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airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8064
Experience:  Furnace, A/C and heat pump specialist.
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I have no power at my thermostat( checked with a multimeter)

Customer Question

I have no power at my thermostat( checked with a multimeter) I fliped the braker in my braker panel and the one on the HVAC in the attic any tips ;)
JA: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?
Customer: I wouldnt think its a large HVAC issue, the thermostat was working yesterday and today theres nothing
JA: Do you plan on doing the work yourself?
Customer: yes, as long as its nothing crazy
JA: Anything else we should know to help you best?
Customer: no thats about it
Submitted: 5 months ago.
Category: HVAC
Expert:  Rick replied 5 months ago.

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. First I’ll need some more info so I have a more complete picture of you situation.

What is the brand and model number of your furnace?

Customer: replied 5 months ago.
Brand is janitrol
Expert:  Rick replied 5 months ago.

I need a model number. It's on the rating tag which is inside the burner compartment.

Customer: replied 5 months ago.
Model is aruf182416aa
Expert:  airheatman replied 5 months ago.

Lets start by opening the top panel on air handler and checking to see if Janitrol used a small auto type fuse in the control circuit and if so if it is blown.If no fuse check for 240v in to transformer and 24v out.We will go from here.

Expert:  airheatman replied 5 months ago.

Look in red wire from transformer for an inline fuse

Customer: replied 5 months ago.
Ok, I'm taking the panel off now
Expert:  airheatman replied 5 months ago.

Standing by

Customer: replied 5 months ago.
It's open
Expert:  airheatman replied 5 months ago.

Follow red wire coming from transformer looking for the fuse

Customer: replied 5 months ago.
I don't see a normal fuse
Expert:  airheatman replied 5 months ago.

Probably a barrel fuse or small spade fuse

Customer: replied 5 months ago.
I see it
Customer: replied 5 months ago.
I just noticed it lol, climbed down to make sure power is off climbing back up
Expert:  airheatman replied 5 months ago.
Customer: replied 5 months ago.
Fuse is blown
Expert:  airheatman replied 5 months ago.

I figured it was. It is a 3 amp fuse.You will ne to replace with same.

Thanks for the opportunity to help you today.I have answered your original question and will apprectiate it if you will take the time to rate answer 3 stars or higher now so that I am compensated for providing you an accurate answer.You should see the stars for rating on your page.

Rating answer does not necessarily mean we are done if you still have questions. If you would like help in troubleshooting or have further questions we can continue here as long as it takes at no additional charge.

Customer: replied 5 months ago.
I'll go buy a new one and let you know thank you
Expert:  airheatman replied 5 months ago.

I recommend you buy several.There could be a short that caused that one to blow.Finding a short can be difficult. Easiest way to find is by process of elimination.If you can get several fuses, we can try different things until we no longer blow fuse to locate the short.

Most common causes.

1.Replacing thermostat with power on and allowing wires to touch

2.Chewed or shinned control wires

3. Shorted component