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Old 02-26-2014, 08:08 PM   #1
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Heater won't stay lit.

My dolphin mh has a Atwood 8531 heater that lights and goes out. Tries 3times then get 3 blinking lights on the control board. I read that means ignition lockout fault. Any help appreciated.
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Old 02-26-2014, 08:15 PM   #2
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1 or 2 things no gas being sipplied or needs new igniter and supply valve prolly all in 1 unit if its old better invest in the part easy install better safe then sorry
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Old 02-26-2014, 08:16 PM   #3
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If you heater has a DSI (direct spark ignition) it's likely the flame sensor. If it's the flame sensor it will only burn for a few seconds before the defective flame sensor shuts the gas off. Hope this helps you.
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Old 02-26-2014, 08:46 PM   #4
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Where is the flame sensor located? It does light for a few seconds, the quits
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Old 02-26-2014, 08:51 PM   #5
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if it is indeed lighting then the gas valve is working, tend to agree with Kix and would suspect the flame sensor. There is also a sail switch that senses when the fan is blowing enough air and will then allow ignition, if the sail switch is bad the furnace will come on but only blow cold air with no ignition for about 30 seconds, try again two more times and then lock out. You need to make sure the gas is or is not igniting before the furnace locks out and that should point you in the right direction for the fix.
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Old 02-26-2014, 08:54 PM   #6
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Here's what's happening:
T-stat calls for heat, sends signal to furnace. Furnace takes over from there.
Fan kicks on. Sail switch closes and sends signal that enough air flow is present.
Simultaneously, the gas valve opens, sending LPG to the burner chamber and the ignitor starts sparking.
This is where you need to check; if you can hear ticking, feel heat and smell LP from the outside exhaust vent, all that is working properly.
If that is the case, you have a few things that could be wrong: bad flame sensor in the burner chamber, bad wire/connection to the sensor, bad control board not sensing flame, or a bad flame in the chamber. Bad flame can be from low LP pressure, bad burner screen, or something blocking air/LP flow in the chamber.
Most likely, it all needs to be removed and cleaned out.
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Old 02-26-2014, 08:54 PM   #7
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The flame sensor is found by looking at the pilot light flame area. You'll see a wire bent at 90 degrees that the pilot flame impinges on. this is the flame sensor......just follow to the connection.
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Old 02-26-2014, 08:56 PM   #8
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Jesilvas has a better idea than replacing parts first.
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Old 02-26-2014, 11:13 PM   #9
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I would take it to a lp service center and bite the bullet, don't tinker with your lives especially if you don't have the knowledge. Just Sayin
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Old 02-27-2014, 05:33 PM   #10
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furnace diagnostic at Camping World is $75. at least you will know what s the real problem.
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Old 02-27-2014, 06:59 PM   #11
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Problem solved. New circuit board needed. Thanks to Drakes RV for a quick fix.
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