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The buttons on my Salus rt520tx thermostat seem to be doing nothing when I press them. Any suggestions ?

I did get one guy to look and he said "forget it get a new boiler."

It would sometimes fire again, but maybe once or twice. Then it would not do it again an was providing no heating or water. The plastic cover was removed to inspect it and it then worked fine. And carried on working!

It was sometimes cutting out after about 20 minutes of burning well.

My Profile 80e only fires up reliably with the plastic cover off. Why is this?