Heatilator NB3630M Owner's Manual page 37

Symptom
4. Pilot sparks, but pilot will
not light.
Possible Causes
A. Correct gas supply.
B. Ignitor gap is too large.
C. Module is not grounded.
D. Module voltage output/
valve/pilot solenoid ohms
readings.
Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07
Corrective Actions
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.
Verify that spark gap from ignitor to pilot hood is .17 in. or 1/8 in.
Verify module is securely grounded to metal chassis of appliance.
Replace module.
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