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Old 11-25-2013, 10:15 AM   #1
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Join Date: Mar 2013
Posts: 4
PUP furnace

Hey, my PUP [Flagstaf MAC 228-D] has a furnace in it. I cannot seem to get the heat working. The blower comes on - no heat. Is there a pilot light i'm missing or does this thing have a self-striker to ignite it? Is there a certain temp it has to be at to kick on? My stove works fine so i know i have plenty of propane.

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Old 11-25-2013, 10:59 AM   #2
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Join Date: Nov 2012
Location: X
Posts: 2,781
There's a trouble shooting guide and several other documents for Suburban heaters in the FRF Library. Here's a link to that guide.

You don't say how old your RV is (please consider adding all of that information into your Profile), but it most likely has direct spark ignition (no pilot).

The usual sequence of events is that, when you turn the thermostat on, the blower starts and if the furnace senses enough airflow, it turns on the gas and starts sparking. (You should be able to hear and smell that outside at the heater vent.)

If it doesn't lite, it will try about three times and then lock out. Turn it off at the thermostat to try again.

You may just have air in the gas line so try a few times (assuming you are hearing that spark).

Let us know what you find/hear.

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Old 11-25-2013, 11:05 AM   #3
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Join Date: Jun 2013
Location: Brazoria County, Texas
Posts: 1,265
I had this happen in my last trailer last was just below freezing. I evidently had a little moisture in the gas line. The furnace was the last appliance on the line and just happened to be the lowest point as well. I guess the moisture got pushed to the last bend in the line before it went to the furnace and proceeded to freeze partially blocking the gas line. Everything else worked. When it warmed up, the furnace worked.
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