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The emergency heat will turn on at random when the cool position is selected, running at the same time. changed out the old thermostat with a digital one but it does the same thing RUUD Heat Pump

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Possible that the control unit is faulty , the thermostat may not have been the issue but an erratic control.
So check this unit out for errors.

Posted on Sep 28, 2010

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Unit not working correctly. The unit worked for the winter, few days ago I turn on the AC and noticed that it wasn't cooling like it should.


It's could be the board or a heat relay. See if you have 24 volts on "x2" im assuming, emergency heat when in cool mode if so it's the board. Or unhook black or x2 or your emergency heat from board and run unit in cool. If heat stays on its a relay

Jun 02, 2016 | Heating & Cooling

Tip

The Honeywell TH811U1003 thermostat is a universal programmable thermostat that...


The Honeywell TH811U1003 thermostat is a universal programmable thermostat that gives you electronic control of 24V AC heating and cooling systems. It also has the capability to be used on 750mV heating systems

One of the best features of this thermostat is it’s big clear backlit display. The current temperature, the set temperature and the time of day are displayed at all times. Simply touching the screen also activates the back light feature.

8787bd3.jpg


This thermostat has a menu programming guide the helps you through the process of setting up your schedule. You are able to select multiple days and customize the thermostat for any kind of unique schedule you may have. This thermostat also let’s you take it off the wall and still be able to program it. This lets you watch TV and program it at the same time.

f50b51b.jpg

There are built in backups that will hold the time for you if the power goes out. This t-stat will also update for daylight savings time. There are HOLD features that allow you to modify your program and hold it and then go back to the original.

Change reminders that are built in include the air filter, UV light, humidifier service and of course the batteries of the thermostat. The blower of you furnace can also be programmed to run extra to help increase the air quality in your home.

If you decide you want to know the outdoor temperature you can purchase an additional sensor and then hook it to you thermostat. The outdoor temperature will then be displayed on you thermostat. This feature also gives you the capability of using the sensor to monitor indoor temperatures remotely.

This thermostat will keep you very comfortable as the variation typically in temperature from set point is less than 1 degree F. The thermostat after a period of time learns the characterizes of the way the house or building heats and cools and then adjusts to get the most efficient operation of the heating or cooling system while maintaining a very close temperature tolerance.

By changing a few of the parameters in the thermostat this can be can be configured for either single stage conventional heat/cool systems or any single stage heat pump system.


Specifications of the Honeywell TH8110U1003 Thermostat
  • Description: VisionPRO Touchscreen 7-Day Programmable 1 Heat/1 Cool
  • Conventional and Heat Pump Thermostat
  • Application: Gas, Oil or Electric; Heat Pump; Millivolt
  • Programmability: Universal Programming from 7 Day to Non-Programmable
  • Changeover: Auto or Manual
  • Color: Premier White
  • User Interface: Touchscreen
  • Switch Positions (System): HEAT-OFF-COOL-AUTO
  • Switch Positions (Fan): AUTO-ON
  • Power Method: Battery or Hardwired
  • Terminal Designations: R, RC, C, W (O/B), Y, G, S1, S2
  • Dimensions (in.): 4 9/16 in. high x 6 in. wide x 1 1/4 in. deep
  • Mounting: Horizontal
  • Electrical Ratings: 20 to 30 Vac
  • Frequency: 60 Hz. 50 Hz
  • Setting Temperature Range (F): Heat: 40ª F to 90ª F. Cool: 50ª F to 99ª F
  • Setting Temperature Range (C): Heat: 4.5ª C to 32ª C. Cool: 10ª C to 37ª C
  • Differential Temperature (F): 1ª F
  • Differential Temperature (C): 0.5ª C
  • Stages: Up to 1 Heat/1 Cool
  • Outdoor Sensor: Yes, optional outdoor or indoor remote
  • Remote Sensor: Yes, optional outdoor or indoor remote
  • Sensor Element: Thermistor
  • Currents (Heating): 1.0 A running
  • Currents (Cooling): 1.0 A running
  • Currents (Fan): 0.6A running
  • Operating Humidity Range (% RH): 5 to 90% RH, non-condensing
  • Comments: Selectable to and Heat Only or Cool Only
  • Features: Screen lock


on Jan 15, 2010 | Hardware & Accessories

Tip

Th811u1003


The Honeywell TH811U1003 thermostat is a universal programmable thermostat that gives you electronic control of 24V AC heating and cooling systems. It also has the capability to be used on 750mV heating systems

