Question about Heaters

1 Answer

Honeywell T87F Thermostat

Was having problems with heater shutting off without reason. Hoping the termostat was the fix, I took the outer cover off and saw a little calibration scale, I moved it back and forth and put it back where I thought it had started and then I heard the heater kick back on. I beleive it is fixed, but I was hoping to know what it is I did, or more so what that calibration scale is and how to use it correctly.

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 9 Answers

This calibration is called the heat anticipator, this is set by the amp draw pulled through the t-stat,if you look very close at the scale you will see the word longer with an arrow ,if you push the lever in the direction of the arrow the heat will run longer .This is a very old style t-stat and is most likely out of calibration on the temp reading for the room, think of this portion of the t-stat as a stand alone thermometer,it may read 70 when the room is 74

Posted on Jul 02, 2013

5 Suggested Answers

Therinnaiguy
  • 1420 Answers

SOURCE: boiler will not shut off

Boilers are controlled by a few things, one being a thermostat, secondly a zone valve or circulator control and thirdly by an Aquastat that controls the boiler temperature and safety shutoff. If one of those controls is sticking, your boiler will turn or remain on until it reached a temperature where the safety control shuts it off. If your boiler is not shutting off at all, most likely it is the Aquastat control. The Aquastat will be located on the boiler and may have "Honeywell" printed or stamped on it. Take off the front cover and you will find model numbers on the backside of the cover. If you have some mechanical skills, you could probably replace it. Turn off your power first and wire it wire per wire.
If your boiler is shutting off on high limit, I would suspect a stuck zone valve or circulator control or a bad thermostat or shorted thermostat wire.

Posted on Nov 15, 2007

Therinnaiguy
  • 1420 Answers

SOURCE: Thermostat not working

Chances are that the fuse in the furnace blew. Remove the inspection cover on the furnace and look for a 3 amp fuse either in-line of the wiring or on the control board. Also check the circuit breaker box.

Posted on Nov 21, 2008

  • 27 Answers

SOURCE: Honeywell PRO TH4110d Prog Thermostat not responding

cfheck to make sur ethat the t-stat is set for your type of heat. if you do not go through the instructions sep by sep then you will have problems. if you have then call a professional.

Posted on Nov 26, 2008

Benimur
  • 6966 Answers

SOURCE: Dy/night heater turns on for 10 sec then and off, over and over

Hi and welcome to FixYa,

If I understand your concern, it is that the heater switches itself on for 10 seconds and then switches itself automatically off. A couple of ideas of you may want to explore/check:

  1. the built-in protection system detects an internal fault and to prevent any further damage switches itself off;
  2. the faults could be:
  • open heating element (assuming it is electrical);
  • blower not turning;
  • open limit switch. The limit switch is an inline cutoff to the heater that automatically opens up when the heater exceeds a pre-determined temperature independent of the settings in the thermostat. This is like a thermal fuse once gone bad will remain open;
  • whereas a thermostatic switch will turn on if temperature is below its threshold and turn off if the temperature is above. It is basically an on/off switch.
Often the limit switch would look like the image below.
7d0829b.jpg
To be able to provide a more detailed information/assistance, pls verify & post back the model number of the Day Night Heater. Model 8ou-19 does not turn up anything. Or perhaps you can share the website you were referring to.

Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 21, 2008

billyvangogh
  • 108 Answers

SOURCE: Replaced mercury thermostat w/Honeywell CT87K - doesn't work!

