Service manual

42
14 TROUBLE SHOOTING GUIDE
SYMPTOM SOLUTION
1. Power light is not lit when switch is flipped to
“ON”
• Check wiring to switch.
• Activate push button for latch relay if
provided.
• 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
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 main manual valve is in “ON”
position.
• Check wiring to valve from ignition control.
6. Main burner lights but cycles off after a few
minutes
•
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
igniter and ground electrode. Clean with
steel wool if necessary.
7. Appliance 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 at the highest
point in the system.
• Check temperature rise across appliance
to ensure adequate water flow.
• If necessary, increase static water
pressure and decrease gas pressure.