Zephir ZRP9000CB Manual page 39

Indicates water tank full or
E2/E4
possibly the incorrect wiring
of plug
E3
Pipe temperature sensor
failed
User needs to pull out the rubber
stopper which is located at the bottom
of the unit, to drain the water away.
Check that the plug has been wired
correctly.
Replace pipe temperature sensor (the
unit can also work without
replacement.)