Hearth and Home Technologies B-Vent Gas Appliance CB4842MIR - Manual (Page 34)

Heatilator • Caliber Mesh BV Series • 4040-848 Rev G • 10/08 34
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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. Intellifi re Ignition System
Symptom Possible Cause Corrective Action
1. Pilot won’t light. The ig-
nitor/module makes noise,
but no spark.
A. Incorrect wiring. Verify “S” wire (white) for sensor and “I” wire (orange) for ignitor are
connected to correct terminals on module and pilot assembly.
B. Loose connections or electrical
shorts in the wiring.
Verify no loose connections or electrical shorts in wiring from module
to pilot assembly. Verify connections underneath pilot assembly are
tight; also verify connections are not grounding out to metal chas-
sis, pilot burner, pilot enclosure, mesh screen if present, or any other
metal object.
C. Ignitor gap is too large. Verify gap of igniter to right side of pilot hood. The gap should be ap-
proximately .17 inch or 1/8 in. (3 mm).
D. Module. Turn ON/OFF rocker switch or wall switch to OFF position. Remove
ignitor wire “I” from module. Place a grounded wire about 3/16 in. (5
mm) away from “I” terminal on module. Place ON/OFF rocker switch
or wall switch in ON position. If there is no spark at “I” terminal mod-
ule 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. Replace pilot if necessary.
2. Pilot won’t light, there is no
noise or spark.
A. No power or transformer in-
stalled incorrectly.
Verify that transformer is installed and plugged into module. Check
voltage of transformer under load at spade connection on module
with ON/OFF switch in ON position. Acceptable readings of a good
transformer are between 3.2 and 2.8 volts AC.
B. A shorted or loose connection
in wiring confi guration or wiring
harness.
Remove and reinstall the wiring harness that plugs into module. Ver-
ify there is a tight fi t. Verify pilot assembly wiring to module. Remove
and verify continuity of each wire in wiring harness. Replace any
damaged components.
C. Improper wall switch wiring. Verify that 110/VAC power is “ON” to junction box.
D. Module not grounded. Verify black ground wire from module wire harness is grounded to
metal chassis of appliance.
E. 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. 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.
3. Pilot sparks, but Pilot will
not light.
A. 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 incorrect. Verify that spark gap from ignitor to pilot hood is .17 in. or 1/8 in (3
mm).
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.