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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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We have a gas furnace/airconditioning unit. We are using a

Customer Question

We have a gas furnace/airconditioning unit. We are using a Honeywell T8665A wireless thermostat- Chronotherm IV I understand this thermostat is obsolete and need to replace it. Would like to know if there is a compatable thermostat for it.
JA: Did you double-check the thermostat's settings? And what about the filters?
Customer: The thermostat is old and having difficulty changing settings from heat to cool to off. The filters are fine.
JA: Do you plan on doing the work yourself?
Customer: It is a wireless thermostat and it is held on with two screws so I would assume my husband could put it in if we had a compatible unit.
JA: Anything else we should know to help you best?
Customer: I called tech support and he wanted to know how many wires were on the back and their are five, but it is a wireless unit.
Submitted: 9 months ago.
Category: HVAC
Expert:  Phil replied 9 months ago.

Hello, I am working on your question, will be back in a few minutes.

Expert:  Phil replied 9 months ago.

That is the manual for it. It is not listed as obsolete anywhere. Who told you it was obsolete?

Have you replaced the batteries lately?

We can go from there

Customer: replied 9 months ago.
I called tech support and they said it was obsolete. Yes we have changed the batteries.