Millivolt Troubleshooting - Empire Comfort Systems VFLL38FP30L-1 Installation Instructions And Owner's Manual

SYMpTOMS, pOSSIBLE CAUSES AND CORRECTIONS
1. When ignitor button is pressed, there is no spark at ODs/
pilot.
a. Ignitor electrode positioned wrong - Replace pilot.
b. Ignitor electrode is broken - Replace pilot.
c. Ignitor electrode not connected to ignitor cable - Reconnect
ignitor cable.
d. Ignitor cable pinched or wet. Keep ignitor cable dry - Free
ignitor cable if pinched by any metal or tubing.
e. Broken ignitor cable - Replace ignitor cable.
f. Bad piezo ignitor - Replace piezo ignitor.
2. Appliance produces unwanted odors.
a. Appliance burning vapors from paint, hair spray, glues, etc.
- Ventilate room. Stop using odor causing products while
heater is running.
b. Gas leak - Locate and correct all leaks.
3. Appliance shuts off during use. (Pilot and main burner are
off.)
a. Not enough fresh air is available for ODS/pilot to operate -
Open window and/or door for ventilation.
b. Low line pressure - Contact local gas company.
c. ODS/pilot is partially clogged - Clean ODS/pilot.
d. Defective thermocouple - Replace pilot.
4. Appliance shuts off during use. (pilot stays on.)
a. Low line pressure - Check line pressure to the valve.
b. Defective thermopile - Check pilot flame, check wire
connections, output should be a minimum of 325 millivolts
across. TH/TP and TP terminals with REMOTE/OFF/ON
switch off.
5. Gas odor even when control knob is in OFF position.
a. Gas leak - Locate and correct all leaks.
b. Control valve defective - Replace control valve.
6. When ignitor button is pressed, there is spark at ODs/pilot,
but no ignition.
a. Gas supply turned off or manual shutoff valve closed - Turn
on gas supply or open manual shutoff valve.
b. Control knob not in PILOT position - Turn control knob to
PILOT position.
c. Control knob not pressed in while in PILOT position - Press
in control knob while in PILOT position.
d. Air in gas lines when installed - Continue holding down control
knob. Repeat igniting operation until air is removed.
e. ODS/pilot is clogged - Replace ODS/pilot assembly or get
it serviced.
f. Gas regulator setting is not correct - Replace gas
regulator.
If the gas quality is bad, your pilot may not stay lit, the burners may produce soot and the heater may backfire when lit. If the
gas quality or pressure is low, contact your local gas supplier immediately.
29516-10-0713

MILLIvOLT TROUBLESHOOTING

7. O Ds/pilot lights but flame goes out when control knob is
released.
a. Control knob not fully pressed in - Press in control knob
fully.
b. Control knob not pressed in long enough - After ODS/pilot
lights, keep control knob pressed in 30 seconds.
c. Manual Shutoff valve not fully open - Fully open manual
shutoff valve.
d. Thermocouple connection loose at control valve - Hand
tighten until snug, then tighten 1/4 turn more.
e. Pilot flame not touching thermocouple, which allows
thermocouple to cool, causing pilot flame to go out. This
problem could be caused by either low gas pressure or dirty or
partially clogged ODS/pilot - Contact local gas company.
f. Thermocouple damaged - Replace thermocouple.
g. Control valve damaged - Replace control valve.
8. Burner does not light after ODS/pilot is lit.
a. Burner orifice clogged - Clean burner or replace main burner
orifice.
b. Burner orifice diameter is too small - Replace burner
orifice.
c. Inlet gas pressure is too low - Contact qualified service
person.
9. If burning at main burner orifice occurs (a loud, roaring
blow torch noise).
a. You must turn off burner assembly and contact a qualified
service person.
b. Manifold pressure is too low - Contact local gas company.
c. Burner orifice clogged - Clean burner or replace burner
orifice.
10. heater produces a whistling noise when main burner is
lit.
a. Turning control knob to HIGH position when main burner is
cold - Turn control knob to LOW position and let warm up
for a minute (does not apply to 10k BTU models)
b. Air in gas line - Operate burner until air is removed from
line. Have gas line checked by local gas company.
c. Dirty or partially clogged burner orifice - Clean burner or
replace burner orifice.
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