Honeywell T6 Thermostats

[opey456]

Installed a couple of Honeywell TH6320U2008 thermostats on Rheem heat pumps, both failed within a couple of days, voltage from thermostat to reversing valve varies from 5-23 volts which wont keep valve energized. All other control voltage is dead on 26 volts. All new control wire to both. Have since replaced with some Emerson thermostats and have had no further issues. Just curious if others have seen this issue with any of the T series line.

[STEVEusaPA]

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

[opey456]

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.

[joemach]

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.

[2sac]

I sell a shitload of them and rarely have warranty claims

[opey456]

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.

[GenesisRefrig]

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.

[R600a]

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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[Rovert]

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.

[R600a]

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

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.

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[opey456]

Both of these were duel fuel applications

[DOGBOY]

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.

[Core_d]

Had my share of bad ones...


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[opey456]

I will probably stay away from them for awhile then.

[BBeerme]

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.

[R600a]

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

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[Mionix86]

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.

[a1cycler]

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

[camp175]

we have also had to replace a fair amount of t6

[R600a]

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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