HearthStone Quality Home Heating Products, Inc.
MODENA 8140 Gas-Fired Direct-Vent
23
T
ROUBLESHOOTING
Symptom
Possible Cause
Corrective Action
1. Pilot will not light.
A. Insufficient gas pressure, air in
the pilot line, or dirty or kinked gas
line.
B. Pilot orifice plugged.
C. Defective or misaligned
electrode at pilot.
D. Defective igniter.
E. After sitting for "off" season
(summer), pilot assembly may be
dirty.
A. Using the piezo sparker, try to light the pilot. If it will
not light, check the inlet gas pressure.
B. Clean or replace the pilot assembly.
C. If a match lights a pilot, check the electrode gap and
location. Should be a 1/8" gap in the flame area.
D. Check for a good connection between igniter and
electrode. Check wire insulation. If properly connected
and no spark, replace igniter.
E. Clean or replace the pilot assembly.
2. Pilot will not stay lit
after carefully following
lighting instructions.
A. Low or too high gas pressure
B. Faulty connections.
C. Defective thermocouple.
D. Pilot dirty or plugged.
A. Check for proper inlet pressure for the gas being
used.
B. Measure voltage between valve body and solder
connection on the rear of the valve (where the blue
wire connects). It should be no less than 7 mV.
C1. Ensure that the thermocouple connection at the
gas valve is tight.
C2. Check thermocouple output using milli-volt meter.
Disconnect from valve and read voltage across wire
ends. If the reading is less than 15 mV, replace the
pilot assembly.
C3. If burning NG, check pilot flame to see that it is
impinging on the top of the thermocouple. Clean or
replace pilot for maximum flame impingement.
D. Clean or replace the pilot assembly.
