20 Most Recent Honeywell TH4210D1005 Heater Questions & Answers


google the model number on the stat..It will take you to one of honeywells site, where you can download the instructions.

Honeywell... | Answered on Feb 08, 2018


All gas furnaces have a pilot light. On the On/off dial, look for the word "pilot" turn it to pilot and press. You should be able to find where he gas is coming from(small stream) let go and air out the area. Press in the button and apply a long match or torch to light the pilot. Keep pressed for about a minute, then let the button go slowly.
If it stays lit, turn the dial to 'on' then the dial at th thermostat should do the rest.

Honeywell... | Answered on Dec 20, 2017


It depends on your system some will only work with hot water on and heating do you have two zone valves?

Honeywell... | Answered on Sep 27, 2017


Sounds like either a short between the G and R t stat wires or the relay in the control board is faulty. Easy way to check is remove the G wire from G terminal on the control board, if the blower stops, there is a short in tje t-stat wiring, if it continues to run a new control board will be needed since the relay is part of the board.

Honeywell... | Answered on Jan 08, 2013


what do i do?

Honeywell... | Answered on Nov 26, 2012


Sounds like it's low on refrigerant.

Honeywell... | Answered on Aug 08, 2012


Red (power) from furnace to thermosat R ...... White(heat) to W on thermostat

Honeywell... | Answered on Sep 18, 2011


Here's a link ...... http://www.honeywell-thermostat.com/manuals/th4210d1005manual.pdf

Honeywell... | Answered on Mar 28, 2011


if your talking about your T stat control for heater will not turn on replace it it,s bad

Honeywell... | Answered on Feb 23, 2011


try this. open the front of your furnace and look for the thermostat wires. i' dont know what you have but anywhere from 2 to 6 wires in something like a phone wire .find the termial board and take the red wire off. then close the furnace back up making sure the doors are on correctly.did this stop the frunace from running? if so you have a short in the thermostat wiring. check it to see where it is shorted out .replace the red wire and away you go.

Honeywell... | Answered on Feb 02, 2011


http://customer.honeywell.com/honeywell/ProductInfo.aspx/TH4210D1005. go to the bottom of the page and download the instructions

Honeywell... | Answered on Feb 01, 2011


For temporary heat while you shop for a new thermostat, take the wire off terminal R and cross it with the wire on terminak W. This will start heat cycle and will run as long as you have the wires crossed. Do not keep wires crossed more than 10 minutes each time you do it.

Honeywell... | Answered on Jan 23, 2011

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