While you wait for answers, we may have found some information which could help you.
Click here for Change Battery Batteriescan i fix it honeywell st1000 ?
Replace a wireless termostat with a hard wired one?
how often do we change the3032 battery in a digistat +2rf?
Can you get just a new RDJ10RF thermostat or does it have to be the set?
Fan running continuously?
is there a way to just simply turn the temperature up?