While you wait for answers, we may have found some information which could help you.
Click here for Heating Valve Systems
can i fix it honeywell st1000 ?
Tybox827reset?
is there a way to just simply turn the temperature up?
Fan running continuously?
Can you get just a new RDJ10RF thermostat or does it have to be the set?
How do I reprogram my ideal bolier rf thermostat receiver?