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Tried to replace Thermostat, now A/C nor Heat works (or fan)

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Tried to replace Thermostat, now A/C nor Heat works (or fan) mindflux98 06-25-2006
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Posted by on June 25, 2006, 1:51 pm
Well my roomate and I tried to replace our thermostat with a
programmable one. We turned off the breakers, labeled all the wires
and got to work. This T-stat is for heat/cooling with a heat pump and
emergency heat.

When we put the new t-stat in, we had 8 wires off the old T-stat. The
manual said to just use 5 (so did their 800 help line).

Here's what we took off.

R = Red
Y = Yellow
W = White
X2 = Black
T = Brown
O = Orange
G = Green
B = Blue

What we hooked up:

R = RC
Y = Yellow
W = W1
O = Orange
G = Green

We taped off Blue, Brown and Black (as per the 800 tech's
recommendation).

Reset all the breakers to ON....

Upon getting it all set up nothing worked, I couldn't even manually
turn the fan on.

So.. this is where we currently sit.

I put the Old Tstat back in PRECISELY how it came off. All the wires
went where they needed to be. Nothing! Not even switching the t-stat
to emergency heat the red light doesn't illuminate.

I tried to use a multi-meter at the T-stat to check the 24v AC off the
Red wire.. but I'm only reading like .03 volts.. (I'm not sure if I'm
not using the multimeter right or what?).

Anyway.. It's hot as heck in the house and nothing I've done has
helped.

Has anyone got suggestions?

-R


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Posted by Al Moran on June 25, 2006, 2:14 pm
On 25 Jun 2006 10:51:41 -0700, mindflux98@gmail.com wrote:

>Well my roomate and I tried to replace our thermostat with a
>programmable one. We turned off the breakers, labeled all the wires
>and got to work. This T-stat is for heat/cooling with a heat pump and
>emergency heat.
>
>When we put the new t-stat in, we had 8 wires off the old T-stat. The
>manual said to just use 5 (so did their 800 help line).
>
>Here's what we took off.
>
>R = Red
>Y = Yellow
>W = White
>X2 = Black
>T = Brown
>O = Orange
>G = Green
>B = Blue
>
>What we hooked up:
>
>R = RC
>Y = Yellow
>W = W1
>O = Orange
>G = Green
>
>We taped off Blue, Brown and Black (as per the 800 tech's
>recommendation).
>
>Reset all the breakers to ON....
>
>Upon getting it all set up nothing worked, I couldn't even manually
>turn the fan on.
>
>So.. this is where we currently sit.
>
>I put the Old Tstat back in PRECISELY how it came off. All the wires
>went where they needed to be. Nothing! Not even switching the t-stat
>to emergency heat the red light doesn't illuminate.
>
>I tried to use a multi-meter at the T-stat to check the 24v AC off the
>Red wire.. but I'm only reading like .03 volts.. (I'm not sure if I'm
>not using the multimeter right or what?).
>
>Anyway.. It's hot as heck in the house and nothing I've done has
>helped.
>
>Has anyone got suggestions?
>
>-R


Find the air handler, that's the part that puts the air in the house.
Look for a three or five amp flat fuse. If it's popped then replace
it, if you do not find any fuse then replace the transformer. When you
replace the transformer make sure you put a 3 or 5 amp fuse inline
with the red 24v side of it.

Posted by Ryan on June 25, 2006, 2:26 pm

> Find the air handler, that's the part that puts the air in the house.
> Look for a three or five amp flat fuse. If it's popped then replace
> it, if you do not find any fuse then replace the transformer. When you
> replace the transformer make sure you put a 3 or 5 amp fuse inline
> with the red 24v side of it.

Thanks, the only fuse I've found is this:

http://host1.publiquik.com/bussmann_web/images/inventory/tn_GMQ_photo.jpg

I cannot see if it's popped since it's got a laminant over the glass.
It's a BUSS fuse, not a flat fuse (like cars use).


Posted by Al Moran on June 25, 2006, 2:40 pm

>
>> Find the air handler, that's the part that puts the air in the house.
>> Look for a three or five amp flat fuse. If it's popped then replace
>> it, if you do not find any fuse then replace the transformer. When you
>> replace the transformer make sure you put a 3 or 5 amp fuse inline
>> with the red 24v side of it.
>
>Thanks, the only fuse I've found is this:
>
>http://host1.publiquik.com/bussmann_web/images/inventory/tn_GMQ_photo.jpg
>
>I cannot see if it's popped since it's got a laminant over the glass.
>It's a BUSS fuse, not a flat fuse (like cars use).


If you cannot find the buss fuse then just cut the old one out as a
fuse is a fuse is a fuse. I saw your post on the hvac forums. Your
fuse is dead if your reading ol on the meter. As I said, cut the fuse
out, go to the nearest auto parts store and get two spades and at
least 4 or five 5 amp fuses. Where you cut the buss fuse out put a
spade on either side then insert the 5 amp flat fuse. Make sure you
get some extras in case you have a short somewhere. Was the system
working before you changed the stat? If so then you did not turn off
the right stuff before you installed the stat and you shorted some
wires together while doing so. If the system was not working before
you changed the stat then something else is going on.

Posted by Ryan on June 25, 2006, 2:49 pm

> If you cannot find the buss fuse then just cut the old one out as a
> fuse is a fuse is a fuse. I saw your post on the hvac forums. Your
> fuse is dead if your reading ol on the meter. As I said, cut the fuse
> out, go to the nearest auto parts store and get two spades and at
> least 4 or five 5 amp fuses. Where you cut the buss fuse out put a
> spade on either side then insert the 5 amp flat fuse. Make sure you
> get some extras in case you have a short somewhere. Was the system
> working before you changed the stat? If so then you did not turn off
> the right stuff before you installed the stat and you shorted some
> wires together while doing so. If the system was not working before
> you changed the stat then something else is going on.

I can remove the buss fuse.. as I was carrying it around all day
hopping from store to store trying to find someone that had it.

The central unit has a spot where I just put the buss fuse in, turn the
knob to lock it in. How would I replace that with Spade Fuses?

The system WAS working before I replaced the T-Stat. I shut down all
the breakers, replaced it as per the instructions (taped off three
wires I was told not to use).. fired the system back up and have been
A/C less since Mid Saturday!

I see grainger carries the BUSS fuse.. but I may have to wait till
tuesday if they do not have in stock on monday.

Thanks for your advice.


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