While you wait for answers, we may have found some information which could help you.
Success
Message
Honeywell ST7100 programmer goes blank when RUN selected?
Replacing LP112 Programmer?
How do I reprogram my ideal bolier rf thermostat receiver?
Mid position valve?
can i fix it honeywell st1000 ?
Hot water but no central heating?
heating, Oil boiler not running?
Ideal Classic no heating but have hot water?
why has my wireless time clock stopped responding?
dmestic hot water near boiling point, howto adjust temperature?
isar he30?
Converting to Y Plan system?