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22 TROUBLESHOOTING GUIDE
SYMPTOM SOLUTION
1. Power light is not lit when switch is
flipped to “ON”
• Check wiring to switch.
• Check circuit breaker.
• Check fuse.
2. Water flow light remains off.
• Verify that pump is running.
• Check wiring to flow switch.
3. Pilot sparks but does not light
• Verify that main manual valve is open.
• Follow lighting instructions to bleed air out of pilot
line.
• Remove main burner and inspect for moisture or
dirt in pilot or in pilot line.
• Verify that pilot is sealed to main burner base.
• Verify that gas connections are tight.
4. Pilot lights momentarily, goes out
and then sparks again repeatedly
• Observe pilot for proper flame. Adjust if necessary.
• Check pilot flame signal. Properly set pilot to
generate 1.5 µA. D.C. on average.
• Remove main burner and ensure that the igniter
and ground electrodes are positioned properly.
Clean with steel wool if necessary.
• Verify that back of burner box is fully engaged into
the retaining slot in the combustion chamber base.
5. Pilot lights but main burner does not
fire.
• Verify that high limit is set high enough to prevent
short cycling.
• Check pilot flame signal (µA).
• Adjust pilot pressure for steady flame
• Remove main burner. Check position of the igniter
and ground electrode. Clean with steel wool if
necessary.
6. Main burner lights but cycles off after
a few minutes
• Verify that high limit is set high enough to prevent
short cycling.
• Adjust pilot pressure for steady flame
• Remove main burner. Adjust pilot shield and clean
ignition sensor.
7. Boiler starts to whine as the
temperature rise increases.
• Verify that all air is bled from system.
• Verify that the static pressure in cold system is at
least 15 psig.
• Check temperature rise across boiler to ensure
adequate water flow.
• If necessary, increase static water pressure and
decrease gas pressure.
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