Driver forces mode to HEAT when temperature drops below 5C

[gkostiuk]

Installed this driver when migrating from SmartThings several months ago, all fine until the temperature started getting colder. My application is in a vacation home where water lines are drained in winter, but I use the thermostats to preheat before I arrive.
I don't want to keep a minimum temperature of 5C as this wastes a huge amount of electricity. I purchased this Ki Zigbee stat specifically because it doesn't force a 5C minimum like other stats do.

Looking at the code around line 78, it looks like this is what is forcing temperature to 5C. I'm not very familiar with the code but for now attempted a fix by setting map.value = "--" instead of getTemperature ("01F4").
Hoping someone can validate this a being the correct solution or are there other changes required, thanks.