One of the best features of this thermostat is it’s big clear backlit display. The current temperature, the set temperature and the time of day are displayed at all times. Simply touching the screen also activates the back light feature.

This thermostat has a menu programming guide the helps you through the process of setting up your schedule. You are able to select multiple days and customize the thermostat for any kind of unique schedule you may have. This thermostat also let’s you take it off the wall and still be able to program it. This lets you watch TV and program it at the same time.

There are built in backups that will hold the time for you if the power goes out. This t-stat will also update for daylight savings time. There are HOLD features that allow you to modify your program and hold it and then go back to the original.

Change reminders that are built in include the air filter, UV light, humidifier service and of course the batteries of the thermostat. The blower of you furnace can also be programmed to run extra to help increase the air quality in your home.

If you decide you want to know the outdoor temperature you can purchase an additional sensor and then hook it to you thermostat. The outdoor temperature will then be displayed on you thermostat. This feature also gives you the capability of using the sensor to monitor indoor temperatures remotely.

This thermostat will keep you very comfortable as the variation typically in temperature from set point is less than 1 degree F. The thermostat after a period of time learns the characterizes of the way the house or building heats and cools and then adjusts to get the most efficient operation of the heating or cooling system while maintaining a very close temperature tolerance.

By changing a few of the parameters in the thermostat this can be can be configured for either single stage conventional heat/cool systems or any single stage heat pump system.

Normal 0 MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman";} Specifications of the Honeywell TH8110U1003 Thermostat
  • Description: VisionPRO Touchscreen 7-Day Programmable 1 Heat/1 Cool
  • Conventional and Heat Pump Thermostat
  • Application: Gas, Oil or Electric; Heat Pump; Millivolt
  • Programmability: Universal Programming from 7 Day to Non-Programmable
  • Changeover: Auto or Manual
  • Color: Premier White
  • User Interface: Touchscreen
  • Switch Positions (System): HEAT-OFF-COOL-AUTO
  • Switch Positions (Fan): AUTO-ON
  • Power Method: Battery or Hardwired
  • Terminal Designations: R, RC, C, W (O/B), Y, G, S1, S2
  • Dimensions (in.): 4 9/16 in. high x 6 in. wide x 1 1/4 in. deep
  • Mounting: Horizontal
  • Electrical Ratings: 20 to 30 Vac
  • Frequency: 60 Hz. 50 Hz
  • Setting Temperature Range (F): Heat: 40ª F to 90ª F. Cool: 50ª F to 99ª F
  • Setting Temperature Range (C): Heat: 4.5ª C to 32ª C. Cool: 10ª C to 37ª C
  • Differential Temperature (F): 1ª F
  • Differential Temperature (C): 0.5ª C
  • Stages: Up to 1 Heat/1 Cool
  • Outdoor Sensor: Yes, optional outdoor or indoor remote
  • Remote Sensor: Yes, optional outdoor or indoor remote
  • Sensor Element: Thermistor
  • Currents (Heating): 1.0 A running
  • Currents (Cooling): 1.0 A running
  • Currents (Fan): 0.6A running
  • Operating Humidity Range (% RH): 5 to 90% RH, non-condensing
  • Comments: Selectable to and Heat Only or Cool Only
  • Features: Screen lock

on Jan 15, 2010 | Heating & Cooling

1 Answer

When thermostat turned up furnace ignites, heats and fan starts when plenum is up to temp. When thermostat is turned down flame goes off but fan continues to run.


