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BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22471
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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Billy. my furnice will not start up changed batteris in wall

Customer Question

hi billy . my furnice will not start up changed batteris in wall thermastat still no go
Submitted: 1 year ago.
Category: HVAC
Expert:  BillyHvac replied 1 year ago.

hello, is there a blinking light on the circuit board in furnace?

Customer: replied 1 year ago.
no just tell me what you think
Expert:  BillyHvac replied 1 year ago.

if no blinking light then the furnace does not have power...breaker, fuse, door switch etc. Do you have a test meter?

Customer: replied 1 year ago.
going to check just one min
Expert:  BillyHvac replied 1 year ago.

standing by

Customer: replied 1 year ago.
sorry has red light not blinking can see light thourgh round window
Expert:  BillyHvac replied 1 year ago.

great so red light is on solid?

Customer: replied 1 year ago.
Expert:  BillyHvac replied 1 year ago.

Thank you. Your thermostat is bad.

To test:

remove top section of thermostat to where you see wiring..take wire from R and wire from W and twist together. If furnace starts..then you need to replace the thermostat

Billy

Customer: replied 1 year ago.
going to check standby
Expert:  BillyHvac replied 1 year ago.

standing by

Customer: replied 1 year ago.
ok back no go put ynr together and nothing
Customer: replied 1 year ago.
sorry r n w
Expert:  BillyHvac replied 1 year ago.

so R to W did nothing?

Then you must have a water safety switch or wire open....trace red wire from furnace circuit board R and tell me if it goes straight to thermostat

Customer: replied 1 year ago.
wire runs to stat was
Expert:  BillyHvac replied 1 year ago.

ok you alright with removing doors from furnace and taping the bottom dor safety switch down?

Customer: replied 1 year ago.
no problem
Expert:  BillyHvac replied 1 year ago.

then with power on...and red lit solid on circuit board....locate R and W again but this time on the circuit board where the thermostat wires attach.

Use a short wire or paperclip shaped in a U...hold one end on R while holding other end on W...tell me if furnace starts

Customer: replied 1 year ago.
jumped rnw furnice starts but blows colr air igniter did not lite
Expert:  BillyHvac replied 1 year ago.

great so R to W started fan ....did light stay solid?

Customer: replied 1 year ago.
did not notice but will recheck just one minit
Customer: replied 1 year ago.
no light blinks not solid
Expert:  BillyHvac replied 1 year ago.

ok now we are getting close....it will blink a 2 digit number...short blinks then long

short...long.long = 12 for example

Customer: replied 1 year ago.
we think its short long long
Expert:  BillyHvac replied 1 year ago.

great...now attach the little jumper right into the terminals r and w instead of holding it...then that 12 code should run 90 seconds...then tell me what next code is or if furnace starts

Customer: replied 1 year ago.
used jumper wire with clip on each end ran furnice for until it kicked itself off did you want me to count blinks
Customer: replied 1 year ago.
it ran for about 90
Expert:  BillyHvac replied 1 year ago.

so furnace did run 90 seconds..did not fire up..and shut down..and if shut down what was that code

Customer: replied 1 year ago.
1 short 2 long i believe
Expert:  BillyHvac replied 1 year ago.

I am sorry but must go offline for a while. I am giving you the manual with troubleshooting in the back. I will opt over to another tech while I am gone

Manual HERE

Customer: replied 1 year ago.
well what now
Customer: replied 1 year ago.
will be off line for a while not working so far will be back in 2 hours
Expert:  BillyHvac replied 1 year ago.

Are you ready to start again?