Through-the-wall 20kBTU propane furnace

Old 11-16-13, 02:45 PM
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Through-the-wall 20kBTU propane furnace

Replaced a faulty gas valve in an old Dynavent through-the-wall propane furnace and now it gets really hot. I stuck a thermometer in the grill guard and after 10 minutes it was up to 205 dg F.
I noticed the limit switch didn't activate to shut off the gas. Went outside and felt the bottom of the furnace and felt under the casing and it was so hot especially where the burner is located I couldn't hold my hand there long.
Looking thru the burner window the ribbon on the burner has the blue points but there is a larger yellow flame burning in there too. Took out the burner and it looks ok, no corrosion.
Is this a normal temp for these small heaters? When I first got it in 1997 I don't remember it getting so hot.
Old 11-16-13, 07:30 PM
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Most limit switches are marked with a temperature. I suggest you remove yours & check it. It would probably be a good idea to get a professional service person to look at the heater & inspect it for safety.

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