Problem: Replacing Honeywell T6960 With Honeywell TB6575 - HVAC - DIY Chatroom Home Improvement Forum

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Old 07-19-2012, 08:06 AM   #1
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Problem: Replacing Honeywell T6960 with Honeywell TB6575

Hello All,

I am trying to replace my old T6960 Fan Coil thermostat with a SuitePRO TB6575. Everything works as it should, except:

If I try to select any fan speed besides low, all the screen options light up for one second and then the entire system shuts off and resets. Any thoughts on what I have messed up? Also, it also seems like the thermostat's low setting is actually running the fan at high.

Any ideas? I can provide photos, include more info, etc.

Honeywell T6960 installation instructions:

Honeywell SuitePRO TB6575 installation instructions:


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Old 07-21-2012, 02:05 AM   #2
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Is this a 2 pipe or a 4 pipe application?
If this is a 2 pipe do you have boiler or chill water?

Which Fig. in the old manual shows your application?
Which Fig. did you use in your new application?

Do you have pictures of the initial wiring as well as the new stat wiring?
Post the pics that you have...


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