Drazice digital water heater shows E5 and does not heat; sometimes accompanied by tripping of the circuit breaker.

Warning: This involves high voltage. Only proceed if you are competent with electrical testing. Otherwise, call a qualified technician.

Check the heating element:

• Turn OFF the breaker and verify no voltage at the heater terminal block.
• Remove the access cover and locate the heating flange terminals.
• Disconnect the wires from the heating element terminals.
• Measure resistance across the element terminals with a multimeter. Compare with the rated power (e.g., a 2 kW element at 230 V should be around 26 Ω). Infinite resistance indicates an open element; very low resistance may indicate a short.
• Measure insulation resistance between each element terminal and the metal flange/tank using a megohmmeter if available. Low insulation resistance indicates a ground fault.
• If the element is defective, drain the tank below the flange level, remove the flange, and replace the complete heating flange assembly with a Drazice OEM part, including new gasket.
• Inspect the power relay/triac on the control board for burn marks. If damaged, the control board should be replaced as a unit.
• Reconnect wiring firmly, refill and bleed the tank, then restore power and check for normal operation.