Hi,

I had a report that ice was building up on an indoor cassette unit off a R407c Mitsubishi City Multi, this causing water leaks.

On further inspection of the outdoor condenser the bottom half of the accumulator along with the service valve area of the suction pipe was solid with ice!

My first port of call before trying anything else is to weigh out any remaining refrigerant charge as I'm thinking possible low on gas.

Would this be a good place to start and what causes the accumulator to frost over (in cooling) operations?

Many thanks.