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  • FIRST POST
    • Ruski
    • By Ruski 2nd Jan 12, 12:19 AM
    • 1,250Posts
    • 712Thanks
    Ruski
    Honeywell CM927
    • #1
    • 2nd Jan 12, 12:19 AM
    Honeywell CM927 2nd Jan 12 at 12:19 AM
    After extolling the virtues of the said programmable thermostat, I'm now going to look really stupid and tell everyone that it failed on me today - coincidentally the first day of the year - I'm hoping it's not some 12 year delayed millenium bug!

    Anyhow - hoping kanuckle et al who have experience in fitting these things can tell me that they've come across this before:
    Wireless remote unit is working - but the display is blank - the backlight works and it still functions properly, I just can't see anything on the display itself.
    Yes - tried the batteries etc etc and the unit is two months old.

    Please tell me these things just give up somethimes and I'll go back to supplier tomorrow to try a swap... if I'm very lucky

    Cheers in advance guys and gals

    Russ
Page 3
    • Ruski
    • By Ruski 16th Nov 15, 10:19 PM
    • 1,250 Posts
    • 712 Thanks
    Ruski
    https://goo.gl/photos/7MVGMjSuSvDxV8GM8
    Last edited by Ruski; 16-11-2015 at 10:30 PM.
    Perfection takes time: don't expect miracles in a day
    • lozzaw
    • By lozzaw 16th Nov 15, 10:35 PM
    • 8 Posts
    • 0 Thanks
    lozzaw
    Sorry Ruski I actually worked it out after posting my original message (which I have edited!) Thanks for your help anyway. It doesn't seem to have made any difference to my display yet. The advice was to do it a few times, so I guess I'll just keep trying. Thanks again
    • Ruski
    • By Ruski 16th Nov 15, 11:12 PM
    • 1,250 Posts
    • 712 Thanks
    Ruski
    Yeah, heat the edge of the white pad and then firm it back down along the ribbon : I did this several times...

    HTH

    Russ
    Perfection takes time: don't expect miracles in a day
    • Les Jones
    • By Les Jones 9th Jan 16, 8:04 PM
    • 2 Posts
    • 3 Thanks
    Les Jones
    I had the same problem with the LCD starting to miss parts of the displayon my CM901. It is just under 5 years old. I tried the suggested method heating the connection from the LCD where it connects to the PCB. In my case it made the display worse. I did some research on the web to see how the joint was made in manufacture. The information suggested that the joint was heated to above 130 Deg. C (But it did not give a maximum temperature.) and a pressure of about 30 Kg per square centimetre. I made a tool to heat the joint and apply pressure and it fixed the problem.
    I have only used it once so it may not always work.
    There are some details of the tool I made on my website. I will post the URL when I am allowed to do so.

    Les.
    • Les Jones
    • By Les Jones 20th Jan 16, 11:50 AM
    • 2 Posts
    • 3 Thanks
    Les Jones
    You can now find more information for my post #44 (09/01/16) by Googling "Repairing Honeywell CM901 display fault"

    Les.
    • Ruski
    • By Ruski 20th Jan 16, 3:39 PM
    • 1,250 Posts
    • 712 Thanks
    Ruski
    You can now find more information for my post #44 (09/01/16) by Googling "Repairing Honeywell CM901 display fault"

    Les.
    Originally posted by Les Jones
    Magnificent solution - well done Les.

    But I'll stick to the hair dryer method

    Cheers

    Russ
    Perfection takes time: don't expect miracles in a day
    • aderowbotham
    • By aderowbotham 17th Feb 16, 8:27 PM
    • 1 Posts
    • 0 Thanks
    aderowbotham
    I have the same problem - LCD display segments are fading / failing by the week. And now the time +/- and temperature +/- buttons have stopped responding to presses. It was installed in 2012, so less than four years old.

    I have contacted Honeywell support but they say they can't help because I don't have proof of the installation date. This is unfortunately because the gas fitter who fitted our new boiler and heating system has died, so there's no way for me to get evidence of the installation.

    This is very annoying because I have given Honeywell the serial number – the serial presumably tells them how old the unit is, and yet they are unwilling to replace it. In other words Honeywell apparently think it's acceptable to sell a heating controller that lasts under four years and they won't do the right thing and just replace it.

    So...

    Can I buy a replacement remote controller from anywhere or do I have to buy the receiver unit with it?

