Honeywell TStat, compressor working, fan/blower is not

[bjf5051]

I have a Goodman AC30-00 central AC system (no heat) on which I just replaced the old thermostat with a new Honeywell thermostat. The old Luxpro thermostat had three wires which where connected to G, Y, and RC/RH (jumpered). The old thermostat had two batteries powering it as well. The new Honeywell/Lutron TouchPro has wifi in it to connect to a home automation system there for it needs it power from the wall. I swapped the G, Y, and RC/RH wires over to the new thermostat expecting it to work but it would not power up (power was not being provided under this configuration). I then moved to the C and jumpered the G and Y. This allows the unit outside to turn on but the blower/circulation fan does not turn on. Any suggestions?

 

[mrjminer]

I don't know much about electronics, but my guess is to get a multi-meter and measure the amps that are going from each wire for each thermostat and see which is not working / not supplying enough power to start the blower or constant power, whatever is required. It is also possible miswiring it could have fried the blower (guess you'll know if hooking the old thermostat back up for testing and it still doesn't come on)

 

[BUTCH1]

Post it in home and garden.

 

[shabby]

There's no batteries in this new tstat(only a coin cell battery for time backup) so odd's are you need to have the C wire 24v hooked up to it. So if the ac has a C hookup on it run it from there or you'll need an external 24v hooked up to the thermostat. Or get a thermostat with batteries in it.

 

[BUTCH1]

There's no batteries in this new tstat(only a coin cell battery for time backup) so odd's are you need to have the C wire 24v hooked up to it. So if the ac has a C hookup on it run it from there or you'll need an external 24v hooked up to the thermostat. Or get a thermostat with batteries in it.

the 24V is for energizing the coil on the condenser relay, if this stat uses Wi-fi as well it may be designed to run with a wall-wart as running Wi-fi constantly would have you changing batteries constantly.

 

[boomerang]

I have a Goodman AC30-00 central AC system (no heat) on which I just replaced the old thermostat with a new Honeywell thermostat. The old Luxpro thermostat had three wires which where connected to G, Y, and RC/RH (jumpered). The old thermostat had two batteries powering it as well. The new Honeywell/Lutron TouchPro has wifi in it to connect to a home automation system there for it needs it power from the wall. I swapped the G, Y, and RC/RH wires over to the new thermostat expecting it to work but it would not power up (power was not being provided under this configuration). I then moved to the C and jumpered the G and Y. This allows the unit outside to turn on but the blower/circulation fan does not turn on. Any suggestions?

What model thermostat so I can look at the documentation for it?

And when you say no heat, you mean not even electric resistance heating? It's strictly an air handler?

I installed a Honeywell wifi recently and there are menu options for the type of system you have. You have to read the manual to find out the key combo to press to enter that specific menu. There are a bunch of options to toggle through that can be set and one has to do with the type of system you have. GFA, Heat Pump, two stage, etc. I don't recall the exact options and I am not at that residence now.

I seem to recall that the system must provide power on the C wire for the thermostat to function. Yours sounds like it does not have a C wire. It can be added though.

Need model number of thermostat. Edit: Looks like there is only one model in that line, looking now.

Edit: Looks like a bunch of us were typing at the same time.

 

[shabby]

the 24V is for energizing the coil on the condenser relay, if this stat uses Wi-fi as well it may be designed to run with a wall-wart as running Wi-fi constantly would have you changing batteries constantly.

The ac doesn't have a 24v output to the thermostat?

 

[boomerang]

The ac doesn't have a 24v output to the thermostat?

My understanding is that it is not a requirement for some of the simpler thermostats. But having said that, I should really back out of the thread because it appears that there are people with practical knowledge involved at this point. I change a thermostat without professional help from time to time and that's about the extent of my knowledge.

 

[mikeford]

Old school thermostat is basically a couple of mechanically activated switches. Your new one needs power, read the directions.

 

[SparkyJJO]

The C wire is common power, so yeah your new tstat needs that. Hopefully you have a spare wire (preferably blue/cyan) in your existing wiring that you can hook up on both the new thermostat and in your AC air handler. If you don't, you'll need to pull new thermostat wire.

Keep the appropriate G, Y, etc wires were they should be. Just running things to other terminals and jumpering willy nilly just makes things not work right as you've seen.

 

[richardycc]

you need to run a 24v common from your air handler to your new thermostat and rewire the 3 wires like they were from the old to the new, RC to RC(24 V Power to be switched), G to G (usually Fan), Y to Y (usually cooling call). make sure you turn off the power to your air handler before and while you are playing with the wires, you could burn out the transformer.

 

[MadScientist]

Post your question here: http://www.thermostatforums.com/forumdisplay.php?7-Honeywell-Thermostat

 

[herm0016]

you need to run a 24v common from your air handler to your new thermostat and rewire the 3 wires like they were from the old to the new, RC to RC(24 V Power to be switched), G to G (usually Fan), Y to Y (usually cooling call). make sure you turn off the power to your air handler before and while you are playing with the wires, you could burn out the transformer.

i have a honeywell wifi model as well, i had to run a new tstat wire with the extra conductor. the manual spells it out pretty well.