Issue with heat tape temps in rack...

[redshepherd]

Has the tape the same size and wattage on all the levels?

If it is try moving the probe and making sure it's well attached to the tape and possibly with some heat refracting tape to keep the temp stable.

There's always a bit of difference between levels. Extension cords are used on all professional racks and a surge protector AFTER the thermostat seems an overkill. Before is suggested tho.

Yes they are, they're 12" flexwatt.

I can't move the probe to a different shelf, because it sits in the recess in the pvc, below the heat tape.

Well, the biggest risk is fire of course. Especially with a overloaded extension cord. Remember that these simple extension cords internal diodes and structures wear out and become faulty. I was told they should be replaced annually. You are probably okay but i would look into at least a surge protector extension cord until you can really figure out something alternative. And thats easy , to replace the cord and it might even correct the issue.

I guess I'll get a new one and hope it fixes it. This 10 degree temp range is too crazy!

Any possibility the heat tapes are wired wrong? (however you do it)