Grandaire packaged unit blower runs constantly


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Old 01-05-19, 05:14 AM
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Grandaire packaged unit blower runs constantly

I have a Grandaire model WJA430000KTP0A1 packaged heating and air system .My blower runs constantly no matter whT the thermostat is set at .I have disconnected the green wire from the thermostat and blower keeps running. Everything else seems to work the way it should if I have it set to cool it all comes on when it should and when temp is attained the cooling shuts off same as if I have it set to heat it all comes on and when temp is attained the heating shuts off but blower keeps running. So what should I check next
 
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Old 01-05-19, 09:40 AM
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Welcome to the forums.

I'm trying to find a technical manual for that ICP built product.
It looks like that uses an expensive variable speed electronic motor called an ECM-X13. It's programmed with multiple speeds. That type of motor is connected directly to 240v and then low voltage signals are sent over to it to select the speed program.

How old is this unit ? Possibly still under warranty.
 
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Old 01-05-19, 10:04 AM
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Hi

I'm not sure if still under warranty This unit was here when we moved in and from what I have read Grandaire warranty is only for the original owner
 
 

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