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Old 11-01-2011, 12:00 PM  
tvandame
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Default Honeywell smart valve

I have a Armstrong Ultra sx80 model #S8400C30919 natural gas furnace. It has the third Honeywell contol valve SV9502H2522 smart valve. Every time that the valve is replaced, it works flawlessly for 6 months. When it does noy work here is the sequence. Thermostat calls for heat, the blower starts for clearing excess gas, done! It just runs until I shut off the thermostat and try again. Same! All three times that the valve was replace it worked. Any suggestions would help. Next step is a new furnace!

Thanks, Tom



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Old 11-01-2011, 01:53 PM  
paul52446m
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Default Honeywell smart valve

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Originally Posted by tvandame View Post
I have a Armstrong Ultra sx80 model #S8400C30919 natural gas furnace. It has the third Honeywell contol valve SV9502H2522 smart valve. Every time that the valve is replaced, it works flawlessly for 6 months. When it does noy work here is the sequence. Thermostat calls for heat, the blower starts for clearing excess gas, done! It just runs until I shut off the thermostat and try again. Same! All three times that the valve was replace it worked. Any suggestions would help. Next step is a new furnace!

Thanks, Tom
HVAC repair questions? Ask an HVAC technician ASAP Try this. Paul


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Old 11-02-2011, 05:48 AM  
hvactechfw
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answer, its a smart (dumb) valve problem!!! Those things are junk and are known to have problems constantly. I'm not sure how old your furnace is, but those are known for cracked heat exchangers as well. I've seen them crack as early as 3 years old.

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Old 11-03-2011, 05:41 AM  
tvandame
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The heat exchanger looks like it had been spit and polished. There is no vibration on the valve. Do they naturally go bad in 6 months? Can it be replaced with a different valve?

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Old 11-03-2011, 07:37 AM  
hvactechfw
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Smart valves go bad a lot. No. You can not replace it with a regular gas valve. I'd you don't don't know where to look and what to look for you will easily miss a heat exchanger issue. Best to call a pro for heat exchanger verification.

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Old 12-19-2011, 05:21 PM  
ricky
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Default on third honeywell smart valve since 2008 on armstrong sx80 furnace

i am on my third valve since 2008 tech says must be power surge causing problem i never had trouble before 2008 furnace is about 12 years old sould i buy new furnace

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Old 12-20-2011, 04:05 PM  
hvactechfw
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you might consider a new furnace. Furnace's with smart valves seem to be made on the cheap, I would steer clear of any furnace with a smart valve for your replacement furnace.

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Old 12-23-2011, 01:17 PM  
norman
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What kind of valve can I use to replace it ( the Honeywell )

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Old 12-23-2011, 02:02 PM  
hvactechfw
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What kind of valve can I use to replace it ( the Honeywell )
If you have a honeywell "smart valve" then you have no choice but to replace it with a "smart valve" because its not just a gas valve, its also the ignition controller.


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