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Plumberpro
Plumberpro, Home Appliance Technician
Category: Appliance
Satisfied Customers: 634
Experience:  Heating and hot water heating appliances experienced
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I have a honeywell ST6400C programmer that will not switch

Resolved Question:

I have a honeywell ST6400C programmer that will not switch the heating on auto but will operate the hot water on auto,the heating will work on constant,do i need a new programmer.
Submitted: 1 year ago.
Category: Appliance
Expert:  Plumberpro replied 1 year ago.
Hi , unfortunately , the short answer is yes . an internal component has failed.
If you replace with the same model you can use the same wiring back plate
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