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My furnace won't start. Furnace is in attic. I disconnected…

Customer Question
My furnace won't start ...

My furnace won't start

Contractor's Assistant: Did you check the furnace's filters?

Furnace is in attic

Contractor's Assistant: Do you plan on doing the work yourself?

Yes, I disconnected thermostat and read no voltage on any leads

Contractor's Assistant: Anything else we should know to help you best?

Should I read any voltage going into thermostat

Submitted: 9 months ago.Category: HVAC
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Customer reply replied 9 months ago
there are three wires red white black
Answered in 8 minutes by:
11/16/2017
HVAC Technician: airheatman, HVAC Technician replied 9 months ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,353
Experience: Furnace, A/C and heat pump specialist.
Verified

You will only read voltage between R and C if you have a C wire.

Touch R to W wires and see if furnace will come on

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Customer reply replied 9 months ago
no
HVAC Technician: airheatman, HVAC Technician replied 9 months ago

OK issue is not with thermostat.Are you able to go in attic and troubleshoot furnace?

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Customer reply replied 9 months ago
not tonight, i'll have to get up there in the morning
HVAC Technician: airheatman, HVAC Technician replied 9 months ago

I will not be here in the morning but another expert may reply

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Customer reply replied 9 months ago
ok
HVAC Technician: airheatman, HVAC Technician replied 9 months ago

I will check in when I get home to see if you still need help

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Customer reply replied 9 months ago
where do the 3 wire go on the thermostat?
Customer reply replied 9 months ago
o o o o
I____I jumpero o o
HVAC Technician: airheatman, HVAC Technician replied 9 months ago

what did you remove them from?

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Customer reply replied 9 months ago
someone had removed them doesn't know
HVAC Technician: airheatman, HVAC Technician replied 9 months ago

Ok we need to now what they connect to in attic. I suspect R W and G but need to make sure

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Customer reply replied 9 months ago
ok bye
HVAC Technician: airheatman, HVAC Technician replied 9 months ago

Bye for now

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