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Old 01-06-2008, 08:54 PM   #1
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Bryant Plus 90 start up problem


We just purchase a vacant house (foreclosure) that has a Bryant Model 350MAV Plus 90 furnace. The furnace started and ran flawlessly about a month ago during a home inspection. The furnace was turned off and hasn't run since the test. We just closed on the house and will be moving in soon. However, the furnace will not start.

Here's what we observed:

-LED light on the circuit board is on and glows solid.

-Thermostat appears to be sending signal to unit.

-Blower motor runs when thermostat set to fan only.

-Blower motor stops when thermostat mode is changed to heat setting.

-All components (draft inducer, igniter, blower) operate when jumping the com24v to the test terminal.

The only thing that's different since the successful test is the colder weather. What would prevent draft inducer motor from starting now?

We are are a very tight budget with the new purchase and hope that it's a small DIY repair. Your help is greatly apprecieated.

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Old 01-06-2008, 10:22 PM   #2
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Bryant Plus 90 start up problem


Quote:
Originally Posted by mgraw View Post
We just purchase a vacant house (foreclosure) that has a Bryant Model 350MAV Plus 90 furnace. The furnace started and ran flawlessly about a month ago during a home inspection. The furnace was turned off and hasn't run since the test. We just closed on the house and will be moving in soon. However, the furnace will not start.

Here's what we observed:

-LED light on the circuit board is on and glows solid.

-Thermostat appears to be sending signal to unit.

don't guess, know...check it with a volt meter

-Blower motor runs when thermostat set to fan only.

-Blower motor stops when thermostat mode is changed to heat setting.

-All components (draft inducer, igniter, blower) operate when jumping the com24v to the test terminal.

what happens if you jump R term. to W term ?

The only thing that's different since the successful test is the colder weather. What would prevent draft inducer motor from starting now?

We are are a very tight budget with the new purchase and hope that it's a small DIY repair. Your help is greatly apprecieated.
get a meter and check it out

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Old 01-07-2008, 06:54 PM   #3
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Bryant Plus 90 start up problem


Thanks bigMikeB -- What a relief, it was the thermostat. I played around with it and found that it will work if the room is at least 45 degrees. It's an OEM digital thermostat. Have you ever encountered one that doesn't work below a certain temperature?

Thanks again for pointing me in the right direction.
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