Honeywell CM927 displays "Internal Error"

[pushbutton1]

Hi Everyone - newbie to the forum
I have had a new (?) CM927 Wireless Thermostat (purchased on FleaBay) working OK for about two weeks.
It now displays "internal Error" on the LoT display.
It also displays a flashing spanner icon.
It also shows the room temperature as minus 24 degrees!
Most other settings can still be altered/programmed OK.
Can this be reset and if so how?
Removing batteries has no effect.
Any help most welcome
Thanks

 

[twgas]

Have you tried puuting new batteries in it?

 

[pushbutton1]

Thanks for your response Mick
Yes - new batteries do not solve it.
It had only been "installed" for a couple of weeks before it failed like this

 

[mrgas]

Im afraid your unit is kaput!

 

[Boilerman2]

as reading -24c sounds like the internal thermistor is shot its not replaceable though so new unit - Check the warrenty you might be able to get a free one if less than a year old!

 

[pushbutton1]

Many thanks for your repies guys - much appreciated.
I guess I was unlucky this time!!!!!!!

 

[fliptopbin]

Having a similar problem with a Honeywell CM927.

Bought and installed it just over 2 years ago, and it worked really well until about 6 months ago when the batteries went flat. No bother, replaced the batteries, but they seemed to go flat very quickly too.

Had a situation where we came back from a few days away and the heating had clearly been on for days and the house was up to about 35 degrees

Had a similar problem with the heating sticking on - think it was a zone valve, BG guy came out and gave it a clean and it seems to be OK now.

Anyway, replaced the batteries again, and they have just gone flat again - within a month!

Just now I pulled the batteries and put them back in as it didn't seem to have clicked on and it was getting cold. It then told me the temp was -24 degrees!

A little playing about and now I have the spanner symbol and "internal error".

Is the thing really goosed then? I have to say that I am pretty unimpressed. Obviously it's not under warranty but can I just buy the controller? I really don't see why I should spend £100 on another unit, frankly 2 years doesn't seem a very impressive lifetime...

 

[D_Hailsham]

The CM927 are normally very reliable. I have had one for nearly six years and the only thing I have done is replace the batteries.

Although it is out of warranty, I would still get in touch with Honeywell as there may be a bad batch of them.

What make batteries are you fitting?

 

[fliptopbin]

Duracells.

Just firing off an email to Honeywell now.

If I have to I will pay for a replacement controller, but I'm not really up for blowing another £120 on the whole thing...

 

[fliptopbin]

Just firing off an email to Honeywell now.

...or at least I would if their website worked

 

[Tunwells2]

We have just had exactly the same problem, which started when we changed the batteries. Sounds like we need a new unit?

Has anyone challenged Honeywell and got a free out of warranty replacement, it's obviously a known error?

 

[Dan Robinson]

it's obviously a known error?

How so?

 

[fliptopbin]

I forgot to update this!

I contacted Honeywell and they posted me a new unit out FOC, despite it being well outside the warranty. Really excellent customer service.

 

[Agile]

Thats the advantage of dealing with a proper well known manufacturer!

They are often very helpful like that.

Pity the likes of Triton are just not interested!

 

[Tunwells2]

Thanks 'flip top'. Will give that a go too..