Hearth & Home Technologies SL-550TV-IPI-D User Manual

37

Heat & Glo  •  SL-550 / 750 / 950TV-D  •  2053-985 Rev. H  •  9/06

1. The ignitor/
module makes 
noise, but no 
spark.

a. Incorrect wir-
ing.

Verify “S” wire (white) for sensor and “I” wire (orange) for ignitor are con-
nected to correct terminals on module and pilot assembly. Reversed wires 
at the module may cause system to make sparking noise, but spark may 
not be present at pilot hood.

b. Loose connec-
tions or electri-
cal shorts in the 
wiring.

Verify no loose connections or electrical shorts in wiring from module to pi-
lot assembly. Rod closest to pilot hood is ignitor. Verify connections under-
neath pilot assembly are tight; also verify connections are not grounding 
out to metal chassis, pilot burner, pilot enclosure, mesh screen if present, 
or any other metal object. 

c. Ignitor gap is 
too large.

Verify gap of igniter to pilot hood. The gap should be approximately .17 
inch or 1/8 inch.

d. 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 inch away from “I” terminal on mod-
ule. 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.

2.  Pilot won’t 
light, there is no 
noise or spark.

a.  Transformer 
installed correctly.

Verify that transformer is installed and plugged into module. Check volt-
age 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 gu-
ration or wiring 
harness.

Remove and reinstall the wiring harness that plugs into module. Verify 
there is a tight fi t. Verify pilot assembly wiring to module. Remove and 
verify continuity of each wire in wiring harness. 

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 fi rmly to 
metal chassis of appliance.

e.  Faulty mod-
ule.

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 inch away from “I” terminal on mod-
ule. 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 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 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 
rectifi cation or 
contaminated 
sensor rod. 

Verify that fl ame is engulfi ng sensor rod. If the pilot assembly does not have 
a ground strap, consider installing one to increase fl ame rectifi cation. Verify 
correct pilot orifi ce is installed and inlet gas specifi cations. Flame carries rec-
tifi cation current, not the gas. If fl ame lifts from pilot hood, the circuit is bro-
ken. A wrong orifi 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 wire harness is fi rmly connected to module.