We recently had our old hot water cylinder removed and converted to continuous gas (LPG bottles).

As I understand it, when the first bottle runs out of gas it switches over to the second bottle automatically and the indicator turns red to let you know you need to order a bottle swap.

After 5 or 6 weeks I noticed that the indicator had turned red, OK first bottle must be empty right? Later the same day it was back to green. Next morning was red, that afternoon green again. Same the next day and the next.

Is this normal if a bottle is nearly empty?