User Manual

Form 43471010
-44- Dec 2017
21.4) IGNITION SYSTEM CHECKS
TO CHECK IGNITION CABLE.
a. Make sure that the ignition cable does not touch any metal surface.
b. Make sure that connections to the stud terminal and the igniter/sensor are clean and tight.
c. Make sure that the ignition cable provides good electrical continuity.
TO CHECK IGNITION SYSTEM GROUNDING.
(Nuisance shutdowns are often caused by a poor or erratic ground.) A common ground is required for the module,
igniter, flame sensor and main burner.
a. Check for good metal-to-metal contact between the igniter bracket and the main burner.
b. Check the ground lead from the GND (BURNER) terminal on the module to the igniter bracket. Make sure
connections are clean and tight. If the wire is damaged or deteriorated, replace it.
c. Replace igniter/sensor with factory replacement part if insulator is cracked.
TO CHECK SPARK IGNITION CIRCUIT.
▲WARNING: The ignition circuit generates a 20,000 Volt open circuit and electrical shock can result.
a. Check ignition cable.
b. Check external fuse located inside the control box.
c. Verify power (24V) at module input terminals and output terminal to gas valve.
d. Replace spark module if fuse and power are OK.
IGNITION MODULE DIAGNOSTICS (Fenwal #35-6087J1-034 module only)
The LED located on the ignition module will flash ON for ¼ second, then OFF for ¼ second during a fault
condition. The pause between fault codes is 3 seconds.
LED Indication
Error Mode
Steady On
Internal Control Fault
2 Flashes
Flame Sense Fault
3 Flashes
Ignition Lockout
TO CHECK FLAME SENSOR CIRCUIT (Fenwal #35-6087J1-034 module only)
The flame current is the current that passes through the flame from the sensor to the ground. The
minimum flame current necessary to keep the system from lockout is 0.7 micro-amps.
a. To measure the flame current, connect an analog DC micro-ammeter to the FC- and FC+ terminals per
diagram. The meter should read 0.7 micro-amps or higher when the burner is running full on.
b. If the meter reads below zero, the meter leads are reversed. Disconnect power and reconnect the meter
leads for proper polarity.
c. Remove micro-ammeter. Return system to normal operation.