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Rheem Power Vent Mod# 21VP50-1P wont ignite

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Wife took a shower this evening and all was well until we went to bed.  I could hear the fan on the power vent running continuosly.  After a while I knew is should have completed a cycle and got up to investigate.  Found the the glow plug isn't lighting.  My multimeter has a bad lead on it such that I can't reliably measure voltage :( However, i was able to determine that the glow plug has continuity.  However, it looks like it has very low ohms, on the order of 50.  I would have thought it  would have been a little higher.

My uneducated guess says that either the ignition control module is bad or the glow plug is shorted.  Can someone tell me how many ohms to expect on the glow plug?

Am I even barking up the right tree?

I should also note that the vaccume switch is closing properly.  I even tried bypassing it just be be completely certain.  Any help or comments appreciated.



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