(Case 00341378)
Hello Daniel,
There is not a thermal reset button on the PRM-20 Projector. If there is an issue with the projectors affecting their ability to function normally, we can be contacted either by an e-mail submission to our Promethean Knowledge base or by phone with the serial numbers of the projector or projectors in question and a description of the issue. For there we can verify warranty information and advise on steps that can be taken to troubleshoot that issue.