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