Did you have the common hooked up? Seems odd that both failed. Did you buy them both at the same time/same place?

 

Always have a common. Both were purchased at same time. We buy them 4-6 at a time usually, but usually are using them in straight ac with gas furnace application.

 

I have not seen this problem in the dozen or so I have installed. Almost all heat pumps.

I still prefer the Honeywell 8000 series.

 

I sell a shitload of them and rarely have warranty claims

 

1st ones I have had any issues with. Just kinda odd to have 2 in the same house fail the same way. Just thought someone else may have seen a issue similar. I am no a big fan of the stab-lock wire connections, but I know most thermostats are moving that direction.

 

I put in tons of these and have not had a problem until last month. New furnace with heat pump. New wiring and T-6 thermostat with 3 heat, 2 cool. Furnace board kept blowing the 3amp fuse. It turned out to be a direct short in the thermostat. Put a different Honeywell statin, and problem solved.

 

We sell a ton of the t series and have not had any problems. Our only warranty replacement was a misdiagnosis and the stat was fine.

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There is a bad batch of T6's. We had five in a row that wouldn't run heat pumps. All our problems were on dual fuel systems but bench testing showed that that wasn't the only issue. Honeywell replaced (upgraded) them through our distributor.

 

I am glad to hear they took good care of you that is the important thing.

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Both of these were duel fuel applications

 

th6210u2001

we had one this week. Installed for 8 days on goodman heat pump. would not bring on the contactor, auxiliary or emergency heat. Fan would run no problem. The voltage would fluctuate between 5v and 20v this did have a common connected.

 

Had my share of bad ones...


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I will probably stay away from them for awhile then.

 

I've installed more than I can remember in commercial applications. Had one fail a day or two later, fan wouldn't come on. Think I had another fail, but can't remember what or why. It's still my normal economical truck stock stat.

 

Same here you get a bad one every once in a while of almost anything.

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I had 2 fail on me within 6 months of installation: First one thermostat button were unresponsive to anything and after removing thermostat and battery for one week, put back the battery and seem to work but did replace since i dont trust it. Second one after big wind and lot of power surge thermostat lost ALL config and went back to default config.

 

Thanks for the info . We use them on all of our heat pump installs. Will keep a look out for problems, but, none so far

 

we have also had to replace a fair amount of t6

 

You know now that I think about it I think we've had problems on heat pump installs too but if I remember correctly the problem turned out that we were running all of the power through one safety and it just added up to too much amp draw all we had to do is switch the safeties to just shut off the condensing unit instead of the red wire to the thermostat and we never had the problem again. It may not be related to what you all have had but it does seem somewhat similar. Anymore if it's a T6 or T10 I wire the safety between the condensing unit and the thermostat because I don't want that little bit extra voltage drop before the thermostat. Seems to have taken care of the only problems I've had with the t series.

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never had problems with T6

 

I am on jobsite now. Two furnaces not functioning. 27 volts R to C. 12 volts W to C. Jumper thermostat and both furnaces fire up.

 

I installed four yesterday. I get a call today: three have failed.

I go to the supply house down on Spring Garden st, and they have three available.

None of them connected R to W1 when the display says "HEAT ON." I tested them right there at the counter.

 

I installed four yesterday. I get a call today: three have failed.

Did they work when you installed them?

Ours didn't work from the start. They worked fine in AC but they wouldn't run heat or RV (energized in heat). We did get a constant 12-18 v on W1 and B regardless of whether there was a call for heat.

Per our wholesaler, Honeywell has a serial number range of faulty units. I would suggest having your supplier look into it and Honeywell's remedy.

 

I dont think that is a valid test unless you hooked it up to 24 volts but i could be wrong.
Assuming that you are referring to the t4.

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Oh, its a valid test alright. The fourth stat that was heating the space passed it on the counter at the client's store.

 

Ok i must have been thinking wrong.

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Truth be told, I have used this test for all stats that have batteries in them.

Typically, an installer has not run a C wire, and the entire working life of the stat depends on the batteries powering up all functions.

Yesterday, I had to put the old stats back up as a temp measure, and the office will determine which stat goes up as the permanent replacement.

I miss my Focus Pro 6000. Never had a bad one out of the box like these.