Hearthstone Quality Home Heating Products, Inc.
Tucson DX/ST Model 8702
41
Troubleshooting
Symptom
Possible Cause
Corrective Action
1. Pilot will not light.
A. Power supply not plugged in
and/or batteries are dead.
B. Insufficient gas pressure, air in
the pilot line, or dirty or kinked gas
line.
C. Pilot orifice plugged.
D. Defective or misaligned
electrode in pilot assembly.
E. Defective ignitor.
F. After sitting for "off" season
(summer), pilot assembly may be
dirty.
A. Ensure power supply is plugged in and receiving 120V
AC. Ensure power supply output is 6V DC. Replace all
batteries with known good batteries.
B. Allow time for system to purge air in line. Check the inlet
gas pressure. Make sure it is within the Min/Max. allowable
pressures.
C. Clean or replace the pilot assembly.
D. If a flame lights the pilot, check the electrode gap and
location. The gap should be 1/8" in the flame area.
E. Check for a good connection between ignitor and
electrode. Check wire insulation. If everything is properly
connected and still no spark, replace the DFC Ignition
Module.
F. Clean or replace the pilot assembly.
2. Pilot in CPI mode but
will not stay lit after
carefully following lighting
instructions.
A. Low or too high gas pressure
B. Faulty connections.
C. Pilot dirty or plugged.
A. Check for proper inlet pressure for the fuel gas in use.
B. Check connections on the valve.
C. Clean or replace the pilot assembly.
3. Pilot burning, no gas to
main burner,
ON/OFF/T'STAT or
ON/REMOTE/OFF switch
in the "ON" position.
A. Switch, Thermostat, Receiver,
DFC Ignition Module, or wires
defective.
B. No power and batteries may be
dead.
C. Plugged burner orifice.
A. Check wiring for proper connections. Check components
for proper operation. Place jumper wire across terminals at
thermostat if present. If burner comes on, replace defective
thermostat. If not OK, place jumper across thermostat wires
at gas valve. If burner comes on, tighten connections, or
replace faulty wires.
B. Restore 120V service. Check for proper output of FCM, or
AC adaptor – replace unit if defective. Replace batteries to
ignition system and/or remote receiver.
C. Remove and check burner orifice - clean or replace. Note:
do not use any metal cleaning device, as this may damage
the orifice.
4. Pilot and burner come
on, but go out after some
warm-up.
A. Inconsistent or insufficient
flame on flame rectification
sensor.
B. Insufficient
gas pressure.
C. Excessive
draft.
A. Adjust pilot flame size and assure that the flame is aimed
directly at the rectification sensor.
B. Check line pressure to ensure that the correct inlet
pressure is present for the type of gas being used. If propane
pressure is inconsistent, check for water condensation at the
regulator.
C. Check Restriction settings per this manual.
Summary of Contents for Tucson 8702 DX
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