View single post by hvacdrd
 Posted: Fri Feb 8th, 2008 06:13 pm
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hvacdrd



Joined: Wed Aug 16th, 2006
Location: Michigan USA
Posts: 1186
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 The pilot sensor is a bi-metal switch that makes and breaks a set of contacts as it heats up.

Using a volt-meter, test from Yellow to White at the 3-wire pilot switch molex connector(still connected). Voltage should be 24VAC on the initial call for heat then switch to 0VAC after 45-60 seconds, then the main gas valve is energized. If the reading stays at 24VAC then the bi-metal switch is not closing properly.

Removing the pilot assembly & cleaning the pilot hood and orifice should may take care of it. If not replace the 3-wire pilot assembly.

As always only perform the work if you are confident that you can recognize and repair potential hazards.



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