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How can I increase temp range on a DT20RF thermostat?

Thermostat only operates within the range 18-19 degrees meaning the max temp in the house is 19 degrees-too cold for my 85 years old mum. I can “trick” the thermostat by placing it somewhere cold. Can anyone suggest a solution.
Adrian, February 2018
Doesn't sound right

Manual may help or contact manufacturer.

https://www.worcester-bosch.co.uk/support/literature/download/release/8716106859/12785&ved=2ahUKEwi-kfO9u7DZAhWTe8AKHYfPDiAQFjAAegQICRAB&usg=AOvVaw2GdpET29jWh7POpTQJ5JXD

Whheehh, February 2018