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Tim JA
Tim JA, HVAC Technician
Category: HVAC
Satisfied Customers: 3262
Experience:  Owner at Self-employed
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My CM927 boiler is showing the wrong temperature and all my

Customer Question

My CM927 boiler is showing the wrong temperature and all my heaters have come on suddenly, tried changing the batteries but no success.
JA: What happened just before your boiler displayed this message?
Customer: Not sure it just stopped showing the correct temperature
JA: How long has this been going on with your boiler? What have you tried so far?
Customer: Just started today I tried changing the batteries
JA: Anything else we should know to help you best?
Customer: No
Submitted: 12 days ago.
Category: HVAC
Expert:  Tim JA replied 12 days ago.

Good evening, and welcome to the Technical section in Just Answer, an independent paid question and answer platform that matches customers' questions to experts in various skills. My name is ***** ***** I'll be happy to help you today.

I'm sorry to hear of your CM927 problem. This is a thermostat, not a boiler. If it has stopped displaying an accurate temperature then this suggest that is has developed a fault.  When an RF thermostat misbehaves, it can be a software problem, which you can resolve as below. If that doesn't resolve it, then the thermostat has a defect and you'll have to replace it. So, in case it's a glitch, please do the following:


1. Remove the batteries.
2. Turn off the power to the receiver.
3. Move the thermostat to be within 1 metre of the receiver.
4. Wait 10 minutes.
5. Power up the receiver.
6. Put brand new batteries in the thermostat.
7. If necessary, follow the re-binding procedure.

Customer: replied 12 days ago.
I am not able to find the receiver, I looked all over the house but I don’t know where it is is. This was already set up when I moved house.One question on this I am able to increase the temperature but the temp is from 0c to 9c I can’t change the number beyond 9c.
Customer: replied 12 days ago.
Is this some sort of setting which I can change as it’s not showing the correct thing for the room temperature.
Expert:  Tim JA replied 12 days ago.

If you're unable to proceed with step 3, you should still carry out steps 1, 2, and 4 through 7.

Customer: replied 12 days ago.
I don’t know where the receiver is I am
Not able to
Find it I think this thermostat does not have a receiver.
Expert:  Tim JA replied 12 days ago.

My apologies.  I meant that you should follow steps 1, 4, 6.

Customer: replied 12 days ago.
I followed all those steps and no change here is what it is showing
Expert:  Tim JA replied 12 days ago.

Between which two posts did you wait for 10 minutes?

Customer: replied 12 days ago.
If we want to fix or replace this is it an electrician we would need or is it a gas plumber?
Expert:  Tim JA replied 12 days ago.

It's not a gas related fault, so any competent heating engineer can help you.

Customer: replied 12 days ago.
what about an electrician?
Expert:  Tim JA replied 12 days ago.

I'm not sure why you would want an electrician to work on a heating system.

Customer: replied 12 days ago.
what kind of specialist do we need?
Expert:  Tim JA replied 12 days ago.

As I said, any competent heating engineer can help you.