I have a Worcester 28i combi boiler with an attached Sunvic TLX thermostat
and things are working ok... but then not really.

The boiler is working fine. No problem.

The thermostat should turn heating on and off to keep room temperature
within a tight range. Mine doesn't. At the current setting the boiler
doesn't start heating until the temperature reached about 17 degrees and it
doesn't switch the boiler off until room temperature has reached about 27
degrees. The result is that I manually use the dial on the thermostat to
turn heating on and off. Less than ideal!

What should I do?

I hesitate to replace with another Sunvic TLX (or equivalent) as I fear the
same results. Somehow believe a digital thermostat would do a better job but
I don't know which are compatible with the Worcester 28i.

Thanks for any comments.

Can I just add...

The ideal solution would be a radio controlled thermostat as the current
position is not ideal. But this would require the Worcester 28i to be
compatible I suppose.... ? Is it possible?

"bobby" <(E-Mail Removed)> wrote in message
news:bq4fre$2r7$(E-Mail Removed)...
> I have a Worcester 28i combi boiler with an attached Sunvic TLX thermostat
> and things are working ok... but then not really.
>
> The boiler is working fine. No problem.
>
> The thermostat should turn heating on and off to keep room temperature
> within a tight range. Mine doesn't. At the current setting the boiler
> doesn't start heating until the temperature reached about 17 degrees and
it
> doesn't switch the boiler off until room temperature has reached about 27
> degrees. The result is that I manually use the dial on the thermostat to
> turn heating on and off. Less than ideal!
>
> What should I do?
>
> I hesitate to replace with another Sunvic TLX (or equivalent) as I fear
the
> same results. Somehow believe a digital thermostat would do a better job
but
> I don't know which are compatible with the Worcester 28i.
>
> Thanks for any comments.
>
>
>
>

I have the same boiler and recently fitted a Sunvic TLX stat also. I
like yourself found that the swing in temperature between on/off was too
great. I took it back and replaced it with a Drayton Digistat which is
much better the temperature now remains at a constant 22 degrees which I
have it set at after initial warm up and it does not overshoot during
initial the warm up also.

Marc

bobby wrote:
>
> I have a Worcester 28i combi boiler with an attached Sunvic TLX thermostat
> and things are working ok... but then not really.
>
> The boiler is working fine. No problem.
>
> The thermostat should turn heating on and off to keep room temperature
> within a tight range. Mine doesn't. At the current setting the boiler
> doesn't start heating until the temperature reached about 17 degrees and it
> doesn't switch the boiler off until room temperature has reached about 27
> degrees. The result is that I manually use the dial on the thermostat to
> turn heating on and off. Less than ideal!
>
> What should I do?
>
> I hesitate to replace with another Sunvic TLX (or equivalent) as I fear the
> same results. Somehow believe a digital thermostat would do a better job but
> I don't know which are compatible with the Worcester 28i.
>
> Thanks for any comments.

bobby wrote:
> Can I just add...
>
> The ideal solution would be a radio controlled thermostat as the
> current position is not ideal. But this would require the Worcester
> 28i to be compatible I suppose.... ? Is it possible?
>
I used a wireless CM67 digital programmable roomstat.
Excellent but not cheap, should work with any boiler.

Thanks for your comments Bill, Marc and Christian. Very useful.

"bobby" <(E-Mail Removed)> wrote in message
news:bq4fre$2r7$(E-Mail Removed)...
> I have a Worcester 28i combi boiler with an attached Sunvic TLX thermostat
> and things are working ok... but then not really.
>
> The boiler is working fine. No problem.
>
> The thermostat should turn heating on and off to keep room temperature
> within a tight range. Mine doesn't. At the current setting the boiler
> doesn't start heating until the temperature reached about 17 degrees and
it
> doesn't switch the boiler off until room temperature has reached about 27
> degrees. The result is that I manually use the dial on the thermostat to
> turn heating on and off. Less than ideal!
>
> What should I do?
>
> I hesitate to replace with another Sunvic TLX (or equivalent) as I fear
the
> same results. Somehow believe a digital thermostat would do a better job
but
> I don't know which are compatible with the Worcester 28i.
>
> Thanks for any comments.
>
>
>
>