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ERROR CODE DIAGNOSTICS
2.1 NO ERROR CODE AND NO HOT WATER
EXPLANATION
No hot water is delivered when water is flowing through
unit and with LCD displaying the hot water temperature
setting.
NOTE: For "NO POWER" complaint (LCD will not turn
on) Check wall outlet for 120V. If voltage is present,
check the two 10 amp fuses at the control board.
When replacing a serviceable component, turn off all
power to the water heater and check for the presence of
power with a multimeter or test lamp.
POSSIBLE CAUSE
•
Low or no Water flow (minimum 0.4 GPM to activate)
•
Unit was not set to "Enable".
•
Debris in Inlet filter or Water Control Valve
•
Water flow sensor.
WATER FLOW SENSOR
1. Use cold water shutoff valve to turn OFF water supply
to unit.
2. Turn power switch to OFF position. Wait 10 seconds.
3. Turn power switch to ON position. Wait 20 seconds,
Confirm Mode is Enabled.
4. Turn water supply ON; check the nearest hot water
fixture for hot water.
5. Go to status mode and check the flow rate with one
or more hot water faucets running.
•
If the unit shows above 0.4 gpm, and the unit
does not fire, replace the control board.
•
If the unit shows 0.4 gpm or less, check the wa-
ter inlet filter, other plumbing fixtures, and flush
the water heater.
•
If the unit shows no flow detected, flush the wa-
ter heater and remove any debris from the water
inlet filter and from the water control valve.
NOTE: If water is flowing backward through the unit
it will not be able to detect flow. Ensure water supply
lines are connected correctly.
37
IKONIC Tankless Water Heater Service Manual
FINAL CHECK: Water flow sensor in water volume con-
trol valve.
Check the voltage between #10 wire (Red) and #8 wire
(Black) at the connector " I ".
•
With the unit turn ON and no water flow, you should
read 11 to 17 DC volts.
•
If reading is not 11 17 DC Volts, replace the control
board.
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