How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Machinc Your Own Question
Machinc
Machinc, General Contractor
Category: HVAC
Satisfied Customers: 813
Experience:  Has written home improvement articles since 2008. Earned South Carolina Residential Builders License in 1991.
75209918
Type Your HVAC Question Here...
Machinc is online now
A new question is answered every 9 seconds

I replaced the contactor on my Heil AC unit today and now I

Customer Question

I replaced the contactor on my Heil AC unit today and now I am not getting 24 volts to my furnace or to my ac unit outside. I checked the thermostat and everything is good there.
Submitted: 1 year ago.
Category: HVAC
Customer: replied 1 year ago.
replaced the contactor on my Heil AC unit today and now I am not getting 24 volts to my furnace or to my ac unit outside. I checked the thermostat and everything is good there. Any ideas of why this is happening?
Expert:  Machinc replied 1 year ago.

I will have your answer in a moment

Expert:  Machinc replied 1 year ago.
The 24 volt transformer is often protected by an an in line
Fuse. It Is possible you blew the fuse while working on the unit.
Orher possibilities :
high voltage feed to transformer power supply was accidentally disconnected'.
Low voltage lead/leads from transformer accidentally disconnected
Check ac voltage at transformer
check 24volts is leaving transformer
I will be glad to answer any questions you may have
Machinc
Customer: replied 1 year ago.
It doesn't seem that I have any voltAge at the transformer
Customer: replied 1 year ago.
Do you know where the fuse might be located?
Expert:  Machinc replied 1 year ago.
On the ac feed to the transformer on the hot side.
Usually inline but may be a twist out mounted on the
unit and possibly even a reset button.
Would be close to the transformer.
Machinc
Expert:  Machinc replied 1 year ago.
NOTE:
Some units have a 15 or 20 amp
120v breaker inside the unit for
the transformer and fan.
It could be tripped and not properly
reset. Turn off an back on.
Others have an off switch near the
Fan insude the unit.
Machinc