Ran vinegar flush through two Rinnai tankless water heaters in mop sink closet in men’s locker room, for 1hr each. Vinegar had blue color knowing we went through heat exchangers. Cleaned burner assemblies. Tested units and both working together as normal. Customer stated primary unit on right side was turning off, did not take down code, just turned off and on to get working again. Did not notice a code on arrival or after restarting and testing.
