The heater malfunctioned causing carbon monoxide exposure to guests enjoying the pool.

@Tim Herman It feels like sometimes when you use the calculator through the iPad that you get a malfunction calculator because I redid it and everything about the calculator felt different and even functioned differently and the analysis was much different so maybe I just had a bug

We keep a lock box connected to the water spicket outside in case there is ever a malfunction with the key pad,  so if guests can't get in, I can send them the code to the lock box to use the key.

I have been looking at many connected devices that let you know, if there is a leak or if the sump pump is malfunctioning. 

He missed that some electrical outlets were malfunctioning, the plumbing in the shower was not working properly, the power box was old and outdated, the AC was not working, etc. - Don't be afraid to make sure everything works well and if it doesn't, don't be afraid to ask them to fix it or ask the seller for a credit.

I like the idea of them but I have found that many LEDs burn out or malfunction over time just the same as regular bulbs, which makes me a bit hesitant to install them.

Malfunctioning appliances, defective TV, broken washer/dryer are all their problem.

I would let her know you are willing to come by to see if there is a malfunction(assuming they are interconnected). 

I won't go into all of them, but the primary thing was that our kitchen cabinets were basically falling off the wall, the dishwasher stopped working after using it 3 times and the P-trap under the sink was malfunctioning, causing a constant water drip and massive hole under the sink - which they had covered up with a shelf and cleaning supplies.

I did consult with an attorney and they indicated that central A/C is not required in the state of California.I read through the lease and there is no clause that the tenant can leave due to a malfunctioning appliance or A/C.