Hello,
I have an old mechanical central heating control unit made by SMC. It has stopped working, the dial no longer goes round, so I cannot set the timer and also I cannot switch between hot water and central heating, as whichever setting I have the switch on I get both hot water and central heating.
I am signed up to the British Gas homecare service, and have called their engineer out, however he just told me that because it is over 7 years old I am not covered.
Knowing how much heating engineers etc cost, I am hoping to replace this unit myself with a modern, digital type timer/control unit.
Could anyone advise on whether this would be a sensible thing for me to attempt - I have done work on electrics before and have a sound understanding of them, however I kwno next to nothing about central heating systems and I have read that the wiring is different on the old mechanical control units to the new digital ones.
Also, would I be within the law/building regs to do this job myself, or do i have to get a qualified person in?
I can post photos of the old unit and wiring if this helps at all....
Any help or advice would be really useful pleaseeeeeeeeeeeeeee