Hearth and Home Technologies B-Vent Gas Appliance CB4842MIR - Manual (Page 35)

Heatilator • Caliber Mesh BV Series • 4040-848 Rev G • 10/08 35
A. Intellifi re Ignition System (continued)
4. 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 rectifi cation has not
occurred.)
A. A shorted or loose connection
in fl ame sensing rod.
Verify all connections to wiring diagram in manual. Verify connec-
tions 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 rectifi cation or con-
taminated fl ame sensing rod.
With fi xed glass assembly in place, verify that fl ame is engulfi ng
fl ame sensing rod on left side of pilot hood. Flame sensing rod
should glow shortly after ignition. Verify correct pilot orifi ce is in-
stalled and gas inlet is set to pressure specifi cations. Clean fl ame
sensing rod with emery cloth to remove any contaminants that may
have accumulated on fl ame sensing rod.
C. Module is not grounded. Verify module is securely grounded to metal chassis of appliance.
Verify that wire harness is fi rmly connected to the module.
D. Damaged pilot assembly or
contaminated fl ame sensing
rod.
Verify that ceramic insulator around the fl ame sensing rod is not
cracked, damaged, or loose. Verify connection from fl ame sensing
rod to white sensor wire. Clean fl ame sensing rod with emery cloth to
remove any contaminants that may have accumulated on fl ame sens-
ing rod. Verify continuity with a multimeter with ohms set at lowest
range. Replace pilot if any damage is detected.
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.
5. The pilot and main burner
extinguish while in opera-
tion.
A. No LP in tank. Check the LP (propane) tank. Refi ll the fuel tank.
B. Improper gas inlet pressure. Verify with manometer. NG should read 5-14 inches w.c. LP should
read 10-14 inches w.c.
C. Inner vent pipe leaking exhaust
gases back into the system.
Check venting system for damage. Replace/repair improperly as-
sembled pipe sections.
D. Glass installed improperly. Check to ensure glass is installed properly. Replace glass panel as-
sembly.
E. Improper vent cap installation. Check for proper installation and freedom from debris or blockage.
F. High limit switch has been au-
tomatically activated.
This appliance is equipped with an auto reset high limit switch which
will shut down the appliance if it spills under fl ue blockage or exces-
sive negative pressure conditions. Shut off the appliance and the gas
supply. Do not attempt to operate the appliance until it has been ex-
amined by a qualifi ed service technician.