I have a dual flush toilet that flushes very well some of the time. However, about 50% of the time, when the toilet is flushed and then the hot water faucet is turned on, the hot water pressure dies to almost nothing.
When the toilet finishes filling, one of two things happens:
- there is sometimes a loud bang in the pipes and then the hot water pressure will return to normal instantly, or
- when the toilet finishes filling there will be no bang and no return of the hot water pressure until I go to another faucet in the house and wiggle it back and forth between hot and cold very quickly numerous times after which there will be a loud bang and a return of normal hot water pressure.
NOTE: This problem never affects cold water pressure. WHY??? Even our plumber cannot explain it.