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No digital read out from Honeywell digital thermostat and no heat from oil fired forced air furnace

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Check/replace the batteries in the thermostat. They last about a year, and it won't work without.

Posted on Dec 14, 2016

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Posted on Jan 02, 2017

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Wires don't match the new thermostat posts. The wires from the furnace are Red,Blue black and white The posts in new thermostat are B O G Y not used R and Rc Can't figure which to put


The wire colors are for the following functions ......red - 24 volts white - heat yellow - AC green/blue - blower (fan) red is connected to the R with a jumper between R and Rc What type of furnace/heat do you have ???? Electric. oil, gas .Forced hot air, baseboard, steam, heat pump, or ?????? Different systems use different connections and need a specific thermostat for that application !!!

Dec 13, 2014 | Heating & Cooling

3 Answers

Honeywell thermostat blows cold air on heat


Thermostats don't actually blow anything, the heating system might though. Check the breakers for your heat system, then call a heating specialist. They're really not that expensive.

Oct 06, 2014 | Honeywell Heat/Cool Thermostat

1 Answer

Does thermostat have to be on Auto or On to make my heat come on?? Dont know if i have thermostat problem or Furnace problem. Furnace clix on whenever it wants to, doesnt use the schedule i have...


If the thermostat is wired correctly, and matched to the type of heat you have ie electric, heat pump, boiler, forced air, gas or oil, the heat should run in either Fan ON or AUTO. Maybe you can explain your system a little more in depth...furnace type, M#, & thermostat brand w/ M#.

Dec 12, 2013 | Honeywell Programmable Thermostat Heater

1 Answer

I am replacing an old Lennox thermostat with a new Lux DMH110 digital thermostat. My furnace(oil) has only two wires on the thermostat(heat only). I connected the wires according to directions of new...


Make sure on the furnace that you have the same colored wires connected at the thermostat to R and W. Check for good connections at both locations. You can always test to make sure the unit fires by crossing the two wires together. If the unit fires, you have a bad thermostat.

Feb 17, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

I have a honeywell thermostat model # th5220d1003-0636 & need to know what connections to make for gas forced air heat.


This is a Focus Pro 2 heat,2 cool thermostat. If you are connecting this to a single stage(1 heat) residential furnace then your connections are: At the thermostat the R and Rc therminals are internally connected so you can connect your R terminal wire from the furnace to the R terminal at the thermostat(this is your 24 volt supply for both heating and cooling. The W or W1 wire (heating) from your furnace you connect to the W1 terminal at the thermostat. The W2 wire from your furnace(if your furnace is a 2 stage furnace) you connect to the W2 terminal at the thermostat. The G wire from your furnace(indoor fan) you connect to the G terminal at the thermostat. The Y1 wire(cooling) from your furnace you connect to the Y1 terminal at the thermostat. The C wire(common or neutral) from the furnace you connect to the C terminal at the thermostat.

Nov 14, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Wc wiring on thermostat


sounds like you have a heat pump the w2 on old thermostat is for a second stage heat. If you can give me a little more information on type of system you have (forced air furnace with heat/cool, Heat pump or boiler)? How many wires are on old thermostat? Is it a no programmable or programmable? How old is the furnace?

Jan 17, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Forced Hot Air Heating system doesn't maintain thermostat setting


It sounds like you may have issues with the furnace. A qualified professional can go over the system and the house to let you know if the system and unit are properly sized. The poor performance of a furnace can be a sign of carbon buildup in the furnace.
Good luck, hope this helps.
Matt

Jan 10, 2009 | Honeywell Focus 6300B 5-2 Days...

1 Answer

Honeywell CT3611 thermostat, not working..


if you cross the two wires and you see a slight spark and heat comes on, then the problem is in the thermostat, if not then problem is at furnace it self.

Oct 24, 2008 | Honeywell Programmable Thermostat Heater

3 Answers

Honeywell dial theromostat.


since you say it has a blank face it must be a digital thermostat. if the power is on to the furnace and the furnace door is on (door switch) and still does not give you a reading. You probably have a bad stat. if you are handy.... unhook the wires in the thermostat. jump the red and white wires together. the furnace should turn on. if it does the thermostat is bad. if it does not turn on its not the thermostat its the furnace

Oct 07, 2008 | Honeywell Programmable Thermostat Heater

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