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Laurence Foster 06-02-2010 01:55 PM

4 ton 13 seer goodman A/C & gas furnace unit
When cooling, my A/C will shut down at 9:00 PM every evening. I can't over ride it to make it work.

Also it will start running at times I don't have programed for. for instance I have leave set for 6:15 AM @85 and it will come on at 2:00 PM set for leave @ 78.

beenthere 06-02-2010 02:44 PM

Is it a new thermostat?

Its not your A/C. Its your thermostat.

Laurence Foster 06-04-2010 08:35 AM

This is the 3rd thermostat I've had hooked up, and they all act the same.

The A/C tectnician was out last evening and took the batteries out thermostat and the A/C didn't shut down at 900 PM like it has been.
It worked as it was programed.

I haven't observed what it will do at the other settings, but having it work last night was encourging.

What would taking the batteries out of the thermostat have to do with the A/C system

beenthere 06-04-2010 11:28 AM

Perhaps the batteries were in backwards.

Laurence Foster 06-04-2010 12:10 PM

No, I don't think they were in backwards, I think he would of said something if they were.

He was talking about low voltage and he wanted to take the batteries out to try something, but I didn't really understand what he was talking about.

yuri 06-04-2010 06:39 PM

What brand and model is the tstat. There are some that are "power stealing" meaning they siphon power off the hot to the tstat to try prolong the life of the batteries. They can cause weird problems with circuit boards and similar problems to yours. White Rodgers True Blue have a switch to defeat the power stealing function if problems occur. I recommend the Honeywell Focus or Vision Pro from HDepot. Or the White Rodgers and not use power stealing.

Laurence Foster 06-09-2010 09:40 AM

It's a Honeywell Pro TH4000. Is there a name for the switch?

yuri 06-09-2010 04:48 PM

Very strange problem. I have installed quite a few of those and they work well. DO NOT use rechargeable batteries (NiCad) with it. Make sure you have proper #18 wire (no telephone or smaller wire) from the tstat to the furnace. Has no power stealing switch so that should not be a problem.

Laurence Foster 06-10-2010 08:11 AM

I'm using duracell batteries. Thanks for your help. If you can think of
anything else, let me know.

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