Question about Heating & Cooling

3 Answers

Honeywell CM67ng thermostat not working. Have tried various programmes but still seems to have mind of its own. Can we replace with something else?

Posted by on

  • 2 more comments 
  • gennywalsh Nov 23, 2008

    I have the same problem, the heating is coming on at random times for 10 mins every 20mins and there is no reason for it. The main unit is off and just in case i have set the activation temp to makes lots of noise when its on which means trips to the loft at 3am

  • Anonymous Nov 23, 2008

    I have the same problem as well. It keeps coming on when it is set not too i.e. 3am!

  • Anonymous Dec 11, 2008

    its a piece of ****!!! throw it out the window

  • fhoh Jan 18, 2009

    Honeywell CM67NG

    Thermostat comes on at random times eg 3am, 6.30am, 5.15am despite being set for 7.30am. and then works perfectly at all other times



3 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

The cm67ng has a feature which attempts to get the temperature to the desired point before the actual time you set. In reality this "feature" just makes the device turn on and off randomly in a really bemusing fashion. You can turn this off with the following:

1, Set timer mode to "OFF"
2, Hold down "Info i" and press "prog 3" and "prog 4" together. Display Should show a spanner in the left hand corner.
3, press "prog 2"
4, repeated press "clock +" till the characters in the display after the colon read "OP" (the number before the colon seems to vary with model).
5, Press the "temp down" button. The 1 in the right hand of the display should become a 0.
6, Press the "info i" button to save your changes.
7, Switch the mode back to auto, the timer should now behave normally.

You should note that a number of other parameters can be changed in this service mode. Some of which could probably do bad things to your central heating system if set incorrectly.. So this is at your own risk! Either way it's best to read the installation manual before attempting to change anything:

Posted on Nov 10, 2009

  • Level 1:

    An expert who has achieved level 1.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

I had the same problem. The issue is that if you set the temperature to be 20 degrees at 8.00, it will ensure that the temperature is at 20 degrees at this time. I.e. it will set the boiler going well before this time. I was frequently woken up by the heating being on in the middle of the night. My solution works perfectly for me as I do not have complex requirements. I simply set the timer to be at say 10 degrees at 11.00 pm and again at 8.00 am, and then at 20 degrees at 8.20. This means that between 11.00 om & 8.00am is will maintain 10 degrees, but come 8.01 will be working flat out to try to achieve 20 degrees by 8.20!!
It works for me.

Posted on Sep 02, 2009

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

If it comes on at 4am instead of 7am try advancing the on time by 3hrs to 10.00am - this seems to work - until someone comes up with a "proper solution."

Posted on Jan 24, 2009

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

Failure of my Honeywell CM61ng wireless thermostat. Replacement advice

Probably not. There are replacement models available.
The T6661B programmable room thermostat is also known as CM61.
CM61 1 day wireless programmable thermostat is replaced by CM921.
CM61 1 day wired programmable thermostat is replaced by CM901.

Oct 21, 2017 | Heating & Cooling

2 Answers

Hi, I have just changed the bateries of a Honewell CM67ng wireless thermostat. The display now flashes a "Id -" text on the left-hand side (where the temperature is normally indicated/set). I...

Welcome to fixya


I have a solution for this

Press Ok, Accept or replay so we may get started

Your pre-solution is coming up shortly


My name is Bruce

Jan 17, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

Hi any ideas on why this happens, I have a a honeywell CM67NG wireless thermostat and it fires up the bolier(Alpha CD50) even when I have set the programmer for times and days. example I have set it to...

One possibilty is the therm has a antisipator setting, meaning Ex; at 7:00 you want 72*f,but the house is 62*f at 6:15 the therm will bring on the heat early so the house will be at 72*f@7:00.There should be a short lag if it is comming on at 4:00 it is something else.

Dec 08, 2010 | Honeywell Programmable Thermostat Heater

2 Answers

My Honeywell Programmable Thermostat RTH2410 operates intermittently, the entire unit , display and all, turns on and off at various times throughout the day.

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";} Hi,
You need to reset the t-stat and totally reprogram it...
Look in your manual how to do that or...

Here is a tip that tells you how to get a manual for most any Honeywell product online...

Manual Honeywell How to Find Honeywell Manuals


Sep 13, 2010 | Honeywell Focus 6300B 5-2 Days...

1 Answer

CM67ng will not turn heating off

Are you running some type of program on the tstat??

Jul 06, 2017 | Honeywell Programmable Thermostat Heater

1 Answer

I have two honeywell cm67ng wireless themostats and works on a timer settings. Recenently I ahve noticed that one of them is not working properly as it is not going off at the time it is supposed to go off...

Hi, I have worked with Honeywell products for years, and I have seen this type on occation. If they are wireless and on a timer that controls them, it may have a problem in the timer. See if this timer is split to operate each stat seperately. If so, find where it controls the stat that will not shut off at the correct time, and see if you see anything out of order. The stat senses the temperature and would shut this unit off when satisfied. I did find that this stat works on the basis of time and temp, and is obsolete. They are being replaced by the Honeywell CMT-927. I do believe you need to check the timer 1st to see if it is working for this side of the stat. You will need to read the instructions that should be with the timer.If the timer seems to be working fine, I would replace the stat in question as it has probably failed and will not respond to temperature or time when it gets its signal to shut down from the timer. Please keep me updated on this and we can go deeper into this and solve it.

Dec 20, 2009 | Honeywell Programmable Thermostat Heater

2 Answers

I have a Honeywell Thermostat CM67NG The flame symbol is showing on the thermostat, but there is no heat from radiators. The status code on boiler says there is ' no heat demand'. Boiler shows radiator...

You may have a broken thermostat wire. Disconnect the wires from the thermostat and please note what colors are hooked to which terminals. Cross the R and W wires and see if your heating system turns on. If it does not, you have a broken wire or bad connection at the heating system. If it does start, you have a bad thermostat or bad connection at the thermostat.

Nov 30, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Central heating thermostat

Looks like it was replaced by the CM67 series, try this link for the manual:


Feb 29, 2008 | Honeywell Programmable Thermostat Heater

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

2,454 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

Paul Carew

Level 3 Expert

3280 Answers

Dan Webster
Dan Webster

Level 3 Expert

8220 Answers

Tim Whalen

Level 3 Expert

3074 Answers

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

Answer questions

Manuals & User Guides