Navien LST-58K, Instruction Manual

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When an error occurs, the LCD shows one of the following numeric error codes
with letter 'E'.
Error co d e
02 Low water level
Not enough water to operate
the unit
OFF OFF
03 Fail to ingniting Ignition a failure Fa OFF
Controling the
temperature
04
If detecting any flame in the
chamber during pre-purge and
post-purge
Flame-sensor
(Lower gas pressure)
OFF
Controling the
temperature
05 Heating water sensor is disconnected
Heating sensor wire
disconnected
OFF ON
06
Heating water sensor is in a short
circuit Short circuit of heating
sensor
OFF ON
16
Abnormal statue of heating
water temperature
Mechanical overheat OFF ON
12
Failure of flame is occurred during
the combustion Flame failure in
combustion
OFF
Controling the
temperature
Code Factors Problems
Operation
Fan
Circulation
Pump
25