Coleman Evcon Hot Surface Ignitor Problem

[TIflats]

The HSI on a Mod# G8C10016muc11a keeps failing. I've replaced two in the past 10 months. The temp rise is 66 degrees ,that is within the 40 to 70 degrees that is on the furnace rating plate. The ignitor part is a Norton Mod#271N. The bracket is fixed ,unable to adjust Any tip on what else to check would be greatly appreciated. My boss is loosing his patience with me.

[jwiehagen76]

test applied voltage to ignitor. Check rated voltage of replacement.

[grumpy20716]

What type of air cleaners do they have in the house. I have come to the conclusion that ozone emiting air cleaners damage carbon ignitors

[TIflats]

Got 120V to ignitor thats rated for 120V.Unit has standard filters not electronic.

[grumpy20716]

What about portable air purifiers in house?

[graybones]

If the HSI is a "tunning fork" style, switch to a double helix style. They are more durable and concidered heavy duty. There is a universal version that works for most furnaces.

[jrbenny]

What is the location of the unit (laundry room, mechanical room, basement, etc.)?

[DOGBOY]

you are not touching the glowing end of the ignitor with your oily fingers are you?

[Moose]

Check your airflow - 66F temp rise is close to max - unit may be limiting, causing cycling of ignition system, or unit overfired. Also... see DOGBOY advice.

[superheatrman]

http://www.white-rodgers.com/wrdhom/pdfs/sell_sheets/wr_7071_1_21D64_2_NitrideMod_SS.pdf
these will last ... even if you touch it, or if you have a electronic ozone generating device. or if your furnace is short cycling on temp rise, due to low airflow across the heat x, and a over fired burnners...Get the temp rise down. furnaces are not designed to cycle on the high limit switch.

[TIflats]

Unit is located in a basement utility rm. 10ft.from the laundry area.Has lovered door.Have been replacing w/o touching SC end.I'm am going to upgrade the ignitor and work on getting the temp rise down.Thanks for the info.

[heaterman]

With the temp rise being on the upper side of the permitted limits, you could be experiencing a short cycling issue although 10 months still seems extremely short for the ignitor life cycle. Contamination of the ignitor surface is also viable but here again, unless the intake air is extremely "dirty" 10 months is extreme. Possibly got a couple of ignitors that were compromised in some way. While the claim is that you can handle the ignitor surface with not ill effects, common sense dictates that you avoid this activity. There is no reason to handle the igntor in this fashion for that matter. If you loose another ignitor in a short period of time, have the temp rise examined closer and possibly have the ignitor upgraded to a nitride unit.