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37
PROBLEM POSSIBLE CAUSES CORRECTIVE ACTION
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 ame sense lead from ignitor to ame Check ground connections, adjust as necessary
sense module
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)
Insu cient Heating Target temperature too low Increase stage control target temperature
Primary (safety high) limit set too low Increase limit se ing
Unit Consistently Shuts Down Primary (safety high) limit set to low Increase limit se ing
On Limit
Bad Combustion Insu cient air • Check CO, adjust blower inlet damper(s) to
(High CO, Yellow Flames) increase air ow
• Check for plenum air leakage from lower front
jacket panel seams, repair as necessary
Dirty inlet air lter Remove, inspect and clean inlet air lter as
necessary
Too much air Check CO, adjust blower inlet damper(s) to
decrease air ow
Gas Flow Shuts Down During Low air (blocked ue/inlet) condition • Check indicator board for low air indication
Operation (Blowers Remain On) air indication
• If condition exists, check inlet, ue, chimney for
blockage
• Check combustion air/ventilation openings in
space
• Check inlet air lter, clean/replace as necessary
TROUBLESHOOTING
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