Atwood Hydro Flame FA7916 problem. - Fiberglass RV
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Old 09-25-2023, 06:47 PM   #1
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Name: Tom / Heather
Trailer: Bigfoot
Manitoba
Posts: 3
Atwood Hydro Flame FA7916 problem.

HI All,
I have searched through previous postings and have tried to find a solution but I either have missed it, or have not gone in deep enough.
I have an 1990 Atwood Hydro Flame model FA7916 D. The problem is that the furnace will not ignite. I have purged the gas lines ( lit all stove burners and let them run for a few minutes), turned on the thermostat, cranked it up to high. The fan starts up in 10 or so seconds and , while outside by the exhaust port, I can hear the igniter clicking and smell some of the propane. But when the igniter stops clicking, there is no ignition and no heat coming out of the port.
I understand that if the airflow is not right, the sail switch will not allow the gas to flow and the ignitor to spark so hearing the clicking and smelling the gas, I assume the sail switch is functioning properly. I have taken the cover off and exposed the ignitor module. I removed the ignitor and covered the hole with tape to prevent gas escape. I left the ignitor connected and restarted the furnace. Fan came on and about 10 or so seconds later, the ignitor started sparking (strongly). I put the unit back together again and retried the operation but again, fan came on, igniter sparked, whiff of propane came out the exhaust but no ignition.
Any idea what else could be causing the lack of ignition?
Thanks,
Tom
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Old 09-25-2023, 06:56 PM   #2
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Trailer: Boler 13 ft
Posts: 2,040
Spark igniter is not where gas is coming out of tube????
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Old 03-09-2024, 08:04 PM   #3
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Name: John
Trailer: 2001 Bigfoot 21ft
98022
Posts: 1
Try the sail switch.

I had trouble with a different Atwood furnace. Sometimes I would get a few seconds of ignition and sometimes nothing. So I was sure it couldn't be the sail switch because I thought the sail switch would prevent that momentary release of propane and momentary ignition. But a service person at RV Country in Buckley, WA told me a bad sail switch could still allow momentary flow of gas and momentary ignition. So I replaced the sail switch. I still had intermittent firing. So I removed the igniter and grounded it, turned off the gas (instead of taping over the exhaust) and started the furnace. I could see that the spark was weak or non-existent. I replaced the igniter and that solved my problem.
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