Some programmers are a bit flaky, the ST9400 has had a problem or two over it's life but remains one of the easiest to use.
It is unrealistic to expect products to last forever and this unit you have could, if memory serves correctly, be up to 10 years old.
If it is under 5yrs old you might like to email Honeywell and ask if they can swap it out, as under EU law, products are meant to be fit for purpose and with items such as yours, 5yrs is generally considered to be fit.
It is unrealistic to expect products to last forever and this unit you have could, if memory serves correctly, be up to 10 years old.
If it is under 5yrs old you might like to email Honeywell and ask if they can swap it out, as under EU law, products are meant to be fit for purpose and with items such as yours, 5yrs is generally considered to be fit.