    If the latter, can anyone recommend a different system / manufacturer? I'll have the bite the bullet and get someone to fit that for me. I'm not impressed AT ALL with Honeywell at the moment.
    • Ruski
    • By Ruski 18th Feb 16, 7:43 AM
    • 1,250 Posts
    • 712 Thanks
    Ruski
    If you have a screwdriver and a hair dryer try the fix first - it really does work!

    Not aware that you can buy the controller seperately, but I may be wrong, worth asking a local plumbers merchant.
    If not - then the new controller can be paired with the existing receiver and just keep new receiver as a spare...

    HTH

    Russ
    Perfection takes time: don't expect miracles in a day
    • Kirky2
    • By Kirky2 21st Apr 16, 7:00 PM
    • 1 Posts
    • 1 Thanks
    Kirky2
    Success!
    My CM927 was fitted 8 years ago, started playing up a few years ago and recently went altogether. A search on Internet found your post on this thread. Having a techi background decided to have a go. Used a thin book to support PEC and also wrapped LCD to protect from heat. First attempt using low heat made slightly better, but second attempt made it worse. I decided to try a higher heat setting and then after rubbing along length of contacts to improve connection then held ribbon down along length until it cooled. I also put a folded business card between LCD/backlight to support and pack slightly. Re-assembled - 100% working! Nice one Sir! Thank you!
    • ladymarmalade222
    • By ladymarmalade222 28th Jul 16, 11:36 AM
    • 565 Posts
    • 532 Thanks
    ladymarmalade222
    Excellent service from Honeywell.

    My thermostat lcd went faulty. It is around 4.5 years old so after reading this thread I contacted Honeywell. They requested pictures of the front and back of the unit and a scan of the receipt when fitted. Success! New unit arrived by UPS 2 days later. Asked to post back the faulty unit by freepost address.

    Great service unlike my tefal actigrill which stopped working after a year!

    Xxx
    • gwapenut
    • By gwapenut 29th Jul 16, 8:43 AM
    • 873 Posts
    • 364 Thanks
    gwapenut
    How faulty was the front? Mine has occasional LED segments missing but is still very readable.
    • ladymarmalade222
    • By ladymarmalade222 29th Jul 16, 9:40 AM
    • 565 Posts
    • 532 Thanks
    ladymarmalade222
    The display gradually lost bits of the LCD over a few weeks eventually making it unreadable.

    Xx
    • Ruski
    • By Ruski 1st Oct 16, 8:01 AM
    • 1,250 Posts
    • 712 Thanks
    Ruski
    Honeywell CM927 display fault again!

    Whilst the better Half is away on a girlie weekend, I 'borrowed' her hair dryer and fixed the display again...
    Before and after using the hairdryer and 10 minutes time...




    Becomes:



    HTH

    Russ
    Perfection takes time: don't expect miracles in a day
    • darloned
    • By darloned 6th Oct 16, 5:37 PM
    • 2 Posts
    • 0 Thanks
    darloned
    Honeywell CMS927B. re Readout disappearing in parts.
    Strip the unit and remove the circuit board (just a few plastic clips, no screws). Remove the LCD assembly from the circuit board (more plastic clips and an eight pin push connection). Removed the LCD unit from the clear plastic housing (more plastic clips). Finally heat up the plastic ribbon where it is stuck to the circuit board (hair dryer will do trick) and then firmly press it onto the circuit board... probably worth doing this several times; in effect you are remating the ribbon to the circuit board by softening the adhesive. Put it all back together and it should be working again.
    Originally posted by going_off_grid
    Many thanks.This saved me £120 . Very Grateful!!!
    Last edited by darloned; 06-10-2016 at 5:39 PM. Reason: title
    • FarleyFlavors
    • By FarleyFlavors 18th Oct 16, 3:04 PM
    • 31 Posts
    • 12 Thanks
    FarleyFlavors
    Put it all back together and it should be working again.
    Originally posted by going_off_grid
    Blimey! Had my doubts that this would work but it really does!

    My CM927 is eight years old and the LCD started to fail several years ago. It got to the stage where only around 20% of the display was readable. It still worked fine but reprogramming it became impossible.

    Followed these instructions and ten minutes later, after the first attempt, I've got everything bar two non-essential LCD elements back.

    Huge thanks to going_off_grid!
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