harristl

Good advice from both of you. . .thanks very much! LeeG's comment about the thermostats being RF-only rang a bell for me. I have two Lamplincs that I use primarily as dual band repeaters. While both of them appeared to still be working, I relinked them both and. . .lo and behold. . .the thermostats both started responding again! They have been working fine again now for about a week, so I'm hoping the problem is solved. Thank you both very much for your help. Tori

I'm stumped and could use some suggestions on this one. . . I have two identical 2441th Thermostats that have worked fine with my ISY994i for approximately one year. Both suddenly stopped working. My ISY/PLM still work fine with a number of Insteon switches. Things I've tried (with no luck) include. . . - Updated flash on 994i to v4.2.18 (UI is the same version) - Removed both thermostats from all scenes - Performed factory reset on both 2441th - Attempted both auto discover and manual add of the thermostats. In both cases, the device is detected, but fails to add as shown in the diagnostics below. The popup error message is the dreaded "Cannot determine Insteon Engine." The PLM status shows 25.13.46v9B / Connected (which is as expected, since all of my Insteon Lamp Lincs, In-Line Lincs, and Toggle Lincs still working fine). Here are the diagnostics from an attempted auto discover. . .it's pretty much the same thing when you try to manually add. Fri 11/21/2014 07:14:01 PM : Start Insteon Device Linking Mode Fri 11/21/2014 07:14:01 PM : [LNK-BGN ] 02 64 01 00 06 Fri 11/21/2014 07:14:14 PM : [LNK-STAT ] 02 53 M(01) gid=00 29.25.E2 050B 0D Fri 11/21/2014 07:14:14 PM : [29.25.E2 00] Linked device type=05.0B fw=0D Fri 11/21/2014 07:14:14 PM : [29 25 E2 0 ] Added to list of devices to link to ISY Fri 11/21/2014 07:14:14 PM : [LNK-BGN ] 02 64 01 00 06 Fri 11/21/2014 07:14:24 PM : Stop Insteon Device Linking Mode, Final processing to follow Fri 11/21/2014 07:14:25 PM : [LNK-END ] 02 65 06 Fri 11/21/2014 07:14:25 PM : [std MH ] Unexpected Ack imCmd=65 cmd1= 0xE2 Fri 11/21/2014 07:14:25 PM : [iNST-TX-I1 ] 02 62 29 25 E2 0F 0D 00 Fri 11/21/2014 07:14:25 PM : [iNST-ACK ] 02 62 29.25.E2 0F 0D 00 06 (00) Fri 11/21/2014 07:14:34 PM : [iNST-TX-I1 ] 02 62 29 25 E2 0F 0D 00 Fri 11/21/2014 07:14:34 PM : [iNST-ACK ] 02 62 29.25.E2 0F 0D 00 06 (00) Fri 11/21/2014 07:14:43 PM : [iNST-TX-I1 ] 02 62 29 25 E2 0F 0D 00 Fri 11/21/2014 07:14:43 PM : [iNST-ACK ] 02 62 29.25.E2 0F 0D 00 06 (00) Fri 11/21/2014 07:14:47 PM : [29 25 E2 0 ] Failed to add device, reason 3 Fri 11/21/2014 07:14:47 PM : [All ] Writing 0 bytes to devices Fri 11/21/2014 07:14:47 PM : [All ] Writing 0 bytes to devices Any suggestions would be very much appreciated! Thanks, Tori