Hi
I have a M90e 24S which works fine on the hot water side but for the central heating , fires up for a few seconds then shuts down. This is only just started happening. Any suggestions
If it worked properly a short while ago then either the diverter valve is jammed or failed, the DHW demand switch is jammed on, a sensor has failed or rarely the PCB has failed.
You may need to call a gas engineer unless you have the skills to try to repair it yourself.
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