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 > Atwood 7916 intermittent lighting

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jfdemars

California

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Posted: 01/02/20 12:40pm Link  |  Quote  |  Print  |  Notify Moderator

My Atwood 7916 furnace will light sometimes but then not other times. It will try to light 3 times (3 clicks of the igniter) after which the blower will blow cold air until I turn the thermostat off. Sometime later I will turn the thermostat on then the furnace will light on the 3rd igniter click and then heat well until the thermostat shuts it off. Sometimes when the thermostat turns it back on it will light and sometimes it will not light. Sometimes if will cycle on and off several times heating well, ultimately it will fail to light. What could be the problem?

- failing igniter
- failing circuit board
- failing regulator (cooking stove has great prssure)

Thanks in advance for any ideas!!

Chris Bryant

Arden, North Carolina

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Posted: 01/02/20 12:43pm Link  |  Quote  |  Print  |  Notify Moderator

I would start by cleaning, checking burner, electrodes and orifice.


-- Chris Bryant

enblethen

Moses Lake, WA

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Posted: 01/02/20 02:21pm Link  |  Quote  |  Print  |  Notify Moderator

Dirty furnace! Blow it out good with compressor or canned air. Locate your sail switch and blow that area out good.


Bud
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DFord

Near St Louis, MO

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Posted: 01/02/20 04:58pm Link  |  Quote  |  Print  |  Notify Moderator

RV furnaces try 3 times to "prove" the flame. Yours having trouble proving and measuring the flame. There is a flame rod in the flame that conducts a very small DC current as long as the flame is established. As quickly as that signal is no longer present, the sensors on the control board kill power to the gas valve and safety off to prevent unburned gas from collecting which could cause an explosion. Your furnace is doing exactly what it's supposed to be doing. You need to figure out why or hire someone knowledgeable to fix it.


Don Ford
2004 Safari Trek 31SBD (F53/V10 20,500GVW)
'09 HHR 2LT or '97 Aerostar MiniVan (Remco driveshaft disconnect) for Towed vehicles
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BFL13

Victoria, BC

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Posted: 01/02/20 06:16pm Link  |  Quote  |  Print  |  Notify Moderator

My older 8531 did that. It turned out the "burner" (you have to unscrew a few things to get at it back in there--see a youtube) --use a magnetic screwdriver or go insane--was the culprit. It is tongue-shaped sticking out the back, with a screen on top of the tongue above where the flame comes out, and below the sparker set.

My screen (supposed to have a bunch of little holes in it) was rusted badly and had a big opening instead of a screen for part of it. That made the flame come up unevenly instead of properly through an intact screen, so the flame sensor got confused I think.

You could get a similar effect from just needing cleaning as already mentioned. Also wasp nests. As they said above, take it all out and see if it is anything obvious. While it is all apart now is a good time to clean out the propane line to the burner and the orifice sprayer hole --not with a pin!--see the maintenance instructions and a you tube for that.


1. 1991 Oakland 28DB Class C
on Ford E350-460-7.5 Gas EFI
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2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
See Profile for Electronic set-ups for 1. and 2.

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