DIY Home Improvement, Remodeling & Repair Forum > Appliances > HVAC > HVAC blower turns on when system is off




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Old 07-14-2014, 11:54 AM  
carnuck
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A vacuum to remove spider webs helps too.



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Old 09-19-2014, 07:55 PM  
Peterc
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Default Attempting new circuit board

Hi All,
Eventually I found out the "venter blower" is what turns on which in turn points to a short or bad circuit board. I've purchased a new circuit board which contains a 9 pin connector. There is a new 9 pin connector with 5 empty slots for wires from the old connector. PROBLEM is I have not been able to remove wires from the old connector.
QUESTION, can I simply plug in the old connector into the receptacle on the new circuit board. All the wires match but I hate to do this if there is some not too obvious problem doing this.

Picture of original connector attached.

Thanks,
PeterC



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Old 09-19-2014, 10:51 PM  
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Nice to see he came back with what happened ...

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Old 09-20-2014, 05:45 AM  
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If you can't get the connectors off easily I don't see anything wrong with using the old wires and connectors.


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Old 09-20-2014, 12:46 PM  
Peterc
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Thanks,

I'll plow ahead using the original 9 pin connector.

PeterC

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Old 09-22-2014, 07:47 AM  
Raindem
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Funny, but my roof mounted AC/Heater combo unit started doing this last night. But it's more random. Every 2-3 minutes it turns on. Sometimes it runs for a minute, other times just a couple seconds.

So Peter, how did you figure out that it was a circuit board? I have a multimeter but I don't really know where to start looking.

Thanks

Curt

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Old 09-23-2014, 06:33 PM  
Peterc
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1st let me thank everyone as there were bits and pieces of many of the replies that I used to eventually solve my issue. The bottom line is that I have replaced the circuit board and everything works fine. Yesterday I had the A/C on for some time with no problem. Tonight at 50 F the heat seems to be functioning as I would expect.

Thanks to all.

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Old 09-23-2014, 06:47 PM  
Peterc
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Curt,
My problem with the inducer motor turning on when the termostat did not call for heat was always random but became very frequent as time went on. This would happen when the thermostat was in the "off" or "cool" setting. I could not find any tie in with a multimeter except when venter began. I could not trace back to any thing. My testing began with pulling connections but the inducer motor would eventually turn on. After pulling all the connections to the blower motor and pulling the thermostat from the wall, it pointed back to a short and by the process of elimination an HVAC firm was more convinced that it was the circuit board. So for about $100 I decided to do the circuit board because the weather was turning and I had to do something soon.

Any other questions let me know.

PeterC



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