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Carrier HVAC LED light is off. No power to thermostat

Customer Question
Carrier HVAC LED light is off. No power to thermostat
Submitted: 3 years ago.Category: HVAC
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Answered in 19 minutes by:
6/26/2015
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 3 years ago
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 23,151
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
Verified
hello,
do you have a volt meter so we know for sure where we have power and where we do not?
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Customer reply replied 3 years ago
I don't have a volt meter
Customer reply replied 3 years ago
Do I need to go out and buy one? 30 minutes..
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 3 years ago
no prob...just get cheap one that reads ac volts with 2 leads
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Customer reply replied 3 years ago
Hi: I bought a Klein Tools Non Contact tester. Tested against working Carrier and It lights up Bright RED, Test on non working Carrier and it beeps twice red. I assume it detect 12 to 48 volts to AC. I test red wires and Black and White wires. Both get a faint beep of and red light flashes twice
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 3 years ago
can you back track to the switch on side of furnace and test? The goal now is to work backwards until find full power
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Customer reply replied 3 years ago
Ok. So From black power switch I followed all color wires and no signal. I followed black and white wires to silver small silver box connected to main power. There was a faint ping on the volage tester but hard to get. I put the tester on the outside of the small silver box where the main power cable comes in. The voltage is faint. I followed the line and the power picks up as I get farther away from the HVAC and closer to the house.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 3 years ago
have you tested the furnace?
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Customer reply replied 3 years ago
I was testing the furnace in the attict. Did i say that wrong? Should I be outside at the AC?
Customer reply replied 3 years ago
The thermast has no powerSo I assumed Furnace controlled the power
Customer reply replied 3 years ago
Thermast is 24 volt
Customer reply replied 3 years ago
HVAC LED CODE light is off solid
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 3 years ago
Ok,
the small silver box..is it a light switch with a round screw in fuse?
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Customer reply replied 3 years ago
No switch. I'll send a photo
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 3 years ago
can you start at the breaker for the furnace and work towards furnace?
May have to remove covers from junction box if necessary
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Customer reply replied 3 years ago
Section A with yellow arrow has a faint power signal. Behind that in Section B there is no Power
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 3 years ago
ok, remove that metal cover and test wire (black) direct
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Customer reply replied 3 years ago
I removed the metal cover around secition A. No signal in the black line or white line
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 3 years ago
thank you
now follow that pipe...go to next point you can check..as you already know you are missing power and we need to find it.
If you know which breaker it is....test there to eliminate a bad breaker
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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 3 years ago
ok
just say when you are not comfortable....
but the wires in the junction box in furnace.....we want to unhook the wires that come TO the furnace.
Then use an old extension cord...cut plug end off and wire white to furnace white and black to furnace black...and then plug into a known working outlet...are you up for this?
Of course just in case we want to cut power to the wires we unhook for IF they become live again.
Can you do this cord bypass?
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Customer reply replied 3 years ago
Ok, It will take a moment
Customer reply replied 3 years ago
What do I do with the light blue cord in the extension cord? I'm cutting the power and wiring after answer
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 3 years ago
lt blue not needed..only black and white
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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 3 years ago
how are we doing?
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Customer reply replied 3 years ago
I'm getting some power pings on unit but still no RED LED
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 3 years ago
is blower door pop out switch taped down?
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Customer reply replied 3 years ago
I'm holding it with my thumb
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 3 years ago
Ok,
tape it down.....locate wire that runs from that switch and it goes to circuit board....is there a reading there?.....you may have a power issue that took out the circuit board...
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Customer reply replied 3 years ago
Yes there is a faint reading
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 3 years ago
Thank you.....so even with extension cord plugged into a known working outlet...the board has no light..fuse on board is ok..?
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Customer reply replied 3 years ago
Fuse is ok. It was a 5 amp but I changed it to 3 thinking that would help
Customer reply replied 3 years ago
I've change the fuse before and that worked but not this time
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 3 years ago
it sounds like circuit board is bad...or transformer.
I know this is a pain...but cut power and unhook board and look at back...and smell for a electrical burned smell on board
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Customer reply replied 3 years ago
I may call it a day on this one. Lots of cables protruding from the board. What is cost of new board you think?
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 3 years ago
Around $150......sorry but it sounds like you have a issue AND damage as a result.
I really wish you well
Billy
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Customer reply replied 3 years ago
Excellent help. Take care
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 3 years ago
Have a good weekend..if all set just rate service and I will move from active list
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