35
A-1. Intermittent Pilot
Ignition System Checks
STEP 1:
Check ignition cable.
a. Verify ignition cable does not make contact with
metal surfaces.
b. Verify only factory supplied Ignition cable (or
approved replacement) is used.
c. Verify connections to ignition module and igniter or
igniter-sensor are clean and tight.
d. Verify ignition cable provides good electrical
continuity.
STEP 2:
Verify ignition system grounding. Nuisance shutdowns are
often caused by poor or erratic grounding.
Common ground is required for module and pilot burner/
igniter sensor.
‒
Check for good metal-to-metal contact between pilot
burner bracket and the main burner.
‒
Check ground lead from GND (BURNER) terminal
on module to pilot burner. Verify connections are
clean and tight. If wire is damaged or deteriorated,
replace with No. 14-18 gauge, moisture-resistant,
thermoplastic insulated wire with 105°C [221°F]
minimum rating.
‒ Check ceramic flame rod insulator for cracks or
evidence of exposure to extreme heat, which can
permit leakage to ground. Replace pilot burner/
igniter sensor and provide shield if necessary.
‒ If flame rod or bracket is bent out of position,
restore to correct position.
APPENDIX A - CONTROL FUNCTION
DANGER
Carbon Monoxide Hazard:
If the burner fires
when the vent damper is not fully opened or there is
any other blockage in the flue, dangerous flue
products, such as carbon monoxide, will escape into
the living space causing severe personal injury or
death. The flue as well as the vent damper must be
checked for proper operation before allowing the
system to operate.
!
3
2
V-PWR
Indicates power has been sent to the vent
damper.
LIMITS
illuminates on a call for heat to indicate the
external limits are satisfied. (External limits may
include flame rollout, spill switch, secondary low
water cut-off etc.). If the external limits are open, the
LIMITS light will blink.
Ignition - LED Legend
1
V-SW
Illuminates when the vent damper switch an
has made. If the damper end switch fail to make in 30
seconds, the V-SW light will blink.
4
FLAME
Illuminates when the pilot flame is lit. If the
pilot flame is not sensed within 75 seconds or if flame
is lost, the FLAME light will blink.
PN 240013268 Rev. D [08/15/2021]
