We have a new boiler that was installed by a licensed professional but the system is unreliable. We have had several service calls for it since the install 3 years ago. It has run too hot and shut itself down during cold snaps one winter. We get the same error message at least once or twice a year saying sensor fault s1. I have to restart the system and it eventually clears. They have been out several times and once they had to replace the sensor but it still happens. Any suggestions?
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