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Heatilator • Caliber CD Series • 4040-263 Rev N • 11/08 57
A. Standing Pilot Ignition System
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.
Symptom Possible Causes Corrective Action
1. After repeated triggering
of the red or black piezo
ignitor button, the spark
ignitor will not light the
pilot. Check for spark.
A. No gas or low gas pressure. 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.
B. No lp in tank. Check the LP (propane) tank. You may be out of fuel.
C. Ignitor. 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.
D. Pilot or misaligned electrode
(spark at electrode).
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.
2. The pilot will not stay lit
after carefully following the
lighting instructions.
A. Thermocouple. 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.
B. Improper gas inlet pressure. Natural gas should be 5-14 in. w.c. LP should be 10-14 in. w.c.
Verify pressure with manometer.
C. Control valve. If the thermocouple is producing 8-16 millivolts, replace control
valve.
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.
A. On/off switch or wires
defective.
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.
B. Thermopile may not be
generating suffi cient
millivoltage.
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.