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NOTE: DIAGRAMS & ILLUSTRATION NOT TO SCALE.
16
TROUBLESHOOTING THE CF MILLIVOLT GAS CONTROL SYSTEM
1. Spark ignitor will not light
pilot after repeated
triggering of black button.
2. Pilot will not stay lit after
carefully following the
lighting instructions.
3. Pilot burning, no gas to
burner, Valve knob “ON,”
Wall Switch “ON.”
4. Frequent pilot outage
problem.
5. Frequent burner outage
problem.
CORRECTIVE ACTIONSYMPTOM
A. Defective ignitor
(no spark at electrode).
B. Defective or misaligned electrode
at pilot (spark at electrode).
C. Gas supply pressure errant.
D. Pilot orifice plugged.
A. Defective pilot generator (thermo-
couple).
A. Wall switch or wires defective.
B. Thermopile may not be generating
sufficient millivoltage.
C. Plugged burner orifice.
D. Defective door switch (located at
lower right corner of door frame).
A. Pilot flame may be too low or
blowing (high) causing the pilot
safety to drop out.
A. Pilot flame may be too low or
blowing (high) causing the valve
safety to drop out.
Check for spark at electrode and ODS; if no spark and
electrode wire is properly connected, replace ignitor.
Using a match, light pilot. If pilot lights, turn off pilot and
trigger the red button again. If pilot lights, an improper gas
mixture caused the bad lighting and a longer purge period is
recommended. If pilot will not light – check gap at electrode
and pilot - should be ¹⁄₈" to have a strong spark. If gap
measures ¹⁄₈", replace ODS system (
Figure 19
).
Check inlet gas pressure. It should be within the limits as
marked on the rating plate.
Clean or replace ODS orifice.
Check pilot flame, it must impinge on thermocouple (
Figure
19
). Clean and/or replace or adjust ODS for maximum flame
on thermocouple. Ensure that the connection between the
valve and thermocouple are tight and secure.
Check wall switch and wires for proper connections. Jumper
wire across terminals at wall switch, if burner comes on,
replace defective wall switch. If okay, jumper wires across
wall switch wires at valve, if burner comes on, wires are faulty
or connections are bad.
Check thermopile with millivolt meter. Take reading at ther-
mopile terminals of gas valve. Should read 325 millivolts
minimum with optional wall switch “OFF.” Replace faulty
ODS system if reading is below specified minimum.
Check burner orifice for stoppage and remove.
Remove door frame (see instructions).
Remove two (2) screws from switch mounting bracket, pull
switch out.
Jumper wire across terminals of door switch.
If burner comes on, door switch is defective. Replace.
Clean and/or adjust pilot flame for maximum flame impinge-
ment on thermocouple (
Figure 19
).
Clean and/or adjust pilot flame for maximum flame impinge-
ment on thermopile (
Figure 19
).
POSSIBLE CAUSES
Note: Before troubleshooting the gas control system, be sure external gas shut off valve (located at gas supply inlet) is in the “ON” position.