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15
15
Troubleshooting
With proper installation, operation, and maintenance your gas appliance will provide years of trouble-free service. If you
do experience a problem, this troubleshooting guide will assist a qualifi ed service technician in the diagnosis of a problem
and the corrective action to be taken. This troubleshooting guide can only be used by a qualifi ed service technician. Con-
tact your dealer to arrange a service call by a qualifi ed service technician.
A. Standing Pilot Ignition System
Symptom
1. After repeated triggering
of the red or black piezo
ignitor button, the spark
ignitor will not light the
pilot. Check for spark.
2. The pilot will not stay lit
after carefully following the
lighting instructions.
3. The pilot is burning, there
is no burner fl ame, the
valve knob is in the ON
position, and the ON/OFF
switch is in the ON
position.
Possible Causes
A. No gas or low gas pressure.
B. No LP in tank.
C. Ignitor.
D. Pilot or misaligned electrode
(spark at electrode).
A. Thermocouple.
B. Improper gas inlet pressure.
C. Valve.
A. On/off switch or wires
defective.
B. Thermopile may not be
generating suffi cient
millivoltage.
Heatilator • BCBV36 • 4008-033 • Rev F • 12/08
Corrective Action
Check the remote shut-off valves from the appliance. Usually, there
is a valve near the gas main. There can be more than one valve
between the appliance and the main.
Check the LP (propane) tank. You may be out of fuel.
Check the spark at the electrode and pilot. If no spark and electrode
wire is properly connected, replace the ignitor. Verify that there is no
short in electrode wire.
Using match, light the pilot. If the pilot lights, turn off the pilot and
trigger the piezo ignitor button again. If the pilot lights, an improper
gas/air mixture caused the bad lighting and a longer purge period
is recommended. If the pilot will not light, ensure the gap at the
electrode and pilot is one-eighth inch to have a strong spark. If the
gap is OK, replace the pilot.
Check that the pilot fl ame impinges on the thermocouple. Adjust the
pilot for proper fl ame impingement.
Ensure that the thermocouple connection at the gas valve is fully
inserted and tight (hand tighten plus 1/4 turn).
Verify proper voltage output from the thermocouple to the valve.
Place one millivolt meter lead wire on the thermocouple copper lead.
Place the second lead wire on the solder button on the back of the
valve (blue wire). Start the pilot and hold the valve knob in. The
millivolt reading should read 8-16 millivolts. If millivolt reading is less
than 8 millivolts, replace thermocouple.
Natural gas should be 5-7 in. w.c. LP should be 11-14 in. w.c. Verify
pressure with manometer.
If the thermocouple is producing 8-16 millivolts, replace control valve.
Check the ON/OFF switch and wires for proper connections. Place
the jumper wires across the terminals at the ON/OFF switch. If the
burner comes on, replace the ON/OFF switch. If the switch is OK,
place the jumper wires across the ON/OFF switch wires at the gas
valve. If the burner comes on, the wires are faulty or connections are
bad.
Check that the pilot fl ame impinges thermopile properly.
Be sure the wire connections from the thermopile at the gas valve
terminals are tight and that the thermopile is fully inserted into the
pilot bracket.
Check the thermopile with a millivolt meter. Take the reading at
TH-TP&TP terminals of the gas valve. The meter should read 350
millivolts minimum, while holding the valve knob depressed in the
pilot position, with the pilot lit, and the ON/OFF switch in the OFF
position. Replace the thermopile if the reading is below the specifi ed
minimum.
With the pilot in the ON position, disconnect the thermopile leads
from the valve. Take a reading at the thermopile leads. The reading
should be 350 millivolts minimum. Replace the thermopile if the
reading is below the minimum.
33
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