60
Page
-Fault Analysis of Error Codes-
If the error code is displayed on the computer board of the water heater or remote controller and/or tempera-
ture controller, please check the following. After checking,
consult with the manufacturer
.
Troubleshooting
Owner's Guide
Controller Green
LED
Malfunction
description
Diagnosis
031
One
Flash
Incorrect DIP switch
setting
• Check the DIP switch settings on the PCB (Part #701).
101
Five
Flashes
Warning for the “991”
error code
• Ensure the gas type of the water heater matches the gas supplied.
• Inspect the environment around the water heater. Determine how long the
unit has been installed.
• Ensure the heater altitude DIP switches are properly set to match the
installed altitude.
• 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 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.
111*
Three
Flashes
Ignition failure
• Check if the Hi-limit switch (Part #412) is properly functioning.
• Check for connection/breakage of wires (Part #413, 708, 709, 711) 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 the 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).
121*
Three
Flashes
Loss of flame
• Check if the Hi-limit switch (Part #412) is functioning properly.
• Check for connection/breakage of wires (Part #413, 708, 709, 711) 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).
291
Five
Flashes
Blocked condensate
drain system
• Check for and remove any blockage in the condensate drain line, neutralizer
(if installed), condensate drain assembly inside the water heater (part #416,
421, 423).
• Ensure that any horizontal drain line runs are sloped downward. Removal
any sags in the drain line.
311*
Two
Flashes
140H/240H/340H: Outlet
Thermistor Failure
540H: Heat Exchanger
Thermistor Failure
• Check for connection/breakage of wires and/or debris on thermistor (Part
#407, 408, 411, 715).
321*
Two
Flashes
Inlet thermistor failure
Error code
Green LED
on
on
on
on
on
on
off
off
off
off
off
321
Unit #1
PARENT
Unit #2
CHILD
Unit #3
CHILD
Unit #4
CHILD
Green LED on the
computer board
Outdoor model installation
Indicator on the remote controller of Parent unit (If it is installed):
“321” and “2” will alternately flash on the
display.
No. 2 Unit: The green LED
on the computer board will
indicate this code with two
flashes every 1/2 second.
No. 3&4 Unit: No sign.
*These error codes will be cleared when water flow stops.
Summary of Contents for 140H
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