Honeywell CM927 control unit- LCD display issues LCD
 

The LCD display on the remote unit displays all symbols. I am unable to change/ alter the date, time or program. We haven't used the unit in a couple of months as had the heating turned off. While not in use the batteries were removed. I've tried a few sets of new batteries to no effect. The heating comes on, I'm assuming using the timings previously set. The heating also comes on when I switch it to manual. No matter what mode I select or buttons I press all symbols are displayed on the LCD screen. Please can anyone help as I can't replace the unit. I did try gently heating the unit on the radiator as I read somewhere it can get damp inside but still not fixed the problem. Thank you

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Honeywell CM927 control unit- LCD display issues LCD
 

On 28/09/2020 20:15, Voutt wrote:
The LCD display on the remote unit displays all symbols.Â* I am unable
toÂ* change/ alter the date, time or program. We haven't used the unit in
a couple of months as had the heating turned off. While not in use the
batteries were removed. I've tried a few sets of new batteries to no
effect. The heating comes on, I'm assuming using the timings previously
set. The heating also comes on when I switch it to manual. No matter
what mode I select or buttons I press all symbols are displayed on the
LCD screen. Please can anyone help as I can't replace the unit. I did
try gently heating the unit on the radiator as I readÂ* somewhere it can
get damp inside but still not fixed the problem. Thank you

Try this:

http://wiki.diyfaq.org.uk/index.php/...Screen_Failure




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Cheers,

John.

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Honeywell CM927 control unit- LCD display issues LCD
 

On Tue, 29 Sep 2020 00:52:30 +0100, John Rumm
wrote:

On 28/09/2020 20:15, Voutt wrote:
The LCD display on the remote unit displays all symbols.* I am unable
to* change/ alter the date, time or program. We haven't used the unit in
a couple of months as had the heating turned off. While not in use the
batteries were removed. I've tried a few sets of new batteries to no
effect. The heating comes on, I'm assuming using the timings previously
set. The heating also comes on when I switch it to manual. No matter
what mode I select or buttons I press all symbols are displayed on the
LCD screen. Please can anyone help as I can't replace the unit. I did
try gently heating the unit on the radiator as I read* somewhere it can
get damp inside but still not fixed the problem. Thank you

Try this:

http://wiki.diyfaq.org.uk/index.php/...Screen_Failure
Yes, I had that problem, and did that fix. Lasted about 6 months then
broke again. Same fix didn't work a second time, tried other
solutions, eventually trashed it and bought a very similar unit from
Plumebase, branded differently. Still working after 8 years.