on
faucet to reduce the amount of cold water mixed.
Cold inlet temperature may be
lower during winter months
This is normal. The colder inlet water requires more heat to reach the
temperature set point. Increase the temerature set point.
Water is too hot Temperature set point too high Reduce temperature set point.
Remote control is not
working
Batteries are dead Replace with new batteries.
Batteries are installed incorrectly Ensure batteries are installed in the correct orientation.
NOTE: If your water heater runs out of water too quickly or hot water supply is not hot enough, it may be too small for
your needs. Consider replacing it with a larger model or adding additional water heaters to meet ow demand needs.
Fault Codes
Fault Code Displayed Condition Action
E0 Signal failure Call Service
E1 Over temperature protection Wait for water to cool, power ON/OFF
E3 Inlet temperature sensor failure Call Service
E4 Outlet temperature sensor failure Call Service
TROUBLESHOOTING
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