Question about Honeywell Programmable Thermostat Heater

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T8411r1028 honeywell thermostat

No pwer blank screen

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  • volkerchrist Dec 17, 2008

    the thermostat is blank and it tripped we think the breaker in the garage any suggestions please

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Also check the water sensor in your drain piping if you have one. If it's sensing water backing up, it will blank that display.

Posted on Oct 06, 2009

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Check in the heating unit itself for an automotive style fuse.

Posted on Dec 18, 2008

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Thermostat is not coming on we are in san antonio is there help out there for us


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The thermostat worked correctly for months then


Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need

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It actually sounds like the batteries are going dead if the 24v from the furnace are not providing the power to the thermostat.

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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

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T8411r1028 honeywell thermostat blank screen where would fuse be?


That thermostat should get power from 24V side of a transformer in the air handler. There should be a fuse in there on the PCB, but just as likely, there may be a 2-wire sensor in your drain trap that will shut it down if it senses water backing up in the drain piping. Clear that line from the outside of your house with a shop vac, cycle the breaker for the air handler if needed. You may also be low on freon, though, so a service call might be a good idea anyway.

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