Heatilator CNXT4236IH CNXT4842IH, Owner'S Manual

Page: 60 / 92

60 Heatilator • Caliber CNXT Series • 4047-132 Rev P • 11/07
Symptom Possible Causes Corrective Actions
3. Pilot lights but continues
to spark, and main burner
will not ignite. (If the pilot
continues to spark after
the pilot
fl ame has been
lit, fl ame recti fi cation has
not occurred.)
A. A shorted or loose
connection in sensor rod. Verify all connections to wiring diagram in manual. Verify connections
underneath pilot assembly are tight. Verify connections are not grounding out
to metal chassis, pilot burner, pilot enclosure or screen if present, or any other
metal object.
B. Poor fl ame recti fi cation or
contaminated sensor rod.
Verify fl ame is engul fi ng sensor rod. If the pilot assembly does not have a
ground strap, consider installing one to increase fl ame recti fi cation. Verify
correct pilot ori fi ce is installed and inlet gas speci fi cations are met. Flame
carries recti fi cation current, not the gas. If fl ame lifts from pilot hood, the
circuit is broken. A wrong ori fi ce or too high an inlet pressure can cause pilot
fl ame to lift. The sensor rod may be contaminated. Clean sensor rod with
emery cloth.
C. Module is not grounded. Verify that module is securely grounded to metal chassis of appliance. Verify
that the wire harness is
fi rmly connected to module.
D. Damaged pilot assembly
or dirty sensor rod. Verify that ceramic insulator around the sensor rod is not cracked, damaged,
or loose. Verify connection from sensor rod to white sensor wire. Clean
sensor rod with emery cloth to remove any contaminants that may have
accumulated on sensor rod. Verify continuity with a multimeter with ohms set
at lowest range.
E. Faulty module. Turn ON/OFF rocker switch or wall switch to OFF position. Remove ignitor
wire “I” from module. Place ON/OFF rocker switch or wall switch in ON
position. Hold ground wire about 3/16 in. away from “I” terminal on module. If
there is no spark at “I” terminal, module must be replaced. If there is a spark
at “I” terminal, module is
fi ne. Inspect pilot assembly for shorted sparker wire
or cracked insulator around electrode.
4. Pilot sparks, but pilot will
not light. A. Correct gas supply. Verify that incoming gas line ball valve is “open”. Verify that inlet pressure
reading is within acceptable limits, inlet pressure must not exceed 14 in. w.c.
B. Ignitor gap is too large. Verify that spark gap from ignitor to pilot hood is .17 in. or 1/8 in.
C. Module is not grounded. Verify module is securely grounded to metal chassis of appliance.
D. Module voltage output/
valve/pilot solenoid ohms
readings. Verify battery voltage is at least 2.7 volts. Replace batteries if voltage is below
2.7.