Installation Instructions

42
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. After checking, Consult with the manufacturer.
Remote
Green
LED
Diagnosis
descrip
031
One Time Incorrect DIPswitch
se
101
Five Times
• Check the DIPswitch se
on the PCB (Part #701).
Warning for the
“991” error code
111
Three Times failure
• 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
/eleva 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.
121
Three Times Loss of flame
311
Two Times Heat exchanger
thermistor failure
321
Two Times
331
Inlet thermistor
failure
Two Times
341
Outlet thermistor
failure
• Check for connec
reakage of wires and/or
debris on thermistor (Part #407, 408, 411, 715).
Two Times
• Check if the Hi-limit switch (Part #412) is properly
• Check for connec 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 a buzzing spark
sound
coming from the burner (Part #101) when
micro-boiler prepares for combus
• Listen for the double “clunk” sound coming from gas
valve assembly (Part #102) when micro-boiler goes
into combus
• Check if there is leaking from heat exchanger (Part #401).
• Check if the Hi-limit switch (Part #412) is properly
• Check for c 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).
Exhaust thermistor
failure