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Old 09-06-2009, 11:31 PM   #31
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blower won't shut off on new gas furnace


Just remember to test the it. I told you how earier. Also you can use an ohm meter and check the SLA to see if it is closed or open. It needs to be closed

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Old 09-07-2009, 11:53 AM   #32
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blower won't shut off on new gas furnace


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I can't figure this out. I have a 2year old gas furnace. The blower won't turn off and I can't find a switch on the furnace like my old one had that can keep the blower always on or off. The only switch is for the lower cover that shuts it off. I am not familiar with this furnace because it is a house that I rent to tenants. I tried an old school t stat and a new digital one with the same results. There are only 2 wires coming from the circuit board right now. The only time it shut off was when I raised the heat and then it turned on again and stayed on. The heat works fine. Is there a switch that I am not seeing on the furnace?
Am I missing something here? He said the heat worked fine if the limit was bad the heat / burners would not operate.
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Old 09-08-2009, 01:42 AM   #33
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blower won't shut off on new gas furnace


I checked the 2 limit switches and tried to push in the button but they seemed to be fine and would not push in. I then took the 2 blue wires off of the SAL and connected them together and the fan would still not turn off. I also let the furnace run through a heating cycle and the fan did not turn off after it got to the set temperature.

Is there any other test I can do to figure this one out?
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Old 09-08-2009, 03:45 AM   #34
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blower won't shut off on new gas furnace


Look at the photo on #16. The two blocks on the right, both of those blocks is a relay that will energize the fan. While the unit isn't in heating mode & fan is still running, tap each relay with a screwdriver handle. It sounds as if you have a sticking relay. If the fan quits, it's likely that relay is the culprit, and the board should be changed. If the appliance is only 2 years, it's probably covered under a warranty.

Unit should not go into heat mode if there was an open limit switch.
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Old 09-08-2009, 04:13 AM   #35
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blower won't shut off on new gas furnace


Hey, on second thought, you should turn the line voltage to the furnace off, then tap on the relays.
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Old 09-08-2009, 07:09 AM   #36
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blower won't shut off on new gas furnace


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Hey, on second thought, you should turn the line voltage to the furnace off, then tap on the relays.
ok I will try that. I did tap on them when the fan was on but I will try with the furnace off.

I will also dig out my reciept for the furnace and see if I still have a warranty.

would it help if I installed the old style T-stat to eliminate the variable of a malfunctioning digital T-stat?

Last edited by johnny67; 09-08-2009 at 10:34 PM.
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Old 09-14-2009, 10:23 PM   #37
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blower won't shut off on new gas furnace


Today the I had the original furnace installer to come check it out. He found a jumper wire was installed by my ex tenant to keep the fan on all the time. The good part is I was not charged a service call fee (he has a dedicated customer now). I guess if I had posted a better picture one of you guys would have spotted that extra wire. Thanks for all the help.

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