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Constantly running furnace fan

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Subject Author Date
Constantly running furnace fan Mike Dobony 05-12-2007
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Posted by Mike Dobony on May 12, 2007, 4:32 pm
I have an Intertherm MGHA-056 in my mobile home that is constantly running
even with neither the air conditioning nor the heat on. I disconnected the
wires to the thermostat and it is still running. Any ideas on what is going
on?

Mike D



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Posted by RBM on May 12, 2007, 4:41 pm
If you can find where the thermostat wires are connected in the blower unit,
try disconnecting the wire that controls the fan, which is usually green.
This would prove the wiring from the unit to the thermostat




>I have an Intertherm MGHA-056 in my mobile home that is constantly running
>even with neither the air conditioning nor the heat on. I disconnected the
>wires to the thermostat and it is still running. Any ideas on what is
>going on?
>
> Mike D
>



Posted by Mike Dobony on May 12, 2007, 4:50 pm

> If you can find where the thermostat wires are connected in the blower
> unit, try disconnecting the wire that controls the fan, which is usually
> green. This would prove the wiring from the unit to the thermostat
>

Do you mean the thermostat wire connections inside the furnace or the wires
on the blower itself? I already disconnected the wires from the furnace
inside the furnace.

>
>
>
>>I have an Intertherm MGHA-056 in my mobile home that is constantly running
>>even with neither the air conditioning nor the heat on. I disconnected
>>the wires to the thermostat and it is still running. Any ideas on what is
>>going on?
>>
>> Mike D
>>
>
>



Posted by RBM on May 12, 2007, 5:22 pm
Yes, the thermostat wires inside the blower, specifically the "G" wire,
which should control the fan relay


>
>> If you can find where the thermostat wires are connected in the blower
>> unit, try disconnecting the wire that controls the fan, which is usually
>> green. This would prove the wiring from the unit to the thermostat
>>
>
> Do you mean the thermostat wire connections inside the furnace or the
> wires on the blower itself? I already disconnected the wires from the
> furnace inside the furnace.
>
>>
>>
>>
>>>I have an Intertherm MGHA-056 in my mobile home that is constantly
>>>running even with neither the air conditioning nor the heat on. I
>>>disconnected the wires to the thermostat and it is still running. Any
>>>ideas on what is going on?
>>>
>>> Mike D
>>>
>>
>>
>
>



Posted by Mike Dobony on May 12, 2007, 5:39 pm

> Yes, the thermostat wires inside the blower, specifically the "G" wire,
> which should control the fan relay
>

I already did that. It just keeps running and running and running. The A/C
turns on and off just fine, but hte blower just keeps running and will not
shut off.

There is a Cool/Heat switch on the furnace itself. When I had it on Cool it
did this also so I just leave it on Heat. I have no manual on this thing
and can't seem to find it on the internet. The Intertherm site does not
have any email address for any kind of customer service.
>
>>
>>> If you can find where the thermostat wires are connected in the blower
>>> unit, try disconnecting the wire that controls the fan, which is usually
>>> green. This would prove the wiring from the unit to the thermostat
>>>
>>
>> Do you mean the thermostat wire connections inside the furnace or the
>> wires on the blower itself? I already disconnected the wires from the
>> furnace inside the furnace.
>>
>>>
>>>
>>>
>>>>I have an Intertherm MGHA-056 in my mobile home that is constantly
>>>>running even with neither the air conditioning nor the heat on. I
>>>>disconnected the wires to the thermostat and it is still running. Any
>>>>ideas on what is going on?
>>>>
>>>> Mike D
>>>>
>>>
>>>
>>
>>
>
>



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