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Totaline P274-1200 flashing all characters

1999 Carrier Model 38BYCO48310 A/C Heat Pump; Totaline P27-1200. The display presents all the options on the screen simultaneously, then momentarily returns to the normal display, then E2, then back to all options (displays off, heat, cool, e heat.. fan is on and auto, the room temp is reading -HP, time 1888, all the days of the week, etc). I hear a distinct click sound at the thermostat as it flips between these three displays (all-options, normal view, E2). Came home to this, so that's all I have. The A/C isn't turning on as I would expect based on the programming, but I really cannot see the thermostat setting since none of the buttons seem to change the display. Any suggestions?

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  • 32 Answers

Check the conections try contact sprey

Posted on May 13, 2014

Testimonial: "no change. in case it wasn't clear... the display is usually on the all-options, then momentarily displays the normal screen then E2, then back to the screen with all the text displaying."

  • George Andoniades May 14, 2014

    usually E2 is the indoor temperature sensor

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The thermostat would need to be insulated better from the air that is surrounding it. Im assuming that the thermostat is located on the wall unit where it blows out the air. This could mean that it is actually reading more from the outside temp, than whats inside the house. Another thing to consider is the location of the thermostat, even it being close to anything in the house that produces some kind of heat will effect the condition of the air. If anything, its the manufacturers mistake if it was properly installed in the first place and if defective, they should replace it. hope this helps.

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