Loud noises Our Rinnai Infinity 26 will be working fine, then suddenly start making loud noises in the middle of showering - they sound like high pitched scraping noises, like the music from the movie Psycho - you know, EEE EEE EEE. Turning the hot water tap up or down a little stops them. I called a plumber but naturally it wouldn't make the noises whilst he was here. It will make these noises almost every time we shower, then nothing for months, then they are back again. Even our neighbours are complaining. Any ideas?

Thanks for that snap101. The plumber that installed the system also installed the gas pipe and assured us that the size was correct. What did eventually work - so far anyway - was to turn down the water pressure from the mains. I think it was a build up of pressure due to the water efficient shower heads we have to use in Australia. Thanks for that snap101. The plumber that installed the system also installed the gas pipe and assured us that the size was correct. What did eventually work - so far anyway - was to turn down the water pressure from the mains. I think it was a build up of pressure due to the water efficient shower heads we have to use in Australia.

when i turn the hot water, my rtgh 9.5 makes a terrible noise and it shuts down displaying a code 13 when i turn the hot water, my rtgh 9.5 makes a terrible noise and it shuts down displaying a code 13