Installation Instructions

Owner's Guide
Page
50
Display
Green
LED
Malfunction
Description
Diagnosis
031
One Time
Incorrect DIPswitch
setting
• Check the DIPswitch settings on the PCB (Part #701).
101
Five
Times
Warning for the "991"
error code
• Check if the gas type of the micro-boiler matches the gas
supplied to it.
• 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/elevation of area where the micro-
boiler is installed and match the appropriate DIPswitches.
• 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.
• Check if the DIPswitches match gas type of the micro-
boiler.
• Check the manifold pressure at Max. and Min.
• Check combustion chamber tube (Part #117) to make
sure it is clear and securely installed.
111
Three
Times
Ignition failure
• Check if the Hi-limit switch (Part #411) is properly
functioning.
• Check for connection/breakage of wires (Part
#412,707,708,709,710), burn marks on the computer
board (Part #701), and/or soot on the ame rod
(Part#108).
• Check if there is a buzzing spark ignition sound coming
from the burner (Part #101) when micro-boiler prepares
for combustion.
• Listen for the double "clunk" sound coming from gas valve
assembly (Part #102) when the micro-boiler goes into
combustion.
• Check if there is leaking from heat exchanger (Part #401).
• Check that the gas is turned on.
• Check gas supply.
121
Three
Times
Loss of ame
• Check if the Hi-limit switch (Part #411) is properly
functioning.
• Check for connection/breakage of wires (Part
#412,707,708,710), burn marks on the computer board
(Part #701), and/or soot on the ame rod (Part #108).
• Check if there is leaking from heat exchanger (Part #401).
• Check gas supply.
311
Two Times
Outlet thermistor
failure
• Check for connection/breakage of wires and/or debris on
thermistor (Part #407,408,715).
• Check the resistance.
321
Two Times Inlet thermistor failure
341
Two Times
Exhaust thermistor
failure
-Fault Analysis of Error Codes-
Troubleshooting
If an error code is displayed on the computer board of the micro-boiler and/or on the temperature
controller, please check the following. After checking, consult with the manufacturer.