IOM GMI 2M & 2ML Nov 2010.doc
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4.2 Troubleshooting
Fault Cause Corrective Action
♦ Blower does not start ♦ Power not supplied to the unit.
♦ Safety loop open.
♦ None of the above
♦ Ensure power switch is on.
♦ Check both fuses on the power and the supply
sides.
♦ Ensure BMS (if connected) calls for heat.
♦ Ensure high temperature limit switch is closed.
♦ Ensure maximum operating temperature switch
is closed.
♦ Ensure low gas pressure switch is closed.
♦ See page 20 of the Riello catalogue for burner
controller trouble shooting.
♦ Unit does not start ♦ Blower does not run.
♦ Air pressure switch installed
on the housing is open.
♦ Gas pressure switch is open.
♦ No ignition.
♦ See above
♦ Adjust switch.
♦ Replace switch (if defective).
♦ Adjust the switch.
♦ Replace switch (if defective).
♦ See page 20 of the Riello catalogue for burner
trouble controller trouble shooting
♦ Pilot flame failure ♦ Pilot gas valve not opened
♦ No ignition
♦ Check the electrical connections to ensure they
are all securely connected (see the schematic
wiring diagram for terminals).
♦ Check the two, safety shut off valves. Replace
if defective.
♦ Check the electrical connections to ensure they
are all securely connected (see “Factory Wiring
Diagram” on page 15 of the Riello catalogue)
for terminals.
♦ Check the flame rod to ensure it is clean and
free of any sedimentation. Clean flame rod if
necessary.
♦ Check the flame rod for any cracks or other
defects. Replace flame rod if necessary.
♦ Measure gas pressure in the pilot line at the exit
test port of the second safety valve (downstream
of the regulator). Ensure it is within the
specified 2”-5” wc. If pressure is not available
check both safety shut off valves and the
pressure regulator. Replace any defective
component, if necessary.
♦ Main flame failure ♦ Main gas valve not opened.
♦ Check the electrical connections to ensure they
are all securely connected.
♦ Check the two safety shut off valves. Replace if
defective.
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