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Yeah, I can’t figure it out. I have reset the system but can’t get hold to work. No worries I have sent Secure an email.

The batteries are not replaceable

Yep, so I can get to that option but then can’t select hold for 1 hour, 2 hours, until cancelled etc.

Hello, I have a Secure H3747 and ptd setup to control a 2 heating zone and hot water system. All the wiring is fine and the unit is controlling the association zones. I have two wired nest thermostats and as such have set the h3747 to have wired thermostats on zones 2&4 (this is what is wired...