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I have A trane xb80 the ac stopped working.. Digital thermostat

Customer Question
is set right. Was working...
I have A trane xb80 the ac stopped working.. Digital thermostat is set right. Was working yesterday.. Took off furnace cover red light just keeps blinking.
JA: Thanks. Can you give me any more details about your issue?
Customer: The furnace blower will not cycle on when thermostat calls for ac
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Submitted: 1 year ago.Category: HVAC
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Answered in 5 minutes by:
4/5/2016
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22,765
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
Verified
hello, is the light in furnace blinking a slow pattern or a certain count..like 3...3...3..or is it just steady?
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Customer reply replied 1 year ago
Just steady
Customer reply replied 1 year ago
Are you still there
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago
ok remove top section of thermostat...take R wire and G wire and touch together...does blower kick on?
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Customer reply replied 1 year ago
Will try
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago
standing by
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Customer reply replied 1 year ago
No blower did not start
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago
ok you have something like a water drain switch, full pump switc, wet switch etc stopping power to the thermostat...can you tell me where the unit (ac) drains to inside?
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Customer reply replied 1 year ago
Yes I can see the pvc drains should I disconnect
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago
we are looking for 2 wires that would go to the drain or pump...is furnace in basement or attic?
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Customer reply replied 1 year ago
Attic.. Long line set... I just see where the pvc drains from coil... I don't see any wires
Customer reply replied 1 year ago
But even if I try to turn on heat that will not work either
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago
ok if in attic you have a safety pan switch or drain switch as it is required by code...this protects against water damage by turning ac off if plugged. You will need to use a shop vacuum and suck all the pipes out or safety pan...once the drain is clear the unit will come back on. Billy
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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago
heat will not work either because the water switch has cut power to the thermostat
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Customer reply replied 1 year ago
I see the pan the furnace sits in no water at all in pan
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago
you may not even see water....but drain is backed up...here is summary The steady blink tells us the system is ok and "waiting"By putting red (hot) to green should force the blower on...since it does not we know we dont have power at thermostat. That means somewhere from the R terminal in furnace...to the R terminal in thermostat..there is an open switch or connection..
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Customer reply replied 1 year ago
Where else might I find this water sensor.. And could the sensor be bad.. Meaning there is no water but it thinks there is
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago
if you open the furnace...you will see thermostat wires on same terminals as thermostat. Tis is where they start to then run to thermostat. The R terminal is what we are concerned with....follow the wire that attaches to R in the furnace...see if that wire goes to ANYTHING other than straight to thermostat...odds are you follow it to a switch that is open...unless you have a bad wire..
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Customer reply replied 1 year ago
I traced it all the way thru the wall. The res from the thermostat screws to a terminal on the inside of the furnace.. T
But no other wire from there. To a switch.
HVAC Technician: Gaztech, HVAC Technician replied 1 year ago
Gaztech
Gaztech, HVAC Technician
Category: HVAC
Satisfied Customers: 511
Experience: Owner at Gaztech
Verified
I noticed Billy has not responded back to you,I will assist you with the issue.at the furnace terminal can you put a jumper between R and G to see if blower starts.And if possible take a voltage reading between terminal R and C you should read <=24 V ac.
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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago
When you say red attaches to a terminal inside the furnace....is it the R terminal on the circuit board? Billy
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BillyHvac
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22,765
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