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Open Roads Forum  >  Tech Issues

 > Furnace Problem

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harry and thea

ontario, canada

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Posted: 10/11/17 02:27pm Link  |  Quote  |  Print  |  Notify Moderator

Suburban NT-30SP. Still trying to diagnose my intermittent furnace problem. Want to make sure my thermostat is ok. I get instant fan when I turn the thermostat up. Is this normal? This model furnace does not have a time delay relay on it. Should there be one in the thermostat?


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darsben1

near Canada in NYS/ Casa Grande, AZ

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Posted: 10/11/17 03:31pm Link  |  Quote  |  Print  |  Notify Moderator

You should get instant fan. Then the furnace does all its prechecks. Instant fan gives time for the fan to purge the firebox of any gas should you have a leaky valve etc. Also the sail switch has time to close the connection to allow the gas valve to open.


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harry and thea

ontario, canada

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Posted: 10/11/17 03:47pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks. So problem is not thermostat.

2oldman

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Posted: 10/11/17 05:12pm Link  |  Quote  |  Print  |  Notify Moderator

I get instant fan no matter where the temp setting is.

Pauljdav

Everett, Wa

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Posted: 10/11/17 05:38pm Link  |  Quote  |  Print  |  Notify Moderator

All the thermostat does is provide instant power to the furnace main board. The main board desides what to do next.

I have had to replace the main board with a fans 50 plus on every furnace I have had. I recommend it as it is much better quality than the original.

darsben1

near Canada in NYS/ Casa Grande, AZ

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Posted: 10/11/17 07:05pm Link  |  Quote  |  Print  |  Notify Moderator

My first check would be the sail switch

2oldman

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Posted: 10/12/17 09:48am Link  |  Quote  |  Print  |  Notify Moderator

Pauljdav wrote:

I have had to replace the main board with a fans 50 plus on every furnace I have had.
Don't understand.

Joe Way

Quincy CA

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Posted: 10/12/17 06:24pm Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

Pauljdav wrote:

I have had to replace the main board with a fans 50 plus on every furnace I have had.
Don't understand.


THIS

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