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Page
-Fault Analysis of Error Codes-
If the error code is displayed on the computer board of the micro-boiler or remote controller and/or
temperature controller, please check the following. A
ft
er checking,
consult with the manufacturer
.
Owner's Guide
Remote
Green
LED
Malfunction
descrip
tion
Diagnosis
031
One Time
Incorrect DIPswitch
se
tting
•
Check the DIPswitch se
ttings
on the PCB (Part #701).
101
Five Times Warning for the
“991” error code
•
Check the gas type of the micro-boiler.
•
Check if there is any blockage in the intake air and/
or exhaust.
•
If the micro-boiler 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
/eleva
tion
of area of where the
micro-boiler is installed.
•
Check if there is grease and/or dirt in the burner (Part
#101) and the fan motor (Part #103), especially if the
micro-boiler has been installed in a contaminated area.
111
Three Times
Ignition
failure
•
Check if the Hi-limit switch (Part #412) is properly
functioning.
•
Check for connec
tion/b
reakage of wires (Part #413, 708,
709, 710, 712), burn marks on the computer board (Part
#701), and/or soot on the
fl
ame rod (Part #108).
•
Check if there is a buzzing spark
ignition
sound
coming from the burner (Part #101) when
micro-boiler prepares for combus
tion.
•
Listen for the double “clunk” sound coming from gas
valve assembly (Part #102) when micro-boiler goes
into combus
tion.
•
Check if there is leaking from heat exchanger (Part #401).
121
Three Times Loss of
flame
•
Check if the Hi-limit switch (Part #412) is properly
functioning.
•
Check for c
onnection/b
reakage 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).
311
Two Times Heat exchanger
thermistor failure
•
Check for connec
tion/b
reakage of wires and/or
debris on thermistor (Part #407, 408, 411, 715).
321
Two Times Inlet thermistor
failure
331
Two Times Outlet thermistor
failure
341
Two Times Exhaust thermistor
failure