You need a specific thermostat for a Wall Furnace it is a Millivolt Thermostat and not a 24v standard thermostat....usually it will work anyway however if the powerpile (generator produces millivolts from the pilot light) is weak it may not be producing enough...or the Pilot light may be dirty and lazy...won't produce enough millivolts ...or you can have bad or dirty contacts or connections....or a combination of any of the above.....a 24v Thermostat and particularly a non-mercury thermostat has too much resistance in it for a millivolt system....as your Wall Furnace (other than the fan) runs on less than 1 volt

Posted on Oct 31, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

How to reset the thermostat to shut off after 2 degrees/CT87B-4008?


on these thermostats remove the outer ring cover and in the lower right side you will see a slide adjustment. move it i believe left for closer cycles and right for longer cycles. it should be 2* on either side of set point. remember that the fan is not furnace shut off.and turning back and forth will not tell you anything. just set it and see how it works then change it again if you need to

Oct 13, 2014 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

My heater won't shut off. The thermostat is off but the heat stays on. What do I do.


Turn the circuit breaker (in your home's circuit breaker panel) that feeds that heater OFF. After the heater cools, remove the cover and check to see if the Thermostat wires have come loose. It may also be an electrical relay problem or the wall thermostat has gone bad.

Feb 18, 2011 | Honeywell (CT62B1015) Baseboard Heater

1 Answer

OLDER WHITE ROGERS PROGRAMMABLE THERMOSTAT. BATTERY INDICATOR WILL NOT GO OUT AFTER REPLACING BATTERIES. CANNOT SET UP PROGRAM. BATTERY INDICATOR REMAINS ON.PUT IN THREE SETS OF BATTERIES, STILL THE SAME.


Try removing the battery and disconnecting the "R" wire for approx 10 minutes, then reconnect and reinstall good battery........sort of like restarting a computer.......we're hoping this will reset something. If you continue to have problems and are certain without a doubt that the battery is good, then the problem is in your thermostat.

Apr 02, 2010 | Honeywell Electronic Programmable...

1 Answer

Furnace does not shut off ... temp set at 68 degrees and its up to 80 degrees ... had to shut furnace by main switch ... is it the termostat


Easiest way to find out is to disconnect the thermostat or at least the red wire on the thermostat. If it stops, it's the thermostat. If it continues, you will need to disconnect the wire going to the R terminal on the control board. If it stops, it's a crossed thermostat wire. If it continues, its a problem with the control board or relay and you will need a technician.

Mar 09, 2010 | Honeywell CT3200 5-2 Day Electronic...

1 Answer

I want to replace programmable thermostat with old dial style


The terminals should be the same on both thermostats, except for C- common.
R- usually RED, goes to hot side of transformer,
W- usually WHITE, goes to heat
Y- usually YELLOW goes to outdoor unit
G- usually GREEN goes to furnace blower
Any of the other wires just cap them off you don't need them. If you have an Rh and Rc terminal instead of R and don't have them on the programmable then put a jumper from Rh ro Rc.
If you need more, then let me know what terminals you have on both t'stats and brand of furnace and AC, if you have a heatpump then there's more wires let me know.

Oct 13, 2009 | Honeywell CT87B ROUND HEATING&COOLING...

2 Answers

What do the batteries in the thermostat do? The gas heater does not come on. Could the reason be the batteries in the electronic thermostat?


Hi,

Without Batteries, they would not work.

Bingo!! It might be one of the reasons.Change the battery and see if that would fix the issue.

If problem persists, let me know.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Sep 28, 2009 | Honeywell Electronic Programmable...

1 Answer

Gas heater shuts off & won't come back on


sounds like the thermostat replaceing it should help you could try cleaning the old one they can get dust it them

Feb 25, 2009 | Honeywell CT87B ROUND HEATING&COOLING...

4 Answers

Replacing thermostat


What is the blue hooked up to now?

Jun 07, 2008 | Honeywell Electronic Programmable...

4 Answers

Boiler will not shut off


boiler does not shut off when thermostat reaches temp, i already replaced aquastat but condition still exists

Nov 14, 2007 | Heaters

Not finding what you are looking for?
Heaters Logo

Related Topics:

160 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heaters Experts

paulcarew

Level 3 Expert

1875 Answers

Dan Webster
Dan Webster

Level 3 Expert

8147 Answers

Mack Baxter

Level 3 Expert

379 Answers

Are you a Heater Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...