Resmed Airset 10 Autoset Water heating

I’ve had my Resmed for some time. It’s making noises which I’ve looked at resources to address, as well as taking it in for replacement parts. What concerns me and what I haven’t noticed before is the heating of the water in the reservoir unit. It gets hot on the bottom & water warm after adding fresh , which I do at least twice nightly. I’m concerned for my lungs. I don’t recall this being an issue before. I have a heated hose. I have obstructive issues leading to apnea. Untreated apnea led to AFIB, a pacemaker. My apnea is under control. Temp 78 , pressure relief on, humidity 5, climate control manual, smart start off, ramp time 20, set 12-14, but doctor hasn’t called me back to verify if the 12-14 setting was setting before it went in for repairs. Suggestions? Is the water supposed to heat up?

You're all over the place with your questions.

You probably don't need a setting of 5.... thats why you have to add water twice a day. I set mine on 1 with no congestion problems and the tank last three days sometimes less depending on if my heater runs more frequently then I up it to 2. If the plate is hot then you are having humidified air. Weird noises? You need another machine. Do you really need the ramp to be on? It helps you fall asleep before the pressure settings come in. Transition yourself before hitting the pillow for the night and you won't need the ramp setting. Melatonin, light doses, 1-3 MG not 10 unless you need it, if you can take it, check with your Dr first. Chamomile/lavander tea, and a light snack........ and eye shades.

It is normal for the bottom of the reservoir to get hot/warm. That is how the water is evaporated to control humidity. What model of a ResMed do you have?