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airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8164
Experience:  Furnace, A/C and heat pump specialist.
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I'm installing a Honeywell TH3210D 4 wire thermostat on an

Customer Question

I'm installing a Honeywell TH3210D 4 wire thermostat on an all electric Goodman split system. Where does my jumper wire need to be? (E & AUX ?) Thanks.
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

The TH3210 is a heat pump thermostat. Sounds like you do not have a heat pump since you only have 4 wires. You will need the TH3110.

Expert:  airheatman replied 1 year ago.

Can you give me model on your outdoor unit?

Customer: replied 1 year ago.
Outside unit is a Miller, inside is a intertherm.
Expert:  airheatman replied 1 year ago.

There should be a model on outdoor unit like S5QDA36 or similar

Customer: replied 1 year ago.
Sorry, I can't find a number, the sticker isn't ledgable. It's from 2003.
Expert:  airheatman replied 1 year ago.

1. How any low voltage wires go to outdoor unit?

2.Does your outdoor unit normally run in heat mode or just cool?

Customer: replied 1 year ago.
Just 2 wires to outside unit. The outside unit normally only runs when cooling but since replacing the stat, it runs when the heat is on too.
Expert:  airheatman replied 1 year ago.

That is what I suspected. You are not going to be able to use the TH3210 as it is designed for a heat pump. When you call for heat, the compressor is energized.

You will need the TH3110 for your unit or any single stage heat/single stage cool non heat pump thermostat

Customer: replied 1 year ago.
OK, thanks for your help! I'll replace it tomorrow.
Expert:  airheatman replied 1 year ago.

No problem, If you get the TH31110 you will use R with jumper to RC, G, W and Y.Thanks for letting me work with you.If my answer has been polite, professional,and thorough, please click one of the ratings before you go. If you still need help let me know!.Expert is not paid for assisting you until you rate answer.Feel free to follow up for 30 days at no additional cost. Bonus always appreciated if you feel justified.I am here most everyday if you need assistance with the new thermostat,just let me know.

Customer: replied 1 year ago.
Will-do, thanks again.
Expert:  airheatman replied 1 year ago.

Thank you