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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22515
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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I just replaced a CNT03715 board with a CNT05001. After

Customer Question

I just replaced a CNT03715 board with a CNT05001. After reading a few things, I realise that the T1 connector is not needed anymore. Unfortunately, I still do not see the led light coming on.
Submitted: 1 year ago.
Category: HVAC
Expert:  BillyHvac replied 1 year ago.
Do you have 24v signal between R and C?
First we have to determine if the low voltage is present. And if the board was replaced with 24v present we may have blown a small fuse on a circuit board in the furnace inside...that is where the 24v starts from..
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Customer: replied 1 year ago.
There is low voltage present. I checked the 24v fuse on the board in the furnace and it looks to alright.
Expert:  BillyHvac replied 1 year ago.
Is there 24v R to C at thermostat wire terminals?
Customer: replied 1 year ago.
Expert:  BillyHvac replied 1 year ago.
Thank you....and then outside at there 24v on Y?
and low pressure or high pressure are closed?

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