DOMINATOR INSTALLATION AND OPERATION INSTRUCTIONSPage 38
Trouble-Shooting
PROBLEM POSSIBLE CAUSES CORRECTIVE ACTION
Unit Does Not Spark continued Spark generator fault • Check spark generator wiring
Unit Sparks But Will Not Fire Low gas pressure Check gas supply pressure, adjust
as necessary
Pilot valve manual knob closed Open pilot valve manual knob
Pilot wires disconnected Reconnect wires
Low pilot pressure Check pilot pressure, adjust as
necessary
Pilot valve malfunctioning Replace pilot valve
Pilot Lights But Unit Will Not Fire Bad fl ame sense lead from ignitor Check ground connections, adjust
to fl ame sense module as necessary
Manual valve(s) closed Remove upper front jacket panel,
open manual valve(s)
Low manifold pressure Check manifold pressure, adjust as
necessary
Main valve(s) malfunctioning Replace main valve(s)
Insuffi cient Heating Target temperature too low Increase stage control target
temperature
Primary (safety high) limit set Increase limit setting
too low
Unit Consistently Shuts Down Primary (safety high) limit set Increase limit setting
On Limit too low
Bad Combustion Insuffi cient air • Check CO, adjust blower inlet
(High CO, Yellow Flames) damper(s) to increase airfl ow
• Check for plenum air leakage
from lower front jacket panel
seams, repair as necessary
Dirty inlet air fi lter Remove, inspect and clean inlet air
fi lter as necessary
Too much air Check CO, adjust blower inlet
damper(s) to decrease airfl ow
Gas Flow Shuts Down During Low air (blocked fl ue/inlet) • Check indicator board for low
Operation (Blowers Remain On) condition air indication
• If condition exists, check
inlet, fl ue, chimney for blockage
• Check combustion air/ventilation
openings in space
• Check inlet air fi lter, clean/replace
as necessary
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