MG & SG Series Boilers – Installation and Service Manual
30
Problem Possible Cause Solution
• No spark. • High voltage wiring is loose, broken or
grounded. Repair wiring.
• Ignition electrodes are damaged. • Replace electrodes.
• Ignition electrodes improperly adjusted. • Correct adjustment of electrode.
• Faulty electronic ignition controller. • Replace controller.
• No gas. • Confirm supply of gas to pilot and repair if
necessary.
• Gas supply pipes not purged of air. • Purge gas line.
• Low pilot gas pressure. • Adjust pressure.
Pilot flame will not light on
electronic ignition.
• Dirt or foreign material in pilot. • Clean.
• Incorrect pilot flame pressure. • Set pilot pressure to correct pressure.
• Poor connections in wiring to flame sensor. • Repair wiring.
• Electrodes are damaged. • Replace electrodes.
Pilot lights but flame
failure after trial for
ignition.
• Ignition electrodes improperly adjusted. • Correct adjustment of electrodes.
• Ignition electrodes are wet, dirty or
improperly adjusted (for electronic ignition
only).
• Check, clean, change and/or adjust the
electrodes.
Burner starts but flame
will not stay established.
• Poor connections in wiring to flame sensor. • Repair wiring.
• Incorrect orifice sizing. • Check orifice and replace if necessary.
• Inadequate combustion and ventilation air. • Check and adjust.
• Dusty environment. • Clean.
• Low return water temperature. • Adjust system.
Boiler carbonizes (forms
soot) quickly.
• Manifold pressure too high. • Adjust manifold pressure.
• Insufficient circulation. • Check pump, clean and replace if necessary.
• Air trapped in piping. • Purge system.
Boiler overheats and
system remains cold.
• Improper system wiring. • Test and correct.
• Faulty thermostat or controller. • Check, adjust, and replace if necessary.
• Faulty aquastat and/or safety high limit
aquastat.
• Check, adjust, and replace if necessary.
Boiler and heating system
overheat.
• Faulty wiring. • Check wiring for short circuits and repair.
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