If your furnace is relatively new, as in 10 years old or less, there should be a field adjustable 'cool down' cycle. On the circuit board there should be a dip switch or series of dip switches with 30, 60,90,120 indications. These numbers represent the length of time the relay on the circuit board allows the fan to run AFTER the thermostat satisfies. You may be able to adjust the time frame down one position from where its positioned now.


The second possibility, if the blower never shuts off at all is that the relay itself could be stuck in the closed position and keeping the fan on.

Sep 30, 2015 | Heating & Cooling

1 Answer

My thermostat has both auxillary and emergency light on,both are green,what does that mean?


Aux light; This turns on when the auxiliary (second stage) heating is in operation
It turns on 1-6 F below first stage and is user adjustable

Emergency light; This light turns on whenever the emergency heat is manually selected
(Mode switch is in the EMER position)
While in the emergency Heat mode, the heat pump compressor is off,
and the emergency heat (same as the auxiliary heat) maintains the
set point temperature

Jan 22, 2014 | Computers & Internet

1 Answer

New thermostat not cooling. Blowing heat instead.


Hello You have only 5 wires? multi stage if so ,is run by something else.Check that RH/RC is jumped out on new stat.Also check that O is not on the B terminal.If there is an A/B select switch set it to O.Emergency heat button dont matter as there is no wire to run it with only 5 wires.

Apr 17, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Heater works, but only on Emergency Mode


It sounds like you have a "setback thermostat" A control intended to increase efficiency by allowing the fan to run for an adjustable amount of time after the heater turns off, whether the heater is electric or part of a heat pump. If the "setback" time is too long, the element will cool off and the fan will blow cold air. Try and locate the instructions for the thermostat and see if the "fan run time after heat turn off" is adjustable and reduce it by half. Most emergency heat circuits bypass control circuits (its an emergency, you know), and require manual control.

Jan 11, 2010 | Heating & Cooling

2 Answers

My air handler comes on ,not the outside unit when my thermostat is in the off position even if i turn the thermostat down to 50 and have it turned off the air handler comes on for about 5 to 10 minutes...


If you have a standard thermostat the fan switch is for the air handler only. It completely over rides the thermostat for most settings. Now lets see this is what I'd expect:
fan switch on Indoor fan runs all time
Fan switch auto Indoor fan only runs when thermostat is set to cool or heat and the thermostat is turned up above room temp for heat or below room temp for cooling. In both of these modes the furnace blower comes on and stays on til the room temperature is satisfied. The outdoor unit only comes on for AC the out door unit will not come on for heat or the "on" setting on the thermostat. See exception 1 & 2 below...

Exception 1- (in a heat pump the out door unit runs in both heat and cool mode unless it has emergency heat turned on then it will not come on outside in the heat mode, and depending on the type of heat pump and furnace or air handler it is). A heat pump thermostat usually has "backup heat" and an "emergency heat" setting switch on the thermostat.
Exception 2 - On some thermostats they are made to cycle on the heat if the temperature reaches a preset temp (around 50'f usually but definitely by 40'f). This mode prevents freezing when if instance the homeowner is away or while the home is under construction. In this mode the fan inside can run but the heat usually comes on with it.
Exception3 - On some electric furnaces the heating strips may be individually controlled and thus not all come on at one time. This may give the feel of no heat especially if the room is cold.

Now there may be other exceptions but Ive tried to give you a heads up on some of the most common ones.
If you need more help please post more specifics about your unit/system as to for sure what switches are set to what setting and what is happening with each. My first though was that maybe your system is OK and you needed to know if the thermostat was working properly.

If this helpd you understand your problem would you please give me as hifgh a mark as you can. Thnaks for using fixya and good luck.

Mar 28, 2009 | Carrier Heating & Cooling

1 Answer

High Electrical bill - Appears to be heatpump problem.


Sound like there are running on emergency heat which is elrctric.Have the system checked out buy a local heating and cooling company. Have they checked the filter and changed them.

Jan 14, 2009 | Honeywell Electronic Programmable...

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