Question about Heating & Cooling
Hi, sounds like this is a Lennox heat pump. On the stat wiring it looks as though you wired it correctly except on the reversing valve terminals o/b, the orange wire should be on the o terminal only as the reversing valve is energized through in the cooling mode and will default to heat if the compressor fails. Make sure you have no control wires at the new stat that may have touched and blew the 3 to 5 amp fuse in you air handler. You can go to the air handler and see if the circuit board has this auto type fuse and a control board I believe it will as it may have blown. Just sounds like this is a control voltage problem as this is all you have been working with is the change out of the stat. Keep in mind that this new stat also has a built in time delay that will keep the unit off for several minutes.Check this fuse though. If you have excess to a voltage tester, you could check for 24 volts at the stat by setting it on its lowest ac volt setting and check across R to G or Common and it needs to read 24 or more volts. If not, its either a control volt 3/5 amp fuse or a faulty transformer. You say you had the breakers off, so if you happened to stripped the wires at the sub-base and the R or hot has touched the C terminal it could have taken out the transformer or just a fuse. This is where you need to look first is the control board or control module. Please keep me posted so I can get you up and running. Make sure you have the stat programmed correct also. Please let me know.
A/C, Heating Contractor
Posted on Aug 28, 2010
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Posted on Jan 02, 2017
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