Amprobe IR-450-EUR displays error message when exposed to hot temperatures

[jancelot]

Had the Amprobe IR-450-EUR been sitting on my car's seat for a while, and couldn't use it to measure. Probably got too hot since the car was outside at noon in summer. The error message is "Et.H". Took a look at the user's manual, but no mention to any error. After a while of having it outside, worked properly as usual. Did somebody experience a similar situation or was aware of this? I'm a little bit disappointed the instructions manual didn't mention any troubleshooting codes, I just though I had broke the meter for good until luckily it started working again after cooling down.