The answer to 'repiping won't flush' is that a problem with the new plumbing system after a repiping job can prevent proper flushing and drainage. This is often caused by a clogged or improperly installed pipe, a problem with the new fixtures, or an issue with the water pressure or flow. Symptoms may include slow draining sinks, toilets that don't flush completely, or water backing up in the system.
To troubleshoot, start by checking for any clogs or obstructions in the new pipes. You can try using a plunger or drain snake to clear the blockage. If that doesn't work, the issue may be with the installation of the new plumbing system. In that case, it's best to call a professional plumber to inspect the work and make any necessary adjustments or repairs.