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Heatilator • Novus NDV Series • 4055-187 Rev F • 06/08 61
Troubleshooting (continued)
Symptom Possible Cause Corrective Action
3. (Continued) C. Failed valve. Turn the valve knob to the ON position. Place the ON/OFF switch
in the ON position. Check the millivolt meter a the thermopile
terminals. The millivolt meter should read greater than 125mV. If the
reading is acceptable, and if the burner does not come on, replace
the gas valve.
D. Plugged burner orifi ce. Check the burner orifi ce for stoppage. Remove stoppage.
E. Wall switch or wires. Follow the corrective action in Symptom and Possible Cause 1.a
above. Check the switch and wiring.
4. Frequent pilot outage
problem.
A. Pilot fl ame may be too high or
too low, or blowing out (high
pressure), causing pilot safety
to drop out.
Clean thermocouple and adjust the pilot fl ame for proper fl ame
impingement. Follow lighting instructions carefully.
5. The pilot and main
burner extinguish while in
operation.
A. No LP in tank. Check the LP (propane) tank. Refi ll the fuel tank.
B. Improper gas inlet pressure. Verify with manometer. NG should read 5-14 inches w.c. LP should
read 10-14 inches w.c.
C. Inner vent pipe leaking exhaust
gases back into the system.
Check venting system for damage. Replace/repair improperly
assembled pipe sections.
D. Glass installed improperly. Check to ensure glass is installed properly. Replace glass panel
assembly.
E. Failed thermopile or
thermocouple.
Replace pilot if necessary.
F. Improper vent cap installation. Check for proper installation and freedom from debris or blockage.
6. Glass soots. A. Flame impingement. Adjust the log set so that the fl ame does not excessively impinge on
it. Refer to log instructions.
B. Improper air shutter setting. Refer to manual for shutter set points. Ensure that set point is
correct for appliance/gas type. If unit has adjustable shutter, it may
be necessary to increase shutter opening.
C. Debris around air shutter. Inspect the opening at the base of the burner. NO MATERIAL
SHOULD BE PLACED IN THIS OPENING.
7. Flame burns blue and lifts
off burner.
A. Insuffi cient oxygen being
supplied.
Ensure that the vent cap is installed properly and free of debris.
Ensure that the vent system joints are tight and have no leaks.
Ensure that no debris has been placed at the base of, or in the area
of the air holes in the center of the base pan beneath the burner.
Ensure that the glass is tightened properly on the unit, particularly
on top corners.