this is not fail safe. with electronics, nothing is fail safe. BUT a very good system. one thing that should be said about doing it this way. I feel the secondary t-stat should be an off / on not proportional thermostat. when you start having different voltages with digital devices, you can have crazy things happening. one reason why spyder robotics has a warning about running their thermostats off of a generator. they need a pure clean power supply and even using reg household power, they should be wired thru a good surge surpressor. NEVER go cheap on a thermostat, if you can't afford a good thermostat then stay away from this type of hobby. not only can a malfunctioning thermostat burn your reptiles, it can also burn your house down and you might be in it. I'm not applying that the ve100 is a bad thermostat, I haven't done any research on it. kitedemon nice diagram, thanks donOriginally Posted by kitedemon
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Simple diagram for a failsafe system. If it isn't the probe it must be the VE100 there has been issues in the past with them resetting to a default setting after a power failure I am unsure what the default is but it might be something to check that the set point is still what you set.
If the ambient temps in the room are very cold it may effect the probe and drop it to a much lower temp disproportionally and force the rack to over heat to adjust the cold probe. I am just grasping at straws.
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