Question about Honeywell Programmable Thermostat Heater

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Need help with rth230b

T-stat has worked fine for 2years now. Recent problem is that program 3 is set for 70 but temp will not rise above 63. Furnace turns on but shuts off after about 1 minute. Readouts are all accurate.

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Re: need help with rth230b


Posted on Jan 26, 2008

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It is increasing temp 2 hours before scheduled

Most programmable thermostats are "smart stats" which use a programmed algorithm base on a preprogrammed P (proportional) I (Integral) D (derivative) Loop. To make a long story short, the programmed temperature will make the room that temperature by the programmed time. This is based on how long it has taken it in the past to bring the room up or down to temperature. So if your setpoint is 70, and your set time is 7 AM, then the furnace or AC will bring the room to that temperature by the set time...not start at the set time.

Dec 04, 2013 | Thermostats

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I just installed a honeywell 5-2 progammable thermostate.. Everything is hooked up fine and I have my days, hours wake, sleep, leave...etc all set, but when it goes on.. for example, I have it set for...

You didn't include a model number, so it's hard to know for sure - but I'll take a stab at this one. Many of these t-stats have a programmable offset to reduce "hunting". This can be as little as 1 degree or more than 2 degrees.

This means if you set the offset to 1 degree and the room temperature to about 65 degrees, the furnace will heat the room until the t-stat registers a rising temperature of 66 degrees. The furnace shuts off and will not turn on again until the t-stat registers a falling temperature of 64 degrees. The average is 65 degrees, and prevents the furnace from starting and stopping numerous times instead of just once with the 1 degree offset.

You can further reduce the number of furnace start and stops by increasing the offset to 2 degrees. This would work like this when the t-stat is set to 65 degrees and the room is cool:

Room Temp Furnace
63 On
64 On
65 On
66 On
67 On
68 Off

The room is now warm and heat or furnace is off. The room begins to cool like below:

67 Off
66 Off
65 Off
64 Off
63 Off
62 On

With a 1 degree offset, the room temperature varies +/-1 degree (about 2 degrees total). With a 2 degree offset, the temperature about varies +/ -2 degrees (about 4 degrees total).

Also, when the thermostat shut the heat off, the heat that was made is delivered to the space instead of wasted by sending outdoors - so the room will get a little warmer even though no fuel is being burned. The same holds true at the other end. When the t-stat turn heat on, fuel is burned, but there's little heat until the source has reached the optimum temperature and then the heat is delivered to the space.

I hope this helps & good luck! Pleas rate my reply - thanks!

Jan 24, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

I had my 3 year old mid-efficient furnace serviced a few months ago. I have a 4 room small bungalow. The Honeywell thermostat is set to say 72 and it says it reached 72. However, an independant...

Sounds like the switch that controls the blower is faulty. It should heat up then come on at preset temp. As for the stat where is it located. It should be located 60" off the ground not in any direct sunlight and make sure it is insulated behind the stat. You could have more heat loss in those rooms too. IE poorly insulated windows air penetrating through outlets do those walls face the wind? Is the stat located next to a heat supply?

Dec 16, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Hello. Our RTH230B thermostat has a mind of it's

I think your feedback temp sensor has faulted, get it looked at.

Jan 24, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

I've just replaced our old dial thermostat with the RTH230B,but the heat isn't kicking on. It's a 2 wire system, and I installed exactly as the instructions said. Any ideas?

Hopefully the instructions told you to hook the two wire to the Rh and the W terminals. Double check that. Also sometimes the way the terminals are labeled it is easy to get then mixed up. If you are on those two terminals and the t-stat is programmed properly then it should be starting your furnace when you set the temperature higher then the set point.
If not it could be that you got a bum t-stat right out of the box, Yeah, it does happen on occasion.

Nov 17, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell RTH230B a/c problem

if you set the thermostat on 70 and your house won't get ant cooler than 72, there is a problem with your system,not your stat. I'm thinking you are low on refrigerant if it is somewhat working. when the unit is running, if you can get your hand on the larger refrigerant line under the black insulation, it should be cold, about 55 degrees.

Jun 19, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

My problem is....On my new Honeywell RTH230B thermostat the color code is Rh, Rc, W,Y and G. My wire colors are red, orange, blue, white and black. I can obviously match up 4 of them but where the heck...

First you are using abnormal wire colors for a furnace. Second.... if you have an air conditioner hooked up to this furnace, you will need to install a jumper wire between rh & rc. I am assuming this is a natural gas furnace. Usually the red wire to R terminals. Usaully the white wire to the W terminal. Take the door off of the furnace. Find the thermostat wire connection in the furnace. What ever color wire is on the R terminal in the furnace should hook to the R terminal on the t/stat. Whatever color is on the W in the furnace goes on the W on the t/stat. Whatever color is on the G terminal in the furnace goes to G on the t/stat. And the Y in the furnace to the Y on the stat. and the G in the furnace to the G on the stat. Most applications use only the R, W, G, & Y ( always put the jumper wire between Rh & Rc)
Good Luck
Hvac Teacher

Mar 26, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Temp shows 2 degrees warmer than what is was set to

sometimes the furnace does a better job than anticipated, i wouldn't worry about it, especially if the furnace shuts off.
the setpoint is the temperature you want it to be
cycle lenghts are determined by how much recovery you are requesting. for instance, in the morning when you wake up, you want the temperature to be at its setpoint. what the thermostat will do is make the furnace run a limited lengths during the recovery process.

Nov 11, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell rth230b thermostat doesn't work

On most Honeywell Digital T-stats there is a 5 min delay built in

Oct 23, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell rth230b won't shut off heat

Sounds like a relay sticking. Possibly in the thermostat or possibly the furnace relay at the furnace. The next time it happens, unplug the thermostat from the wall. If the furnace still runs then it's the furnace relay.

Hope that helps...


Mar 07, 2008 | Honeywell Programmable Thermostat Heater

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