Expired Certificate Locks Honeywell Generator's Clock in 2018
A new homeowner in the UK recently encountered a modern-age problem with their Honeywell 22 kW LP generator, which was equipped with a Sync 3 module. The engine itself was fine, but its smart monitoring system appeared to be stuck in 2018.
According to a Reddit post, the issue involved the Sync 3 module not connecting with Honeywell's remote monitoring app Mobile Link. The homeowner explained that 'I'm unable to connect to Mobile Link because the time is 3/28/2018.' They added that a packet capture showed 'the TLS handshake to time-prod.generaccloud.com is failing because the certificate on my Sync 3 is expired.'
Even after resetting the system, disconnecting battery power, and setting the clock manually, the problem returned once wireless access was restored. The thread's suggested fixes centered on either updating the controller or swapping out the WiFi hardware.