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Old 11-01-2010, 11:33 AM   #1
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Installed new thermostat, killing fuses when switching to heat


Hello all,

My upstairs and downstairs thermostats are both newer and apparently wired wrong. I went by the manual and I keep referring back to it but it looks like it's wired correctly according to that which is causing me a migraine, lots of confusion, and a cold miserable family. They are both Lux TX900TS thermostats. The A/C and fan work fine but when switching to heat it kills the fuses instantly. Can I get assistance on this please? Below are pictures of the way it's currently wired. Top picture is downstairs and bottom picture is downstairs.





Last edited by carsnrockmusic; 11-01-2010 at 11:42 AM.
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Old 11-01-2010, 01:10 PM   #2
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Installed new thermostat, killing fuses when switching to heat


the wiring at the t.stat may not match wires at the unit. Check t.stat wires at the unit. There's a short somewhere

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Old 11-01-2010, 03:59 PM   #3
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Installed new thermostat, killing fuses when switching to heat


There are two and it worked before I installed the new thermostats. It's in my home's inspection (I changed them shortly after moving in to programmable ones). Just wanted to add that as I'm fairly certain it's the wiring on this side.
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Old 11-01-2010, 04:47 PM   #4
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Installed new thermostat, killing fuses when switching to heat


My guess, is that the blue wire. is a common, and if it is. it belongs on C.

Go to your air handler/furnace, and see if the blue wire is connected to C. if so, just move it to C on the thermostats, and you should be good to go.
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Old 11-01-2010, 08:43 PM   #5
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Installed new thermostat, killing fuses when switching to heat


Thanks beenthere. I'm going to give this a try tomorrow. I spoke to someone from Lux and they said I may have the wrong thermostat? Does anyone know anything about this? Not sure how it could be the wrong one as I've got no experience with HVAC anything.

beenthere, on the downstairs one there's an extra wire that is black that doesn't exist in the upstairs wiring. I was going to move the blue one to common on that one and the upstairs. What should I do with the black? Cap it off?


Thanks for everything so far. Very much appreciate this. It's supposed to be in the 30's tomorrow...Have a lot of pressure on myself to get this solved.
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Old 11-01-2010, 09:14 PM   #6
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Installed new thermostat, killing fuses when switching to heat


you will need to look on the unit. wright down how it's wired & wire your t.stats the same . r to r, w to w, y to y, it b is on the c terminal at the unit. wire b to c at the t,stat. Do the same for both units
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Old 11-02-2010, 04:21 AM   #7
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Installed new thermostat, killing fuses when switching to heat


Was that black connected on the old thermostat? If not, yes just cap it.
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Old 11-02-2010, 03:43 PM   #8
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Installed new thermostat, killing fuses when switching to heat


Quote:
Originally Posted by beenthere View Post
My guess, is that the blue wire. is a common, and if it is. it belongs on C.

Go to your air handler/furnace, and see if the blue wire is connected to C. if so, just move it to C on the thermostats, and you should be good to go.
For blue, I always think "Cyan", so it's C.

Oh yeah, and for B, I think Orange = '0', unless it's an OddBall then it's 'B'.

Last edited by garya505; 11-02-2010 at 04:01 PM. Reason: Orange - O/B
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Old 11-03-2010, 08:11 AM   #9
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Installed new thermostat, killing fuses when switching to heat


I hooked the blue up to common and it worked however the unit outside doesn't appear to be coming on so I think it's running off of electric and not the heat pump. If I'm understanding this correctly this could result in a huge electric bill.


Last edited by carsnrockmusic; 11-03-2010 at 08:15 AM.
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