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Have a Lenox HP13 outside, and CB26 Air Handler. Just changed out the Thermostat to a Honeywell RTH7500 programable. Atached the Red to R, Orange to O/B, Yellow to Y, Green to G, Blue to C, and White to Aux. Reset all breakers in main box in house now have no air handler fan and no condenser turn over? What did I screw up?

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  • Brian Niten Aug 28, 2010

    Some thermostats have a built in time delay. This could be up to 5 mins. Also the circuit board in your outdoor unit may have the same. It's been my experience that they do. If it hasn't already started running, you may want to turn it back on and give it a few minutes.

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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.
Shastalaker7
A/C, Heating Contractor

Posted on Aug 28, 2010

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The connections that you really need to reference would be at the air handler itself. That would tell you which wires go outside to the heat pump and which wires go to the air handler. I can however give you some basics that may help.

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Terminals/Colors/Function
R- Red- 24v power supply. (Usually a jumper between RC/RH)
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Brown will go to the air handler to the heat relay for the emergency heat.

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