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Vulcan 5310011 external ducted heater more often than not wont light, 3 of the 4 burners light but when the 4th one doesn't the unit shuts down. When the 4th one does light there is a small sensor of some description in the flame, one on the left burner and one on the right burner. The one on the right which doesn't light most of the time glows red when it does light and the one on the left doesn't glow red, unsure of what this "sensor" is? I am a plumber by trade but don't do anything with ducted heaters. Any help would be appreciated.

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Posted on Jan 02, 2017

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22yooper
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SOURCE: I have a Coleman Patio

The primary air adjustment is located at the burner inlet. To little air and you have yellow flame. To much primary air and you get flame lift off from the burner. The adjustment may be locked in position by a screw. To change the adjustment you must loosen the locking screw.

Posted on Sep 14, 2008

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SOURCE: Glow plug ignites flame but

there is a white\or silver flame sensor in the middle of the furnace it hangs down into where the gas goes out of the tubes,clean it with a piece of sand cloth try not to touch it with your fingers after the oil in your skin can "fool" it if it still doesnt work replace the sensor that should take care of your problem a new sensor should run 20 to30 dollars

Posted on Oct 14, 2008

meBNme
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SOURCE: Weather King 8PJ10NDR01 When I

The gas valve is not sensing flame, and the unit shuts down on safety.

Chances are the flame sensor is bad, its a common problem.

If its a thermocouple you can buy one for 10 bucks, If its a newer style they can usually be had for less than 30.

They are easy to replace ad they are usually installed with two screws and one to two wires.

They sit directly in the flame pattern in front of the burners.

A service call should only cost you 250 or less for the repair, but you can do it yourself for less than 50 (including gas to drive to the HVAC supply house that sells your brand unit.)

You will need the model and serial #s when locating the parts.

Posted on Dec 27, 2008

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SOURCE: ruud silhouette #UHDG-07EAUER won't heat house

Cleaning the flame sensor has nothing to do with blower motor not turning on. You either one of the following problems 1 bad cap for motor. 2 bad motor. 3 bad limit on blower housing or 4 a bad board. You will need a volt meter to check for these problems. Try seeing if the fans runs with unit of and fan switch turned to on. Also does motor hummmm. Is motor cage free ( can check by manually turning) If motor doesnt humm and the cage is free wheeling then you will need to find out if you have power going to the motor. If you find out that you do then you will need to change blower motor. If you do not have power then you will need to check limit with continuity tester on volt meter. If that checks fine only 1 thing can be wrong and that is the board.

Posted on Feb 16, 2009

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SOURCE: gas heater won't work

Which flame sensor did he replace? The pilot flame or the plenum temp. sensor.

Posted on Aug 10, 2009

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