TP5000RF problem with programmes

[thunderpants1]

Good afternoon
We have a TP5000RF thermostat. We have programmed it to put on the heating at specific times during the day and night, however it keeps overiding these times and the heating comes on at random. Any advice would be gratefully appreciated

 

[adonis]

Is it due to this, from the user guide.

Option 34 - Select chrono-proportional cycle rate (DIL switch 5 set to Chrono) This allows the thermostat chrono-proportional cycle rate to be selected. It is only active if DIL switch 5 has been set to “Chrono”. Press + until Option 34 is displayed, use V and Λ to select required setting.

mine was doing it some years back and I think it was due to that, full instructions below.

https://cdn.expertelectrical.co.uk/media/catalog/product/t/p/tp5000si-instructions.pdf