Techman

WayneW, About what time did the all on occur? What hardware/firmware version of the PLM are you using? How many all on events have you had?, are they always in the evening hours?

and be sure to clear your java cache first and delete all applications in java

How many programs can effectively be run at ISY startup without overloading the ISY? Will they all be processed or is it possible that some could be skipped? If the programs are based on a time schedule will the time in the ISY, at startup, be synched prior to running the programs? I want to make sure necessary devices are put in the correct state in the event of a long duration power failure.

I'm still running 4.2.18 for a while so I won't be able to test your theory just yet.

When I look back I think I pressed the time button on the stat shortly before my temperature display in the ISY went blank. It finally populated again after there was about a 2 degree temp change.

I guess I spoke too soon, the thermostat with the external power supply just quit reporting temperature. The ISY current state temperature node is now blank. All the other fields are OK, set points, fan mode, and humidity. If I do a query it has no effect on any of the readings.

F.Y.I. I have one thermostat running on batteries and another with an external power supply. When I query them it has no effect on the display.

hart2hart, In that case you may want to try exchanging it. My 2441ZTH's have firmware v.0D. Not sure what firmware you have, but they may have made some changes which could be causing issues.

dougos2 and hart2hart, Have you tried removing the external power supply and running it only on batteries? Are you using the 2441ZTH as a stand alone product or is it a slave to another thermostat? Have you tried a factory reset?

Take a look at your error log to see if you have any HamWeather related entries.

What type of light bulb are you using?

I noticed that the are not building the device but will sell the plans. Maybe UDI should look into this.

What's the advantage/disadvantage of unchecking the "send cleanup messages" box?

This is a helpful article on troubleshooting Insteon signal problems. http://www.elavenue.com/insteon_test_data.html

You may be at the edge of the operating envelope for the thermostat. Take a look at the attached specs.

In the ISY at the bottom of the screen for the Keypad you find an option for adjusting the KPL led backlight. You can set the brightness for both the on and off levels.

You may have to add a resistor in series with the 5v supply. I had a similar issue, the resistor resolved it. Take a look at this post. http://forum.universal-devices.com/topic/8882-new-insteon-wireless-thermostat-2441zth-us/page-6?hl=resistor&do=findComment&comment=81700

If you're going to use them again next year why not disable the devices in the ISY then unplug them, The scenes and programs would remain intact.

Try removing power from both the PLM and the ISY then power up the PLM, wait 10 seconds then power up the ISY.

It's possible that the meter is interfering with the Insteon signal. Do you have any dual band devices and/or access points installed. If not you may want to add access points to improve the Insteon signal ( assuming that the 99i will support them)

In addition Paulbates's comment, have you recently added any new devices? The now discontinued 99i does not support some of the newer modules. The problem could also be caused by interference from electrical devices. Have you added any new electronics? Do you have any CFL bulbs, if so the ballasts sometimes go bad injecting noise into the power line which can interfere with the Insteon signal.

Possibly a bad XXX What is XXX?

k5map, If you want to adjust the on and off levels of the KPL backlight you could do it in program. This affects all the buttons on the KPL. This program dims the backlight at Sunset and brightens it at sunrise. If From Sunset To sunrise (next day) Then set 'KPL name' On 3 / Off 2 (Backlight level) Else Set 'KPL name' On 8 / Off 2 (Backlight level)

Mine shows a change as small as 1 degree. It's possible that there may be a delay in the thermostat reporting in order to prolong battery life.

If you're in the planning/building stage be sure to have your electrician install a neutral wire in each switch box as the Insteon dual band devices require both a hot lead and a neutral in addition to a ground.