Gas heating....Honeywell cm921...easy to replace??

[Missjoe]

hi, our timer screen has gone blank completely so cant set times temperatures date or anything!

Can this be replaced easily by us? Or do we need the gas engineers out?

Can we order replacement online..looks like this model is no longer available.

Thanks in advance!

 

[ShaunCorbs]

If you get the same one easy one or two screws /tab under / bottom edge of the receiver and it lifts off

Edit

If you can't find the same this should fit

Honeywell Digital Wireless 7 Day Programmable Thermostat CMT927 + Display CMT927A1049 | City Plumbing Supplies

 

[Harvest Fields]

Have you tried putting it into a bag of rice for 24hours? The blank screen is normally caused by moisture. Where is the stat located normally?

 

[Chuck]

You will need to follow the instructions to 'pair' the new programmer with your existing receiver box. Although they are normally sold as a pair, you can get just the programmer (as a 'spare') without the receiver and save yourself a few quid. The 'Evohome Shop' has a couple of CM927s available on special offer at the moment:

Honeywell CMS927B1049 Room Unit (Spare Part) - The EVOHOME Shop

and they are very helpful with advice.

[I've no affiliation with them, just a happy customer.]

 

[Missjoe]

Have you tried putting it into a bag of rice for 24hours? The blank screen is normally caused by moisture. Where is the stat located normally?

Normally sits on landing window sill

 

[Missjoe]

You will need to follow the instructions to 'pair' the new programmer with your existing receiver box. Although they are normally sold as a pair, you can get just the programmer (as a 'spare') without the receiver and save yourself a few quid. The 'Evohome Shop' has a couple of CM927s available on special offer at the moment:

Honeywell CMS927B1049 Room Unit (Spare Part) - The EVOHOME Shop

and they are very helpful with advice.

[I've no affiliation with them, just a happy customer.]

Thanks! That’s brilliant.

 

[Harvest Fields]

Normally sits on landing window sill

Do you get a lot of condensation on the glass?

 

[Missjoe]

Do you get a lot of condensation on the glass?

None. That’s the strange thing

 

[Harvest Fields]

Ok. However the window sill isn’t the best place for a room stat. If the sun comes directly through the window the stat will not regulate the temp properly.

 

[Missjoe]

The hall is the coolest room...is that the best room to locate the stat?

 

[Harvest Fields]

The hall is the coolest room...is that the best room to locate the stat?

Depends on how hot you like the rest of the house. If that is where the window sill is I would maybe move it to a telephone table/stand

 

[Murdoch]

Normally sits on landing window sill

Have you tried replacing the batteries?

 

[Missjoe]

Have you tried replacing the batteries?

Yip. Doesn’t make any difference

 

[Murdoch]

Yip. Doesn’t make any difference

Did you re pair it to the base station?

 

[Tom Leighton]

This may be too late now but did you have any battery acid leakage? I had the screen on mine no longer display anything after a leak. I opened up the thermostat to find that most of one of the pads connecting the batteries to the circuit board had eroded (assuming due to the acid).

I was able to easily fix this (albeit a temporary fix) using a small piece of foil between the circuit board and battery connector (making sure it doesn't touch anything else as you may cause a short). For a long term fix, solder is required.

 

[chris wilde]

hi, our timer screen has gone blank completely so cant set times temperatures date or anything!

Can this be replaced easily by us? Or do we need the gas engineers out?

Can we order replacement online..looks like this model is no longer available.

Thanks in advance!

Hello did you ever get this resolved, as we have the same problem. Thanks Chris

 

[ShaunCorbs]

Hello did you ever get this resolved, as we have the same problem. Thanks Chris

Need to change it common issue

 

[Murdoch]

Hello did you ever get this resolved, as we have the same problem. Thanks Chris

https://ensupport.getconnected.honeywellhome.com/s/article/What-is-the-direct-replacement-of-the-CM921-CM927-Programmable-Room-Thermostat?language=en_US

 

[Missjoe]

Had to get it replaced :-(