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23.3 Burner
PROBLEM
POSSIBLE CAUSE
Auxiliary contact not closed.
Flame control
Burner/winter switch closed?
does not try for
ignition
High temp limit switch tripped?
Low airflow pressure switch contacts not made.
High airflow pressure switch contacts not made.
Optional: Mild weather stat, dial set to low
Optional: High gas pressure switch
Optional: Low gas pressure switch
Flame control defect
Failure to ignite pilot or main flame
Burner Lockout
Flame control failure
No spark
No PILOT flame
No gas
Improper pilot gas pressure
Pilot flame does
Flame rod does not detect flame, Is there 5VDC
not stay lit
on Flame signal at flame safeguard?
Flame rod dirty
SOLUTION
Properly mount contact or replace
Replace switch
Manually reset or replace
Check blower operation
Reconnect tubes to pressure switch
Clean pressure test tubes
Check filters/duct work for restrictions
Check blower FLA and compare to data plate.
Cabinet pressure too high check system setup
and for restrictions down stream of blower.
Set dial higher
Replace stat
Manual reset
Verify gas pressure
Manual reset
Verify gas pressure
Replace
Reset the flame control module at the unit and
proceed to the next step, observing the unit to
indicate at which step lockout condition occurs.
Check wiring from burner control to ignition
transformer.
Check high tension wire to spark plug.
Replace ignition transformer.
Open manual gas shut off valves.
Check wiring from burner control to pilot gas
valve.
Verify inlet gas pressure.
Adjust pilot gas pressure.
Replace pilot gas valve.
Check burner pilot opening for obstruction.
Adjust pilot gas pressure.
Replace flame rod
Replace flame rod
Clean flame rod
SECTION 23: T
ROUBLESHOOTING
81
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