The programmer is a Grasslin Towerchron QE2, purchased from B&Q some years ago. It will not run either a pre-set programme or own set programme, the display is ‘frozen’ and jumbled. It will not accept any effort to reset the day and time. Any ideas of what the problem may be? I am not technically minded.
Faulty central heating programmer
Mar 05, 2022
Last reply: 4 years ago
2 Replies
Most common problem on small LCD displays is not enough pressure on the edge connectors. If pressing the LCD toward the board unscrambles it, just need a spacer added (eg bit of card) to keep it connecting. Of course there will be live voltages in there so don't do this unless sufficiently expert.
Display jumbled and frozen might be just a contact issue with the LCD display itself iff the controller still worked and responded to button presses (or at least *some* button presses). If it has locked up then either the CPU or working memory is no longer reliable.
Failed electrolytic capacitors tend to cause this sort of fault 10 years or so from new (ISTR shorter MTBF for some dodgy batches around 2005). Official policy is no user serviceable parts inside and if you are not technically minded you are much safer just buying a new one.
Worth trying cycling the power a few times with progressively longer delays between switching it on again but if it doesn't recover by doing that then it is WEE scrap and you will need a new CH controller.
ie 10s delay, 1 min, 15 min, 1 hour (then scrap it if no go)
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