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The latest household programming bug

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Standard issue Honeywell thermostat. Just switched from off to cool and programmed a temp of 77 with a permanent hold (no other programming times, days, temps, etc). Woke you Friday freezing and saw that the permanent hold had changed to 66. Re-set to 77 and again set permanent hold, had the wife verify the display. This morning the set temp was 68. WTF?

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Does it take batteries?  Maybe an acid leak.

Yep, no leak and when removed from wall the display continues so the batteries are functioning. I'm thinking excuse to try the new fangled ones.

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#1 Check/Replace battery cells (probably two AA size)

         - If battery cells have leaked then throughly clean the battery compartment, surrounding and contacts

 

#2 Check for the condensation inside the thermostat itself.

         - mine had condesation getting formed, that damaged the tracks. Fortunately, I could fix it in our electronics hardware lab.

 

#3 The semiconductor component on the board may have been damaged. could be moisture, ESD damage.

         - This will require the replacement, unless you know how to diagnose/repair electronics parts.

 

#4 Honeywell might replace if it's under warranty

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It sounds like a malfunction for sure.  Get a new one, in whatever way is best.

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