Hi, My honeywell ST9100A programmer has gone completely blank after I went on holidays and switched off the boiler, no lights, no display The keston C36 combi boiler seems to be working fine and the hot water is still working. Any help to troubleshoot the issue will be appreciated.
honeywell ST9100A programmer blank
- Thread starter sgdiy
- Start date
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The only thing I can advise you to check is that you have power to the timer by correctly checking with a multimeter.
Yes you do have to remove the programmer from its backplate to test at the terminals. Do you not have the manual? Instructions are there. There are two small screws underneath, loosen those and the front section hinges forward and off. Make sure you take all safety precautions when working with electrics.
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If you do not have the operating manual,go to:[http://www.plumbnation.co.uk/site/honeywell-st9100a-1-day-single-channel-programmer/] here you can download the manual which will give you a guide on how to set up in the installer mode.
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