Question about Honeywell Programmable Thermostat Heater

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My screen went blank on my thermostat from Totaline P374-1800 and the little light also is off. The only thing that appears to be light is in the arrow pointing up. N the fan seems to be on but i cannot get it to turn off since the screnn is blank. My house is getting very hot. Please help

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Posted on Jan 02, 2017

  • 24 Answers

SOURCE: Chronotherm III Thermostat Completely Blank Screen, No Heat

One of two things either the disply has gone out which is likely as it is a common failure for that thermostat or your heating unit is not sending control power. the older chronotherms were system (24volt ac) powered the new hardware/box store units are battery powered. Either way display should not be blank with fresh batteries. to get heat on remove the thermostat jumper or twist together the wire from the R terminal with the wire from the W terminal. note the color of each wire for later reference, heat up house disconnect wires from each other and go purchase a new thermostat

Posted on Dec 18, 2008

jeffbvegas1
  • 520 Answers

SOURCE: A/C not turning on - Digital screen is blank

Your honeywell should have battery back up but the primary power for this is a 24 volt transformer located in the air handler probably in your attic. All these controls run on 24 volts

Posted on Jul 11, 2009

shastalaker7
  • 1515 Answers

SOURCE: TOTALINE thermostat P374-0200 blank screen

Hi, If this stat has batteries, change them. If not, go to the furnace and pull the panels. If you have a circuit board, look for a small 3 to 5 amp plug in fuse, the kind you would use in your auto. It may be blown. Turn of power before you take it out and look at the metal in the fuse to see if it is burned or black, a hot spot. Replace fuse and see what happens. If no board or fuse, get back to me with more information on the kind of heater you have, gas, elect, wall heater, heat-pump ect. You have lost your 24 volt power supply if you have no batteries in stat. Let me know. Merry Christmas,
Shastalaker7

Posted on Dec 25, 2009

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Thermostat Totaline P7470100


It's probably the liquid crystal has a crack and is flowing inside the glass. It can only be repaired with a new display.

Why not contact Totaline directly and see what they can offer?



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Replace the batteries first. If that does not fix it, you either have lost 24V from the furnace/airhandler, or the thermostat is bad.


You may get lucky and find that the only problem is a blown 3 or 5 amp fuse on the board. Although that usually indicates a short somewhere in the system.

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