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Thread: WR 1F82-261 Thermostat "randomly" turns off heat pump

  1. #7
    HVAC Thermostat Specialist

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    Quote Originally Posted by VonMagnum View Post
    What if I connected the 2nd stage wire to ONLY the emergency contact? They are currently jumpered together. This way the fossil fuel kit would control the heat pump/furnace selection, but I could still select the furnace with the emergency switch?
    I think that would be your best wiring option.

  2. #8
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    The most bizarre thing of all is that if I just take the cover off the thermostat (not re-wiring it for now), it then appears to work as I would expect it to. In other words, it just ran a full heat pump cycle and never called for aux heat and this has been repeatable. I put the plastic cover back on and the next time it will call for aux. I take it off and it doesn't call for aux. There's no electrical connections on the cover, just a face plate and sliding cover with holes for the buttons to poke through. I've also noticed that the taking the cover off immediately shows a rise in temperature in the room of about one to one and a half degrees or so (i.e. the cover is interfering with the thermostat reading the room temperature somehow). I don't know if this interference is why it's selecting aux heat somehow or what, but it's not my imagination that taking the cover off make a huge difference. Unfortunately, I don't like have the thermostat sitting there exposed so unless I can take advantage of this somehow and figure out what exactly is making a difference and if there's something else I can do other than leave the cover off, I don't know.

    I'd be curious to hear what the rep from Emerson thinks of that behavior because I can't explain it. The only thing I can think of is that if the thermostat thinks the temperature isn't moving upward fast enough because the cover is fooling the reading and making it read low, then maybe that's why it's calling for more heat. But I find this unlikely since I've left the cover off for multiple cycles and even if it was 2 degrees off, it's consistently 2 degrees off. In other words, the rise in temperature only happens immediately after removing the cover the first time and it's not like I can see any wild fluctuations happening with or without the cover on. It just drops and then goes back up with the heat pump or furnace on. Could the cover be pressing on something on the circuit board, causing it to glitch or malfunction or something. I've seen a circuit board at work act up when it was screwed down too tightly (bending pressure must separate a hair-line crack in the chip or something). Otherwise, it's hard to imagine how a plastic cover could cause it to use AUX heat with it on and stick with the heat pump with it off (it's 45F out right now, BTW, lower than it was earlier when it called for AUX heat at 49F).

    Edit: I woke up this morning and the heat pump is still running (no aux) with the cover off the White-Rodgers thermostat. I can't believe that just taking the plastic cover off solves the problem. That cover must be either pushing on some component or interfering with something (clearly the temperature reading changes) enough to change its behavior. I hate to have to leave the cover off as a solution, though.
    Last edited by VonMagnum; 11-16-2013 at 03:16 AM.

  3. #9
    HVAC Thermostat Specialist

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    I don't think leaving the cover off is a solution at all... it is a band-aid for the problem. It sounds to me like it is a temp sensor issue. I would like you to fill the hole the wire comes through with putty or insulation. With the cover on it may be reading temps from within the wall instead of room temperature. Now put the cover back on and let it run a cycle or 2 and report back with your findings. If sealing the hole does not do the trick then I think it is time for a new thermostat or setup. As I said before, I like the thermostats that are actually dual fuel capable.

  4. #10
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    Quote Originally Posted by hvactechfw View Post
    I don't think leaving the cover off is a solution at all... it is a band-aid for the problem. It sounds to me like it is a temp sensor issue. I would like you to fill the hole the wire comes through with putty or insulation. With the cover on it may be reading temps from within the wall instead of room temperature. Now put the cover back on and let it run a cycle or 2 and report back with your findings. If sealing the hole does not do the trick then I think it is time for a new thermostat or setup. As I said before, I like the thermostats that are actually dual fuel capable.
    I'll see about sealing the hole, but I just went ahead and picked up a new thermostat on the way home. I wanted one with full automatic mode between heat and cool for fall/spring days anyway. I don't use the programming functions, so I just got a non-programmable Honeywell 3550D, which has full auto mode and heat pump support, which seemed to be highly rated and reasonably priced. If I had the wires for the external thermostat, etc. already there and a humidifier or something, I might go for one of those fancy new ones with WiFi, etc. but I don't feel like going trying to run more wires (yeah I know there are wireless units out there, but the external thermostat and fossil fuel kit are already paid for and they seem to work so this seemed like the most economical option.




    Edit: I just installed the Honeywell. There was indeed too big a hole around those wires, but I would have had to disconnected the system to remove the plate to get to it regardless. I caulked around it and put the new thermostat in. It appears to operate correctly, but of course you don't realize the little things you can't adjust until you have it installed. For example, I could leave the display lit all the time on the White Rodgers stat since the batteries were purely for keeping the time/programming set up. I'm not sure if this unit needs the batteries to operate or not offhand (I guess I can try removing them; it recommends changing them once a year so I'm thinking maybe it uses them to function rather than the wall power. The batteries in the White Rodgers were over 6 years old and still going fine. It lights up on the first button press, but it's harder to see the setting at a glance across the room (oh for that WiFi display on my iPod Touch on the higher end models...heh). There's no control for how soon either heat source kicks on (slightly adjustable on the White Rodgers between 0.75 degrees and 1.3; this unit appears to come one less than one degree, whatever it's set to since it rounds off I can't tell precisely). That's not a huge deal since I had it set to the smaller amount anyway. A more annoying feature is that the unit automatically kicks on aux heat if you increase the room temperature even ONE degree. The White Rodgers needed at least a 3 degree change (more sensible IMO since the heat pump can move the temperature 1 or 2 degrees at most temperatures). I do like the AUTO heat/cool mode, though (no option for that on the White Rodgers; it used a slide switch for heat/cool) and since it's non-programmable no annoying clock to have to set twice a year.

    So far it appears to let the heat pump do its thing as long as I don't increase the room temperature. That's what really counts. It does appear to read a bit higher relative to my mercury thermometer and thus the old thermostat by comparison (i.e. reads about 70 where the other one read 67 or 68 with the cover on and 69 with it off. My two mercury thermometers disagree with each other by 2 degrees oddly enough so I'm not 100% certain which is more accurate and thus it's not a big deal so long as it operates correctly.
    Last edited by VonMagnum; 11-16-2013 at 04:02 PM. Reason: New Thermostat Installed

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