Hearthstone Quality Home Heating Products, Inc
Bristol DX Model 8763
43
Troubleshooting
Symptom
Possible Cause
Corrective Action
1. Pilot will not light.
A. Optional 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 igniter
element in pilot assembly.
E. Defective igniter.
F. After sitting for "off" season
(summer), pilot assembly may be
dirty.
G. ON/OFF Switch in “OFF”.
A. Ensure power supply is plugged in and receiving 120V
AC. 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 igniter and
electrode. Check wire insulation. If everything is properly
connected and still no spark, replace the Ignition Module.
F. Clean or replace the pilot assembly.
G. Turn switch to ‘ON’ position.
2. Pilot in Manual or
Standby mode and will not
stay lit after carefully
following lighting
instructions.
A. Low or too high gas pressure
B. Faulty connections.
C. Pilot dirty or plugged.
D. Thermocouple damaged.
E. Thermocouple Interrupter circuit
damaged.
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.
D. Check for appropriate MV at thermocouple interrupter.
E. Check thermocouple interrupter circuit for damage or
loose connections.
3. Pilot burning, no gas to
main burner.
A. Gas control system may be
damaged.
B. No power and/or batteries may
be dead.
C. Plugged burner orifice.
A. Check wiring for proper connections. Check components
for proper operation. Check for appropriate MV output from
thermocouple and check connections at thermocouple
interrupter.
B. Restore 120V service or replace batteries in 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 draft.
B. Insufficient gas pressure.
C. Excessive draft.
A. Check flue for blockage or other damage to venting.
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.
