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.