Is the thermostat likely bad in this case?
#1
07-05-17, 04:12 PM
Is the thermostat likely bad in this case?
I have a DICO White-Rogers thermostat
Type No. 1F89-73
The display is dead. There is 24vac (26.9 actually) to the thermostat between terminals G & R.
I called Emerson tech support because I couldn't find a diagram online and they gave me the number of 1F82-51 being the same. I can pull that up online
I can switch the fan to manual run and it comes on.
I can move switch to aux heat position and red light on board comes on. Nothing else seems to work?
Would you say it is likely a bad thermostat at this point? Remember display is blank so I can see anything on it.
If so what kind of thermostat do I need to get. I don't want anything fancy.
Sticker on outdoor part of unit says Model GT3BC-024K so it is a NOrdyne Split unit heat pump.
thanks for your help
Type No. 1F89-73
The display is dead. There is 24vac (26.9 actually) to the thermostat between terminals G & R.
I called Emerson tech support because I couldn't find a diagram online and they gave me the number of 1F82-51 being the same. I can pull that up online
I can switch the fan to manual run and it comes on.
I can move switch to aux heat position and red light on board comes on. Nothing else seems to work?
Would you say it is likely a bad thermostat at this point? Remember display is blank so I can see anything on it.
If so what kind of thermostat do I need to get. I don't want anything fancy.
Sticker on outdoor part of unit says Model GT3BC-024K so it is a NOrdyne Split unit heat pump.
thanks for your help
#3
07-05-17, 05:23 PM
Group Moderator
You need to check from R to C for 24vac. These two terminals are what supply the electronics of the thermostat.
The fact that you read 24vac between G and R tells you that the transformer is good.
The fact that you read 24vac between G and R tells you that the transformer is good.
#5
07-05-17, 08:19 PM
Group Moderator
You've confirmed power is present. Looks like the stat has died.
The one last you can try is to remove power and restore in a few minutes.
No display.... replace the stat.
The one last you can try is to remove power and restore in a few minutes.
No display.... replace the stat.
#7
07-08-17, 08:39 AM
Ok, tried disconnecting and powering back up. Still dead. Swapped it with one from upstairs that is exactly the same. That one works fine. So stat is bad. Now I will get another.
Question about replacement. I know there are a lot of different ones out there. I don't care if it is programmable or not. What do I need to look at when picking one. Of course one for heat pump. What about stages or things like that?
Question about replacement. I know there are a lot of different ones out there. I don't care if it is programmable or not. What do I need to look at when picking one. Of course one for heat pump. What about stages or things like that?
