| Suburban Furnace NT 30. Irradic ignition [message #268003] |
Mon, 22 December 2014 06:52  |
77Royale
Messages: 461
Registered: June 2014
Location: Mid Michigan
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Senior Member |
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Greetings. I have been using the furnace in my 77 Royale off and on for the last few weeks. Sububan NT 30M. Serial Number 0802246
I removed it when I got the coach, cleaned the burner, blew air through everything and generally cleaned it up, replaced the burner access gaskets, cleaned all the contacts on the control board with a rubber eraser. It has worked fine up until a few days ago. Temps here are in the mid 30s.
I have a full propane tank, and have purged the air by turning the stove burners on. Those work fine.
I have power plugged into Shore.
All 4 ducts are in place and nothing is clogged in either the intake or exhaust tubes.
The blower motor turns on and runs without issue.
When I first come out to the coach and turn the t stat up, the furnace lights up first try, and burns a nice blue flame for proably 30 seconds or so. Then shuts off. I think I hear a very faint "click". It will not re light until it is cooled down.
When it does not want to re light, I can hear the fan blowing and see through the window that there is an arc across the electrodes. So I think the sail switch is not the culprit as my understanding is if the sail switch is faulty or sticking you will not get a spark in an attempt to light.
When the unit is cold, I can shut it off and turn it back on with ignition as many times as I want without issue as long is it does not get too hot. Its just once it burns and gets warm it will go out and not want to light again until completely cool.
Wondering what the consensus here is? Im thinking a bad limit switch?
I have not meter tested any electronics as its kind of a tight space. Just wondering since it will light just fine and burn for a while that it may be a limit switch.
Thanks for the input.
77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson carb and dizzy.
Mid Michigan
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