HVAC Questions? Ask an HVAC Expert for Answers ASAP
Hi Nate, Trane xl90 two-stage. I attempted to install a new thermostat yesterday. a filtrete model which I had successfully installed another property. I'm a girl and and a know nothing about HVAC who maybe should not be touching this stuff, but I'm also stubborn and it's the weekend, so I fear weekend rates for HVAC. I don't know what I did or did not do correctly but I've already blown a fuse twice (and replaced with what appears to be the same color/ number voltage etc from radio shack) I got the thermostat working but doesn't seem to respond correctly. I had to make some guesses on the wiring as of course none of the examples given (filtrete install guide) matched mine exactly. I saw some error codes flashing and so decided to put in the old thermostat and call the filtrete support line Monday. I got the old thermostat back on, hooked up exactly as it was originally (had marked all the wires) and it seems to be working fine. But.. the furnace is still flashing a consistent red light along with a green light from time to time. Did I do some damage? or does it all need to be reset or something.
I should clarify, the error codes I saw when the new filtrete thermostat was hooked up, were on the furnace, not on the thermostat
Hi Russ, I did connect the blue B wire from the old thermostat to the C on the new thermostat. I was confused by the W1 wire on the old thermostat, there was only a W or W2 slot on the new one, and the Yellow wire from the old thermostat I put on Y, although there is also a Y2 on the new thermostat. About the error codes on my trane now, any idea on that?
old thermostat was G, B, R, W & Y
new thermostat has these available :: C,B,O,W,W2,Y, Y2,RH,RC,G,A
jumper R to RC connect?
I see they are already pre- 'jumpered' on the thermostat and I believe they are also 'jumpered' on the control board, I'm going down to verify that now
yes and replaced the 5amp fuse - appears w and w2 was jumpered on the control board. the old thermostat is working, I was just asking about the error codes.. is the red light and green light supposed to be flashing on the control board.
On the new thermostat, it kept saying stage 2 and seemed it took a really long time to come on and then the fan blew hard and then not hard and it just seemed as if something was not right, this why I put the old one in.
and it seems to working fine, I was just asking whether I was seeing error codes.
I tried.. but it seemed like it was acting funny, so I put the old one back in, it's the 3m-50
I put the old trane therm back in
but I see a green flashing light on the furnace control board and cannot find info on it..is it normal?
what is option 2? I'm asking because I do have a 2 stage furnace..and want to make sure I'm setting it all up correctly, also, I have to reinstall it now and I'll be back in touch'
in about 10-15 minutes
before I hook that thermostat up again, are you having me program it for 1 stage cool? can we speak on the phone again, maybe will go faster
is there 2 stage cool?
seems the other thermostat had it come on a little and then blow harder after a bit
ok, I put the new therm back together..and I'm going to basement to power it up and then come back up and program it.
Meantime, why would it be wired 1 stage cool, if I have two stages available? also, I cannot find out if the green light flashing on my furnace means there is a
problem, is there a problem ..or is the green light flashing nowmal, I cannot seem to find that on the door where all the codes are
ok, all set up! can you tell me about the green flashing light and I'm sure we're done
Russ, I wish I had known that you were having connection issues, as it felt on this end that you were too busy to read my initial question. which basically was 'I hooked up the filtrete thermostat' but then reinstalled the old one due to some flashing lights on the control board of the furnace. I was afraid I had done something wrong and appears I had not.. that is if the red light contantly flashing and the green light also flashing is normal. I'm still not sure what CFM means, but concluded it didn't mean there was an error. There are error codes and some kind of explanations printed on the inside of one of the doors, but they were not so clear on the green light, and I still wasn't sure on the red light either, I had needed someone to explain that. Meantime, I also wasn't sure if I had hooked up the wires correctly either with the variation on the W, W1, and W2, Y and Y2 options and wanted to make sure I was enabling my particular 2 stage scenario. But it's all hooked up and working it seems, so maybe it's all okay. Hey can you tell me why it is so incredibly cool in the basement where the furnace is and not so much upstairs where the people live? thanks, Elynne
it's wild down there in the basement .. it's a large old house, w. two separate units, one up and one down, two furnaces in the basement, both w/ air conditioning compressors outside
unit upstairs only has one return in 1500 sq feet, almost impossible to cool up there
Downstairs, 2 returns in 2400 square feet, cools pretty well but both a/c's run 24/7
the return pipes do all run to the basement and the furnaces,
ain't that the truth, as the cold air has to travel far then falls and the vents are all in the floor too. Make any sense to insulate the pipes? or replace the furnace fan for the 2nd level furnace to boost the flow? I re-insulated the attic but didn't make much difference at all.
maybe I'll put in a good ceiling fan upstairs - where the ceiling is lofted.
ok, well that confirms it.. it's just a tall house, and an old house (115 yrs old) ..needs a respirator, thanks for the chat russ.