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Bill P.
Bill P., HVAC Mechanic
Category: HVAC
Satisfied Customers: 336
Experience:  Oil / Gas / A/C / Hydronics
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Just installed a new thermostat and now the heat wont turn

Resolved Question:

Just installed a new thermostat and now the heat won't turn on
Submitted: 4 years ago.
Category: HVAC
Expert:  Bill P. replied 4 years ago.

Bill P. :

hi there

Customer :

hello

Customer :

I am having issues with a honeywell thermostat i just bought and installed

Bill P. :

what type of furnace do you have? with a/c or heat pump?

Customer :

i dont know brand it is a gas heater

Bill P. :

how many wires was there to put on the new thermostat?

Bill P. :

Im wondering if you maybe blew a small fuse in the furnace

Bill P. :

is it a normal furnace

Customer :

there are 5 wires and im gonna go up and look at the furnace now

Bill P. :

ok, when you do, find the main power switch to the furnace, shut it off

Bill P. :

then fine where the thermostat wire goes into the furnace, it will connect to a computer board of some sort, on that board there will probably be a blade type fuse, 5 or 3 amp

Bill P. :

looks like a automotive type

Bill P. :

http://static.letsbuyit.com/filer/images/uk/products/238x178/152/10/sealey-automotive-fuse-3amp-pack-of-10-15210536.jpeg

Bill P. :

that is a link to a picture of the fuse

Customer :

comfortmaker is the type. it is in the attic

Customer :

found the computer board...now what?

Bill P. :

ok try and have a look for the fuse

Bill P. :

i put a link there above , that is likely what you are looking for

Customer :

is the fuse going to be behind the panel with all the wires?

Customer :

found it..now what?

Customer :

there's a number "5" on the fuse and and it's plugged in to a terminal labeled F1 if that means anything

Bill P. :

yep that would be the one

Bill P. :

remove it (power is off right?) and have a look

Bill P. :

if it is blown, the little metal strip that connect the 2 sides will be broken

Customer :

yes, power is off, and the two little pieces of metal in the middle that are shaped like a "z" are not connected. is that what we are looking for?

Bill P. :

yes thats right

Bill P. :

the z should be solid from one end to the other

Customer :

oh, good to know. so, does that mean we just have to repace this and we should be good to go?

Customer :

and where would we find this piece? home depot?

Customer :

or radio shack?

Bill P. :

more than likely yes, the fuse is there to protect the rest of the circuitry so it will likely be fine with a new fuse

Bill P. :

either one, but i would try radio shack first

Bill P. :

automotive supply store also would be a good place to try

Customer :

once we get the new part, should we reinstall the new thermostat?

Customer :

or just put the power back on?

Bill P. :

sure if that was your plan in the beginning

Bill P. :

but if you ever have to mess with the thermostat wires again, or any wires for that matter, just turn off the furnace power first, that way the fuse will not blow

Bill P. :

i would leave the old stat on for now, put the new fuse in and make sure everything works. then shut power off and put the new stat on, power on and you should be good (the new stat may need to be programmed to your preference)

Customer :

great! thanks for your help. So, basically we just blew a fuse and thats why it won't work?

Customer :

Appreciate the help

Bill P. :

That is the low voltage circuitry fuse, so since the power was still on when you were changing the stat, the wires touched each other and caused a short, so the fuse just pops

Bill P. :

Youre welcome, if for some reason that doesnt get you going you can come and carry on the conversation later

Customer :

well, thanks again!

Bill P. :

good luck!

Customer :

so, quick question...first time using this....do I wait to see if this works and then "accept" or do it now and if it doesn't can i still come back in the chat?

Bill P. :

I believe you can come back even if you accept now, but you can wait if you like, up to you..

Customer :

replaced the fuse, and it still won't work

Bill P. :

sorry i didnt get this till now

Bill P. :

are you using the old thermostat?

Customer :

no prob

Customer :

we tried but can't get the wires to connect where they are suposed to.

Bill P. :

hmm ok

Customer :

we had already put in the new one before we knew it didn't work

Bill P. :

does anything work, like the fan on button?

Customer :

nope

Customer :

tried that. we switch heat on, nothing

Customer :

put fan on, nothing. even tried a/c...nothing

Bill P. :

there is 5 wires right?

Bill P. :

before we get too far, maybe check the fuse again

Customer :

roger

Customer :

upstairs connected to the furnace, its a


red to r


white to w


yellow and another red going to y


green going to g


another white and copper going to c

Customer :

yet by the panel we have 5 wires

Customer :

and the fuse is still good

Bill P. :

2 of those wires will be going to the outside a/c unit

Bill P. :

what do we have for wires at the stat?

Bill P. :

do you have the door back on the furnace while you were trying it? (there is a door cutoff switch on the furnace)

Customer :

a "c" wire that the instructions on the new thermostat say not to use; blue, yellow, green, red, and copper. pld thermostat had copper plugged into c and blue was tucked into wall

Customer :

no we didn't. we will try that now

Bill P. :

k

Customer :

should we plug in the blue wire even though it wasn't plugged in before?

Bill P. :

no leave the blue unhooked

Customer :

ok..will do

Bill P. :

and leave the copper unhooked from c for now too

Customer :

we don't have a "c" on the new thermostat

Bill P. :

that makes that easy then lol

Bill P. :

do you have a white wire for W by the therm? i imagine you do, you just didnt list it

Customer :

yes

Bill P. :

ok, so with the door on the furnace what is happening

Bill P. :

and the power on

Customer :

putting the door back on now

Customer :

then going to flip the power

Bill P. :

k

Customer :

woohooo! it's on!

Bill P. :

nice one

Customer :

are we ever going to have to plug in the blue?

Customer :

or are we good for heat and a/c?

Bill P. :

no you wont need the blue, its not hooked up at the other end

Bill P. :

yep with the 4 wires you should be good

Bill P. :

the c wire is for 24 volt power for the thermostat (instead of running on batteries) but i guess your stat just doesnt bother with it

Customer :

ahhhh....that makes sense

Customer :

thanks a bunch!

Bill P. :

Youre welcome!

Customer :

have a good night!

Bill P., HVAC Mechanic
Category: HVAC
Satisfied Customers: 336
Experience: Oil / Gas / A/C / Hydronics
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Bill P.
Bill P.
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Oil / Gas / A/C / Hydronics