Table of Contents
Advertisement
Outdoor model installation
Indicator on the remote controller of Parent unit (If it is installed): "321" and "2" will alternately flash on the
display.
Green LED on the
computer board
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.
Controller Green
Malfunction
LED
description
031
One
Incorrect DIP switch
setting
Flash
101
Five
Warning for the "991"
error code
Flashes
111*
Three
Ignition failure
Flashes
121*
Three
Loss of flame
Flashes
291
Five
Blocked condensate
drain system
Flashes
311*
Two
140H/240H/340H: Outlet
Thermistor Failure
Flashes
540H: Heat Exchanger
Thermistor Failure
321*
Two
Inlet thermistor failure
Flashes
*These error codes will be cleared when water flow stops.
Unit #1
Unit #2
PARENT
CHILD
Error code
321
-Fault Analysis of Error Codes-
• Check the DIP switch settings on the PCB (Part #701).
• 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.
• 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).
• 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).
• 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.
• Check for connection/breakage of wires and/or debris on thermistor (Part
#407, 408, 411, 715).
60
Page
Unit #3
Unit #4
CHILD
CHILD
Green LED
on
on
on
on
on
on
off
off
off
off
off
Diagnosis
Owner's Guide
Troubleshooting
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.
Advertisement
Table of Contents
