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SYMPTOM
IV.Frequent pilot outage
problem.
V. Pilot and main burner go out
while being in operation.
CORRECTIVE ACTION
1. Turn valve knob to “ON”. Place
ON/OFF switch to “ON”. Check
with millivolt meter at thermopile
terminals. Millivolt meter should
read greater than 100 m.v. If the
reading is okay and the burner
does not come on, replace the
gas valve.
1. Check burner orifice for stoppage
and remove.
1. Follow corrective action in A.1
above; check switch and wiring.
Replace where defective.
1. Clean and adjust pilot flame for
maximum flame impingement on
thermopile.
1. Allow unit to cool. Then repeat
lighting instructions. If pilot and
burner remain lit after the heater
warms up, the switch is good.
2. If 1 above does not allow for igni-
tion, or the heater continues to
shut-off, disconnect the limit
switch wire from the gas valve
and repeat the lighting instruc-
tions. If the pilot and burner re-
main lit after the heater warms
up, replace the limit switch. Do
not use the heater until the
high limit switch is replaced
and properly wired.
1. Check for leaks.
1. Horizontal flue termination
should slope down only enough
to prevent water from entering
unit. The maximum downward
slope is 1/4" (6.4mm) for any hori-
zontal run.
POSSIBLE CAUSE
C. Defective valve.
D. Plugged burner orifice.
E. Wall switch or wires defective.
A. Pilot flame may be too low or
blowing (high), causing the pi-
lot safety to drop out.
A. High limit switch is defective or
has reached its maximum tem-
perature.
B. Inner 5-inch (13mm) pipe leak-
ing exhaust gases back into
system.
C. Horizontal flue improperly
pitched.