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The digital display on my heat pump thermostat do not display anything..

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It may run on batteries. check with your installer

Posted on Dec 10, 2008

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I have a thermostat RTH9580. Why do I have emergency heat under system AND heat which sometines switch automatically to auxilliary heat?


If you have an air to air heat pump, in colder temperatures, the heat pump will not heat as well as it would in warmer outdoor temperatures making it run longer. the digital thermostats work off of a built in algorithm that kicks on the auxiliary heat when the heat pump runs to long so that it will satisfy the thermostat quicker. This can be tied to the Emergency heat @ the thermostat energizing a few heating elements, or just energizing a separate element from the emergency heat. I always recommend on an air to air heat pump to run the emergency heat when you have consistent Outdoor temperatures below 20 degrees F because you will cycle the heat less by getting hotter heat making life more comfortable, and it costs about the same as running the heat pump since @ those temperatures, it will run all the time.

Jan 09, 2015 | Honeywell 7 Day Touch Screen Programmable...

1 Answer

DIGITAL DISPLAY NOT WORKING


check to see if power is coming in that display runs off of 120 volt

Mar 27, 2013 | Jandy Ae2500t 115,000 Btu Heat Pump

1 Answer

White Rogers digital thermostat displayed "lo".


Thank you for your interest with Emerson White Rodgers. My Name is Joselito Laxamana from technical department. After replacing the battery you need to do the reset operation. If you need further assistance please contact us at 1800-284-2925.

Sep 24, 2012 | Heating & Cooling

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What does the "auxillary heat"


Auxiliary Heat is used to turn the electric heat strips ON, If the heat pump is not working. Or if the heat pump can't bring the space temperature up to Set Temperature it will display Aux Heat ON....... Assuming you have a Heat Pump System with Auxiliary Electric Heat as Back up...... If the tech didn't install a jumper wire from AUX to W on the subase which is in back of the Display on the Thermostat.....you won't get Auxiliary Heat if the Thermostat is set for Auxiliary Heat. Other wise the thermostat will turn the heat pump on first and then the electric heat (Aux Heat) if it needs it to satisfy the set temperature....... Hope this helps

Apr 21, 2011 | Honeywell Electronic Programmable...

1 Answer

We have a White-Rodgers 90 series thermostat that started beeping last night. We have had it for about 4 years. Does it have a battery? I couldn't find anything about that in the manual.


Susan, the "90" series of thermostats covers a couple of different thermostats made by White-Rodgers. Here's how to find your model number. With that info, I can check the manual specific to your thermostat.

In the mean time, check the display for the word BATTERY or BAT. (Flashing) on the display. Battery flashing or blinking on the digital display indicates low batteries. If the batteries have recently been changed and the thermostat continues to indicate low batteries, use a pencil eraser to polish each of the battery contacts inside the back of the thermostat. Do not bend them up and down when polishing or you might break them. When complete, they should all be as shiny as a mirror. This will assure proper battery back-up, allow the backlight to work correctly and remove the flashing battery symbol from the screen. Battery (Solid) on Display The battery symbol (not blinking) indicates a loss of power (24 volts) from the heating and cooling equipment to the thermostat. Normally the heating and cooling do not operate when the battery indicator is on. If the battery indicator is on, check the fuses or breakers, make sure the furnace is switched on, and verify the blower compartment door is closed properly. The battery display is designed to indicate the thermostat is running on batteries, so replacing batteries has no effect on the indicator. See No Heat/No Cool for more information. Note: Some heat only systems (zoned systems) disconnect power from the thermostat during a normal heating cycle and display the battery symbol. Millivolt heating systems always indicate battery because they do not supply 24 volts to the thermostat.

A beep often is provided as audible feedback when keys are depressed on many thermostats. You should check to make sure that no key is stuck in the "in" position or is otherwise activated.

Jan 10, 2011 | White Rodgers Water Heaters

1 Answer

Heat pump will not start


Could be a firmware issue and require a new mother board. Unfortunately, you probably have done all you can on your own. Time to call the local HVAC service person...

May 03, 2009 | Hayward Heatpro 81k Btu Swimming Pool Heat...

2 Answers

Changed out a Honeywell Thermostat with an Aprilaire Thermostat


The smell is usually dust on the wires for electric resistance heat.The thermostat shouldnt have anything to do with it.

Nov 19, 2008 | Heating & Cooling

1 Answer

RTH7400 thermostat installed-screen display unlit-used page 10 wire installation. Used heat pump wiring-which does not show W2 and Y2 on heat pump schematic, so used conventional displayed W2 and Y2...


w2 and y2 are used for 2stage applications

w2 = 2 stage heat
y2= 2 stage cool

If your system is a single stage system, look for the y1 and y2 terminals. If the thermostat does not have y1 and y2 then you may have the wrong thermostat. As always, please read the directions carefully. Thanks!

Jul 03, 2008 | Heating & Cooling

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