CHART 2

S8600 (NATURAL GAS AND LP GAS)

INTERMITTENT PILOT SYSTEM TROUBLESHOOTING

SPARK AT PILOT BURNER BUT PILOT WILL NOT LIGHT

Attach wires firmly.

Replace gas valve.

Turn on power supply

Securely connect

cable and/or ground

wire.

Replace pilot burner and/or ground wire.

Carefully bend down- wards top of ground strap to achieve 1/8” spark gap.

Replace pilot burner.

Replace ignition

module.

NO

Ensure all manual shutoff valves are fully open; All filters are clean; All gas connections are gas tight; Pilot tubing is not damaged, obstructed or kinked; and pilot orifice is unclogged. Check for air in gas line, purge (bleed) line if necessary.

NO

 

 

 

 

Are the wires securely attached to the pilot operator on the gas

 

 

control and to the PV & MV/PV terminals on the ignition module?

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

Install a pressure gauge in the pilot tubing line between the gas

NO

control and the pilot burner assembly. Ensure that the pilot

 

adjustment screw (under cap) is adjusted to a position that will

 

 

permit gas to flow.

 

Is pilot gas flowing during ignition attempt?

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

Turn off power supply.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO

Is ignition cable firmly plugged into module?

 

 

 

 

 

Is green ground wire firmly attached to mounting screw

 

and GND terminal on module?

 

 

 

YES

 

 

 

 

 

Is pilot burner ignition cable in good condition (not brittle, burnt, or cracked)?

YES

 

Ensure ground strap is the closest metal to the igniter/sensor

 

rod (electrode) to prevent the spark from shorting out to

NO

other metal parts (pilot screen, pilot shield, etc.).

Ignition cable must not touch metal surfaces or

 

 

current carrying wires.

 

Is there a 1/8” gap between ground strap and electrode?

 

 

 

 

 

YES

NO

 

 

 

 

Are the ceramic insulators surrounding the electrode in good

 

 

condition (not cracked or broken)?

 

 

 

 

 

YES

NO

 

 

Is there excessive draft conditions that may cause pilot

 

burner ignition problems?

 

 

YES

 

 

 

 

Correct draft problems in a manner that would ensure

 

adequate combustion and ventilation air and proper

 

pilot burner performance.

26

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A.O. Smith HW-120M, 225M, 200M Spark AT Pilot Burner but Pilot will not Light, Replace pilot burner Replace ignition Module

HW-120M, 225M, 200M, 160M specifications

A.O. Smith is renowned for its range of advanced water heaters, and the 160M, 200M, 225M, and HW-120M models stand out as some of the most reliable and innovative options available. These water heaters are designed to deliver exceptional performance, energy efficiency, and user-friendly features, making them ideal for various residential and commercial applications.

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