User Guide

47 Page
-Fault analysis of error codes-
If the error code is displayed on the computer board of the water heater or remote controller, please
check the following. After checking, consult with the manufacturer.
Troubleshoong
Owner's Guide
110 and 310 510
Malfunction
description
Diagnosis
Red
LED
Remote
Remote
7 Seg LED
One
Flash
03* 031*
Incorrect DIP
switch setting
 Check the DIP switch settings on the PCB (Part #701).
Five
Flashes
10 101
Warning for the
“991” error code
 Check the gas type of the water heater.
 Check if there is any blockage in the intake air and/or
exhaust.
 If the water heater is installed as a direct-vent system,
check whether there is enough distance between the
intake air terminal and the exhaust terminal.
 Check the altitude/elevation of area of where the water
heater is installed.
 Check if there is grease and/or dirt in the burner (Part #101)
and the fan motor (Part #103), especially if the water heater
has been installed in a contaminated area.
Three
Flashes
11* 111*
Ignition failure  Check if the Hi-limit switch (Part #412) is functioning
properly.
 Check for connection/breakage of wires (Part #413, 708, 709,
710, 712), burn marks on the computer board (Part #701),
and/or soot on the flame rod (Part #108).
 Check if there is a buzzing spark ignition sound coming
from the burner (Part #101) when water heater prepares
for combustion.
 Listen for the double “clunk” sound coming from gas
valve assembly (Part #102) when water heater goes into
combustion.
 Check if there is leaking from heat exchanger (Part #401).
Three
Flashes
12* 121*
Loss of flame
 Check if the Hi-limit switch (Part #412) is functioning
properly.
 Check for connection/breakage of wires (Part #413, 708,
709, 710, 712), burn marks on the computer board (Part
#701), and/or soot on the flame rod (Part #108).
 Check if there is leaking from heat exchanger (Part #401).
Two
Flashes
31* 311*
Outlet
thermistor
failure
 Check for connection/breakage of wires and/or debris on
thermistor (Part #407, 408, 411, 716).
Two
Flashes
32* 321*
Inlet thermistor
failure
N/A N/A
331*
Mixing thermis-
tor failure
*These error codes will be cleared when water flow stops.