how can i find the buffer tank in my dryer hotpoint tdc32?

my tumble dryer keeps tripping the circuit breaker when i switch it on, it works fine in my friends house i have cleaned the vents and even in behind them. I was told to check the little buffer tank at the back for the level sensor switch for the water tank level in case it is in need of a clean but i don't know what it looks like or where it is please help. Louise